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2. Analysis of Improvement in the Energy Efficiency of Office Buildings Based on Energy Performance Certificates.

Author

Bliūdžius, Raimondas, Banionis, Karolis, Monstvilas, Edmundas, Norvaišienė, Rosita, Adilova, Dinarr, Prozuments, Aleksejs, and Borodinecs, Anatolijs

Subjects
POWER resources, HOT water, SPACE heaters, THERMAL insulation, BUILDING performance, HEATING from central stations
Abstract

The article presents an analysis of changes in energy efficiency of new office buildings designed and constructed during the implementation period of the Energy Performance of Buildings Directive (2014–2024). Common criteria on energy efficiency were collected from Energy Performance Certificates (EPCs) and processed. The changes in final and primary energy for space heating, cooling and hot water production of certified office buildings were determined, and the improvements in buildings, their energy systems and energy sources were analysed. It was determined that buildings of Class C, designed between 2006 and 2017, showed an average thermal energy consumption for heating of 61, for cooling of 13 and for hot water production of 30 kWh/(m2·year), while buildings of Class A++, designed after 2020, consumed, respectively, 6, 9 and 17 kWh/(m2·year). The main reasons for these changes in energy consumption are the significant improvement of thermal insulation, increase of renewable energy in the heat supplied by district heating, the use of heat pumps for cooling, more efficient hot water boilers and optimized and insulated distribution pipelines. Even better results were hindered by the increased area of glazing, insufficient use of solar protection, users' preference for buildings of complex shape, and technically complicated electricity production. The results revealed that EPCs are an appropriate database for the analysis of changes in energy efficiency of buildings and for setting tasks for further improvement. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Performance of a direct-expansion solar-assisted heat pump for domestic hot water production in Algeria

Author

Sofiane Benchamma, Mohammed Missoum, and Nefissa Belkacem

Subjects
solar thermal energy, direct-expansion solar-assisted heat pump, hot water production, mathematical modelling, coefficient of performance, Renewable energy sources, TJ807-830
Abstract

The focus of this study is to investigate the energy performance of a direct-expansion solar-assisted heat pump water heating system (DX-SAHPWH). The system consists of an unglazed solar collector-evaporator, which can absorb heat from solar energy and air ambient simultaneously, a condenser in the form of a coil immersed in a hot water storage tank, a thermostatic expansion valve and a hermetic reciprocating compressor. The performance of the heat pump system is evaluated using a developed mathematical model under Matlab code. The modelling method is based on lumped and distributed parameter approach of different system components. Numerical calculations were carried-out to study the influence of different parameters, such as ambient temperature, solar radiation intensity and polytropic index on the system performance. Additionally, in order to evaluate the long-term system performance, the system’s model was applied on a case study of a single-family building located in Djelfa (Algeria), which represents the coldest arid region of the country. The results showed that the solar radiation intensity and ambient temperature have significant effects on the heat pump performance. A COP of 5.9 and a collector-evaporator efficiency of 1.9 were obtained at high solar radiation of 850 W/m2 resulting in lower heating time (29 min). In addition, results revealed that the system can operate even at lower ambient temperature due to its ability to take advantage of heat from the ambient air. The results from the case study gave a COP ranging from 2.3 to 3.8, which enhance the promising adoption of this system in domestic hot water production to respond to people daily life needs with clean, abundant and renewable energy.

Published
2024
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6. Analysis of Improvement in the Energy Efficiency of Office Buildings Based on Energy Performance Certificates

Author

Raimondas Bliūdžius, Karolis Banionis, Edmundas Monstvilas, Rosita Norvaišienė, Dinarr Adilova, Aleksejs Prozuments, and Anatolijs Borodinecs

Subjects
energy consumption, cooling demand, hot water production, energy performance certificate, office buildings, Building construction, TH1-9745
Abstract

The article presents an analysis of changes in energy efficiency of new office buildings designed and constructed during the implementation period of the Energy Performance of Buildings Directive (2014–2024). Common criteria on energy efficiency were collected from Energy Performance Certificates (EPCs) and processed. The changes in final and primary energy for space heating, cooling and hot water production of certified office buildings were determined, and the improvements in buildings, their energy systems and energy sources were analysed. It was determined that buildings of Class C, designed between 2006 and 2017, showed an average thermal energy consumption for heating of 61, for cooling of 13 and for hot water production of 30 kWh/(m2·year), while buildings of Class A++, designed after 2020, consumed, respectively, 6, 9 and 17 kWh/(m2·year). The main reasons for these changes in energy consumption are the significant improvement of thermal insulation, increase of renewable energy in the heat supplied by district heating, the use of heat pumps for cooling, more efficient hot water boilers and optimized and insulated distribution pipelines. Even better results were hindered by the increased area of glazing, insufficient use of solar protection, users’ preference for buildings of complex shape, and technically complicated electricity production. The results revealed that EPCs are an appropriate database for the analysis of changes in energy efficiency of buildings and for setting tasks for further improvement.

Published
2024
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7. Energy analysis of a direct expansion heat pump assisted by a thermal photovoltaic panel for hot water production in several regions of Brazil.

Author

Petrucci, Giovanni Augusto, Peñaranda Chenche, Luz Elena, Cardenas Gomez, Abdul Orlando, Jaramillo Loayza, David Mickely, Belman Flores, Juan Manuel, and Garcia Pabon, Juan Jose

Subjects
*RESIDENTIAL heating systems, *THERMAL expansion, *CLEAN energy, *HEAT pump efficiency, *THERMAL efficiency, *HEAT pumps, *SOLAR heating
Abstract

• Energy and economic evaluation of a PV-T/HP system for domestic hot water production in five different regions of Brazil. • The PV-T/HP Coefficient of Performance (COP) ranged from 7.5 to 2.5. • The PV-T/HP system showed a higher generation density [MWh/m2] compared to PV+TSC. • The lowest Levelized Cost of Heat (LCOH) for all scenarios evaluated was the PV+TSC system. This study focused on evaluating the energy performance and economic viability of a direct expansion photovoltaic-Thermal Heat Pump (PV-T/HP) system for residential heating applications in various regions of Brazil. A detailed mathematical model was implemented to compare the PV-T/HP system with other solar heating technologies, as photovoltaic with solar evacuated tubes collector (PV+TSC) and photovoltaic with electrical heat water (PV+EHW), analyzing key metrics such as electrical efficiency, thermal efficiency, and levelized cost of heat (LCOH). The study revealed variations ranging from 7.5 to 2.5 in the Coefficient of Performance (COP) of the heat pump under different solar irradiation and ambient temperature conditions, emphasizing the necessity for future optimization to enhance the system performance. Results indicated that cities with the lower ambient temperature such as Belo Horizonte and Porto Alegre exhibited favorable conditions for the PV-T/HP system, leading to increased energy generation and positive net electricity production. The study highlighted the need for tailored strategies to control system operations, limit compressor consumption, and improve overall efficiency. These findings contribute to the understanding of PV-T/HP systems in residential heating applications, showcasing their potential for sustainable energy solutions in Brazil. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Experimental and numerical analysis of a helical coil heat exchanger for domestic refrigerator and water heating.

Author

Missaoui, Sami, Driss, Zied, Slama, Romdhane Ben, and Chaouachi, Bechir

Subjects
*HYDRONICS, *HEAT exchangers, *HEAT transfer coefficient, *NUMERICAL analysis, *HEAT transfer, *SUSTAINABLE design, *HELICES (Algebraic topology)
Abstract

Helical condenser coiled tube is widely used in refrigeration machines for water heating due to its higher heat transfer, compact structure, high energy efficiency, ease of manufacture and arrangement. In addition, developing and optimizing the helical condenser coil designs are considered a sustainable solution for improving the performance of the system. Based on this vision, a particular difference of this study with other studies performed on similar researches is the influence of different shapes of condenser coil designs on heat transfer and temperature distribution during heating process. Therefore, the main objective of this paper is to improve the thermal performance of a helical coil by modifying the coil shape. Based on the results, the average heat transfer coefficient and average COP of variable pitch coil were increased by 36.48% and 16.17%, respectively, compared with normal coil. Moreover, the obtained results indicated that the water temperature, the water velocity, the heat transfer and the performance of the helical condenser with variable pitch coil were improved in comparison with that of normal coil. However, this investigation could provide some guidance to obtain the optimum coil structure of refrigeration machines for domestic hot water production. [ABSTRACT FROM AUTHOR]

Published
2022
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9. DESIGN, CONSTRUCTION, AND TESTING OF A PARABOLIC TROUGH SOLAR CONCENTRATOR SYSTEM FOR HOT WATER AND MODERATE TEMPERATURE STEAM GENERATION

Author

Mohammed H. Abbood, Raoof M. Radhi, and Ahmed A. Shaheed

Subjects
Concentrated solar energy, parabolic trough concentrator, hot water production, moderate temperature steam production, collector thermal efficiency, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Three parabolic trough collectors, with its two axes sun manual tracking system were designed, constructed, and operated in order to generate hot water and moderate temperature steam. An experimental investigation for testing the performance of a PTC is presented. The tests have been carried out in NAJAF climatic conditions (32.02 N, 44.33 E) during selective days of August. The thermal performance of PTC evaluated according to the Standard ASHRAE 93-1986 (RA 91) and the efficiency curve for the PTC was estimated. In the performance analysis of the PTC array, the effects of collector inlet temperature, ambient conditions, two cases for glass receiver and the variation in mass flow rate of the working fluid were investigated. A peak efficiencies close to (50% and 18.8%) were obtained for solar collectors with evacuated and non-evacuated glass receiver respectively at higher flow rate. The collector efficiency equation that is obtained in the present work agrees with other researches.

Published
2018
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10. Numerical model of intermittent solar hot water production.

Author

Gambade, Julien, Noël, Hervé, Glouannec, Patrick, and Magueresse, Anthony

Subjects
*HOT water, *HOT-water supply, *POWER resources, *SOLAR collectors, *ENERGY consumption, *SOLAR thermal energy, *SOLAR water heaters
Abstract

A dynamic numerical model of a solar thermal installation is developed. The aim of the installation is to supply hot water (over 80 °C) twice a day to a veal calf farm. It consists of 16 evacuated tubes solar water heaters associated to an unpressurised tank using the thermosiphon effect. The particularity of the installation is its layout, which alternates between solar collectors connected in series and those connected in parallel. This arrangement allows both pre-heating and storage of hot water. The solar installation contributed by 60% to the energy demand during a production cycle. The model was developed on TRNSYS 18 based on existing types adapted to the configuration of the system. The modelling of the solar installation was achieved in order to simulate the energy supplied. The calibration and validation of the model are presented in this paper. The first step is to carry out a sensitivity analysis using the Morris screening method to identify the most influential model parameters. The second step is an optimisation method used to minimize the difference between the simulated and measured energy to determine the influent parameters values. Finally, the model is compared with measurements during two periods with different meteorological conditions. [ABSTRACT FROM AUTHOR]

Published
2023
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11. Uporaba tople odpadne vode za ogrevanje sveže sanitarne vode

Author

Kavčič, Mitja and Stritih, Uroš

Subjects
priprava tople vode, toplota, udc:502.174:628.6(043.2), izkoriščanje toplote odpadne vode, energetska učinkovitost, water heat recovery, heat, rekuperacija vode, hot water production, grelno število, using waste water heat, energy efficiency, Coefficient of Performance
Abstract

Priprava tople sanitarne vode v povprečnem gospodinjstvu predstavlja približno 10 % vseh energijskih potreb. Gre za proces, ki se dnevno dogaja v vsakem stanovanjskem in tudi nestanovanjskem objektu, za zagotavljanje človekovega udobja. Toplo vodo se porablja za namene kuhanja, pranja perila, pomivanja posode, umivanja, prhanja ali pa kopanja. Vsa količina tople vode se po uporabi izlije v kanalizacijski sistem, s tem pa poleg vode zavržemo tudi vso toploto, ki je v njej še akumulirana. Z uporabo sistema za ponovno uporabo toplote odpadne tople vode se ta shranjuje v rezervoarju, iz katerega s pomočjo namenske toplotne črpalke črpamo toplotno energijo in jo uporabimo za ogrevanje sveže sanitarne vode. Odpadna topla voda se pred izlitjem v kanalizacijski sistem posledično ohladi, s pridobljeno količino toplote pa deloma ogrejemo svežo sanitarno vodo. Vodo je potrebno na željeno temperaturo le še dogrevati. Delež ponovno izkoriščene toplote za uporabnika predstavlja prihranke energije. V primeru uporabe sistema za ponovno uporabo toplote odpadne vode lahko prihranimo tudi do 50 % porabljenega energenta. V diplomski nalogi smo na primeru Fakultete za Šport Univerze v Ljubljani izračunali prihranke energenta v primeru vgradnje sistema za ponovno uporabo toplote odpadne vode, s katerim bi ogrevali svežo bazensko vodo in sanitarno vodo za potrebe tušev v bazenskem kompleksu. The preparation of hot sanitary water in an average household represents approximately 10 % of all energy needs. It is a process that takes place every day in every residential and also non-residential facility to ensure human comfort. Hot water is used for cooking, laundry, dishwashing, washing, showering or bathing. After use, the entire amount of hot water is poured into the sewage system, thereby throwing away not only the water but also all the heat that is still accumulated in it. By using a system for reusing the heat of waste hot water, the water is stored in a tank, from which thermal energy is extracted with the help of a dedicated heat pump. The heat is then used to heat fresh sanitary water. The hot waste water is cooled to a lower temperature before being poured into the sewage system, and the fresh sanitary water is partially heated with the same amount of heat. The portion of heat that is reused represents energy savings for the user. The water just needs to be heated to the desired temperature. Energy savings for the preparation of hot sanitary water in the case of using a waste water heat reuse system can be up to 50 %. In the diploma thesis, we calculated energy savings in the case of the installation of a waste water heat reuse system, which would be used to heat fresh pool water and sanitary water for the needs of showers in the pool complex, using the example of the Faculty of Sports of the University of Ljubljana.

Published
2022

12. Experimental characterization of the coupling and heating performance of a CO2 water-to-water heat pump and a water storage tank for domestic hot water production system

Author

Universidad Politécnica de Cartagena, Sánchez Velasco, Francisco Javier, Haddouche, Mohammed Reda, Illán Gómez, Fernando, García Cascales, José Ramón, Universidad Politécnica de Cartagena, Sánchez Velasco, Francisco Javier, Haddouche, Mohammed Reda, Illán Gómez, Fernando, and García Cascales, José Ramón

Abstract

This work presents an experimental study of the dynamic performance of a CO2 water-to-water heat pump in a domestic hot water production system. A facility was developed and used to characterize the time evolution of the COP of this heat pump, the heating and stratification processes of the hot-water storage tank, and the global COP of the system. Results showed that, when heating the water storage tank, strategies based on promoting stratification to reach Ri ∼40, such as the use of vertical tank filling velocities ∼ 10-4 m·s−1 with low water flow rates between the tank and the heat pump gas cooler, permits an increase of ∼12.4% in the system global COP and a reduction of ∼16% of the compressor energy consumption compared to other strategies. However, strategies based on considering higher water flow rates (i.e. Ri ∼1) increase the thermal energy available in the tank (∼6% when flow rate and increases a factor 3.6) but enhance the water mixing and extend the heating time which reduces the global COP of the system. Besides, an increase of the evaporator inlet water temperature from 5 °C to 20 °C increases the system global COP by 59% and reduces the heating time ∼40%.

Published
2022

13. DESIGN, CONSTRUCTION, AND TESTING OF A PARABOLIC TROUGH SOLAR CONCENTRATOR SYSTEM FOR HOT WATER AND MODERATE TEMPERATURE STEAM GENERATION.

Author

Abbood, Mohammed H., Radhi, Raoof M., and Shaheed, Ahmed A.

Subjects
SOLAR concentrators, PARABOLIC troughs, STEAM generators, THERMAL efficiency, WORKING fluids
Abstract

Copyright of Kufa Journal of Engineering is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2018
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14. Experimental characterization of the coupling and heating performance of a CO2 water-to-water heat pump and a water storage tank for domestic hot water production system

Author

Sánchez Velasco, Francisco Javier, Haddouche, Mohammed Reda, Illán Gómez, Fernando, García Cascales, José Ramón, and Universidad Politécnica de Cartagena

Subjects
Heat pump, 3309.95 Transmisión de Calor en Refrigeración y Calefacción, Mechanical Engineering, Hot water production, CO2, Building and Construction, Electrical and Electronic Engineering, Storage tank, Mecánica de Fluidos, 2204.04 Mecánica de Fluidos, Civil and Structural Engineering
Abstract

This work presents an experimental study of the dynamic performance of a CO2 water-to-water heat pump in a domestic hot water production system. A facility was developed and used to characterize the time evolution of the COP of this heat pump, the heating and stratification processes of the hot-water storage tank, and the global COP of the system. Results showed that, when heating the water storage tank, strategies based on promoting stratification to reach Ri ∼40, such as the use of vertical tank filling velocities ∼ 10-4 m·s−1 with low water flow rates between the tank and the heat pump gas cooler, permits an increase of ∼12.4% in the system global COP and a reduction of ∼16% of the compressor energy consumption compared to other strategies. However, strategies based on considering higher water flow rates (i.e. Ri ∼1) increase the thermal energy available in the tank (∼6% when flow rate and increases a factor 3.6) but enhance the water mixing and extend the heating time which reduces the global COP of the system. Besides, an increase of the evaporator inlet water temperature from 5 °C to 20 °C increases the system global COP by 59% and reduces the heating time ∼40%. This work has been performed in the context of the project in the project “Maximisation of the efficiency and minimisation of the environmental impact of heap pumps for the decarbonisation of heating and domestic hot water production in nearly zero energy buildings” ENE2017- 83665-C2-2-P, Funded by the Ministry of Economy and Competitiveness, Spain and the support of the European Regional Development Fund. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Published
2022
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15. The Energy Efficiency of Hot Water Production by Gas Water Heaters with a Combustion Chamber Sealed with Respect to the Room.

Author

Czerski, Grzegorz and Strugała, Andrzej

Subjects
GAS water heaters, HOT-water supply, HOME energy use, ENERGY consumption of buildings, COMBUSTION chambers, EQUIPMENT & supplies
Abstract

This paper presents investigative results of the energy efficiency of hot water production for sanitary uses by means of gas-fired water heaters with the combustion chamber sealed with respect to the room in single-family houses and multi-story buildings. Additionally, calculations were made of the influence of pre-heating the air for combustion in the chimney and air supply system on the energy efficiency of hot water production. CFD (Computational Fluid Dynamics) software was used for calculation of the heat exchange in this kind of system. The studies and calculations have shown that the use of gas water heaters with a combustion chamber sealed with respect to the room significantly increases the efficiency of hot water production when compared to traditional heaters. It has also been proven that the pre-heating of combustion air in concentric chimney and air supply ducts essentially improves the energy efficiency of gas appliances for hot water production. [ABSTRACT FROM AUTHOR]

Published
2014
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16. Design of an ORC system operating with solar heat and producing sanitary hot water.

Author

Ksayer, E. Bou Lawz

Subjects
RANKINE cycle, SOLAR heating, HOT water, ELECTRIC power production, DWELLINGS, PHOTOVOLTAIC power generation, TEMPERATURE
Abstract

Abstract: Organic Rankine Cycle (ORC) is useful to generate electricity from low temperature sources such solar heat (<120°C). An ORC system, working with R-245a, is presented and analyzed. The system provides the required electric power and the required hot sanitary water of a typical dwelling during one day (24hours). The system operates between a cold source of 25°C and a hot source: water at 120°C in solar hours, when solar flux is available, and between a cold source of 15°C and a hot source: water at 98°C coming from the accumulation tank in no-solar hours (morning, evening, and night). The maximum generated electric power is 2000W, and the used daily hot water is 200 l at 60°C. The required surface of the solar heater is 100 m2 assuming 8 solar hours per day and a mean solar flux of 400W/m2. The advantages of the ORC system are the electricity generation, the hot water production and the low cost compared to photovoltaic electric power generation. [Copyright &y& Elsevier]

Published
2011
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17. DESIGN OF A DUAL SYSTEM FOR HOT WATER PRODUCTION AND COOLING USING AN EJECTOR.

Author

Al-Dabbagh, Mohammad S.Q.

Subjects
*HOT water, *EJECTOR pumps, *MATHEMATICAL models, *WATER as a working fluid, *REFRIGERANTS
Abstract

This research deals with making a mathematical model for the design of a dual system for hot water production for industrial purposes as well as cooling using an ejector at a determined operating conditions, by utilizing dissipated thermal energy from a steam boiler and for a cooling capacity of (15) KW. For the system simulation, mathematical relations were presented for each component which were then combined together and programmed using (matlab) version 6.5 to optimize the system performance and design the components at this situation, using refrigerant (R-123) as the working fluid because of it's good characteristics and relatively high efficiency after a comparison study with other suitable refrigerants to be used for this system. Satisfactory results were obtained having good agreement with previous researches and a COP value of (0.667). The results show a suitable size of the designed system such that it can be used in a wide range of cooling and hot water production purposes. Also, the effect of operating conditions variation on the quantity and temperature of hot water and system performance were studied. [ABSTRACT FROM AUTHOR]

Published
2011

18. DESIGN, CONSTRUCTION, AND TESTING OF A PARABOLIC TROUGH SOLAR CONCENTRATOR SYSTEM FOR HOT WATER AND MODERATE TEMPERATURE STEAM GENERATION

Author

Ahmed A. Shaheed, Raoof M. Radhi, and Mohammed H. Abbood

Subjects
Work (thermodynamics), Materials science, 020209 energy, Nuclear engineering, 02 engineering and technology, General Medicine, Moderate temperature, Volumetric flow rate, Concentrated solar energy, lcsh:TA1-2040, parabolic trough concentrator, Thermal, 0202 electrical engineering, electronic engineering, information engineering, ASHRAE 90.1, Parabolic trough, Mass flow rate, Working fluid, collector thermal efficiency, hot water production, lcsh:Engineering (General). Civil engineering (General), moderate temperature steam production
Abstract

Three parabolic trough collectors, with its two axes sun manual tracking system were designed, constructed, and operated in order to generate hot water and moderate temperature steam. An experimental investigation for testing the performance of a PTC is presented. The tests have been carried out in NAJAF climatic conditions (32.02º N, 44.33º E) during selective days of August. The thermal performance of PTC evaluated according to the Standard ASHRAE 93-1986 (RA 91) and the efficiency curve for the PTC was estimated. In the performance analysis of the PTC array, the effects of collector inlet temperature, ambient conditions, two cases for glass receiver and the variation in mass flow rate of the working fluid were investigated. The tests were performed by collecting the data the outdoor measurements to evaluate the instantaneous thermal efficiency for PTC. A peak efficiencies close to (50%, 18.8%) were obtained for solar collectors with evacuated and non-evacuated glass receiver respectively at higher flow rate. The collector efficiency equation that is obtained in the present work agrees with other researches.

Published
2018

19. Study on performance of solar assisted air source heat pump systems for hot water production in Hong Kong

Author

Li, Hong and Yang, Hongxing

Subjects
*PERFORMANCE evaluation, *SOLAR energy, *HEAT pumps, *HOT water, *MATHEMATICAL models, *TEMPERATURE effect
Abstract

Abstract: This paper reports the investigation results on application of the solar assisted air source heat pump systems for hot water production in Hong Kong. A mathematical model of the system is developed to predict its operating performance under specified weather conditions. The optimum flow rate from the load water tank to the condenser is proposed considering both the appropriate outlet water temperature and system performance. The effect of various parameters, including circulation flow rate, solar collector area, tilt angle of solar collector array and initial water temperature in the preheating solar tank is investigated, and the results show that the system performance is governed strongly by the change of circulation flow rate, solar collector area and initial water temperature in the preheating solar tank. [Copyright &y& Elsevier]

Published
2010
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20. Investigating the real situation of Greek solar water heating market

Author

Kaldellis, J.K., Kavadias, K.A., and Spyropoulos, G.

Subjects
*SOLAR heating, *FOSSIL fuels, *RENEWABLE energy sources, *ENERGY industries
Abstract

Abstract: Solar thermal applications have been acknowledged among the leading alternative solutions endeavouring to face the uncontrollable oil price variations, the gradual depletion of fossil fuel reserves and the chain environmental consequences caused by its excessive usage. Almost 30 years after the initial emergence of the commercial domestic solar water heating system (DSWHS) in the European market, the corresponding technology is qualified as quite mature. On top of this, the European Commission expects that 100,000,000 m2 of solar collectors are to be installed in Europe by the year 2010 to facilitate durable and environment-friendly heat. In this context, the Greek DSWHSs market is highly developed worldwide, having a great experience in this major energy market segment. The present study is devoted to an extensive evaluation of the local DSWHSs market, including a discerning analysis of its time variation, taking seriously into account the corresponding annual replacement rate. Accordingly, the crucial techno-economic reasons, limiting the DSWHSs penetration in the local heat production market, are summarized and elaborated. Subsequently, the national policy measures—aiming to support the DSWHSs in the course of time—are cited, in comparison with those applied in other European countries. Next, the financial attractiveness of a DSWHS for Greek citizens is examined in the local socio-economic environment. The present work is integrated by reciting the prospects and mustering certain proposals that, if applied, could stimulate the local market. As a general comment, the outlook for penetration of new DSWHSs in the local market is rather grim, as the current techno-economic situation of solar heat cannot compete with oil and natural gas heat production, unless the remarkable social and environmental benefits of solar energy are seriously considered. Hence, the Greek State lacks stimulus to further DSWHSs installations, being strongly in support of the imported natural gas. As a result, the future of domestic solar thermal market and the survival possibilities of the local manufacturers are at stake. [Copyright &y& Elsevier]

Published
2005
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21. Simplification of process integration studies in intermediate size industries

Author

Dalsgård, Henrik, Maagøe Petersen, Peter, and Qvale, Bjørn

Subjects
*ENERGY conservation, *INDUSTRIAL engineering
Abstract

It can be argued that the largest potential for energy savings based on process integration is in the intermediate size industry. But this is also the industrial scale in which it is most difficult to make the introduction of energy saving measures economically interesting.The reasons are that the required engineering effort is too great and therefore too expensive, and that the resulting systems designs often become inordinately complex and therefore not attractive in operation.The present study describes steps that aim at reducing the magnitude of the theoretical work and engineering effort associated with a given process integration study in an intermediate size industry. This is based on the observation that the systems that eventually result from a process integration project and that are economically and operationally most interesting are also quite simple.Four steps that may be used separately or in series ahead of or simultaneously with the conventional process integration procedures (for example, the pinch point method) are described and are applied to an industrial case study.It might be feared that the use of preselections and groupings would limit the “freedom of movement” and therefore lead to non-optimal economic solutions, which may be right. But the objective of the optimisation is not to reach the best economic solution, but to relatively quickly develop the design of a simple and operationally friendly network without losing too much energy saving potential. [Copyright &y& Elsevier]

Published
2002

22. Estudio de implantación de un sistema de recuperación energética de calor residual para la reducción del consumo de gas en la producción de agua caliente en las instalaciones de Mercavalencia

Author

Calatayud Martí, Pilar

Subjects
Intercambiador, Heat pump, Eficiencia energética, Energy efficiency, Boiler, Máster Universitario en Ingeniería Industrial-Màster Universitari en Enginyeria Industrial, Bomba de calor, Exchanger, Hot water production, MAQUINAS Y MOTORES TERMICOS, Producción de agua caliente, Caldera
Abstract

[ES] El presente estudio tiene como objetivo la optimización energética en el proceso de producción de agua caliente en la empresa valenciana Mercavalencia S.A., logrando con ello una reducción de consumos y costes. Se procederá pues a la propuesta y valoración de diferentes alternativas de mejora de la eficiencia energética. El proceso actual de producción de agua caliente en la empresa se realiza mediante una caldera cuyo combustible es el gas natural. Es por ello que las distintas medidas se centrarán en la disminución del consumo de este combustible, conllevando a un ahorro económico y una menor contribución al efecto invernadero. Entre las posibles medidas se propone la sustitución de la caldera por una bomba de calor y la recuperación de calor residual de diferentes procesos., [EN] The aim of the present study is the energetic optimization of the hot water production in Mercavalencia S.A., reaching a reduction of consumption and costs. Different proposals for improvement of energy efficiency will be raised and analysed. The existing way to produce hot water in that company is by using a steam boiler which runs with natural gas. For this reason, the different solutions will focus on reducing the consumption of this fuel, which leads to an economic saving and a lower greenhouse effect. The raised solutions include replacing the steam boiler with a heat pump and recovering residual heat from different processes.

Published
2019

23. Estudio de implantación de un sistema de recuperación energética de calor residual para la reducción del consumo de gas en la producción de agua caliente en las instalaciones de Mercavalencia

Author

Gonzálvez Maciá, José, Navarro Peris, Emilio, Universitat Politècnica de València. Departamento de Termodinámica Aplicada - Departament de Termodinàmica Aplicada, Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials, Calatayud Martí, Pilar, Gonzálvez Maciá, José, Navarro Peris, Emilio, Universitat Politècnica de València. Departamento de Termodinámica Aplicada - Departament de Termodinàmica Aplicada, Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials, and Calatayud Martí, Pilar

Abstract

[ES] El presente estudio tiene como objetivo la optimización energética en el proceso de producción de agua caliente en la empresa valenciana Mercavalencia S.A., logrando con ello una reducción de consumos y costes. Se procederá pues a la propuesta y valoración de diferentes alternativas de mejora de la eficiencia energética. El proceso actual de producción de agua caliente en la empresa se realiza mediante una caldera cuyo combustible es el gas natural. Es por ello que las distintas medidas se centrarán en la disminución del consumo de este combustible, conllevando a un ahorro económico y una menor contribución al efecto invernadero. Entre las posibles medidas se propone la sustitución de la caldera por una bomba de calor y la recuperación de calor residual de diferentes procesos., [EN] The aim of the present study is the energetic optimization of the hot water production in Mercavalencia S.A., reaching a reduction of consumption and costs. Different proposals for improvement of energy efficiency will be raised and analysed. The existing way to produce hot water in that company is by using a steam boiler which runs with natural gas. For this reason, the different solutions will focus on reducing the consumption of this fuel, which leads to an economic saving and a lower greenhouse effect. The raised solutions include replacing the steam boiler with a heat pump and recovering residual heat from different processes.

Published
2019

24. The Energy Efficiency of Hot Water Production by Gas Water Heaters with a Combustion Chamber Sealed with Respect to the Room

Author

Grzegorz Czerski and Andrzej Strugała

Subjects
Engineering, lcsh:TD201-500, lcsh:Hydraulic engineering, Waste management, business.industry, Geography, Planning and Development, Aquatic Science, Computational fluid dynamics, Combustion, energy efficiency, gas-fired water heaters, hot water production, Biochemistry, Water production, Storage water heater, lcsh:Water supply for domestic and industrial purposes, lcsh:TC1-978, Heat exchanger, Chimney, Combustion chamber, business, Water Science and Technology, Efficient energy use
Abstract

This paper presents investigative results of the energy efficiency of hot water production for sanitary uses by means of gas-fired water heaters with the combustion chamber sealed with respect to the room in single-family houses and multi-story buildings. Additionally, calculations were made of the influence of pre-heating the air for combustion in the chimney and air supply system on the energy efficiency of hot water production. CFD (Computational Fluid Dynamics) software was used for calculation of the heat exchange in this kind of system. The studies and calculations have shown that the use of gas water heaters with a combustion chamber sealed with respect to the room significantly increases the efficiency of hot water production when compared to traditional heaters. It has also been proven that the pre-heating of combustion air in concentric chimney and air supply ducts essentially improves the energy efficiency of gas appliances for hot water production.

Published
2014

25. Design of an ORC system operating with solar heat and producing sanitary hot water

Author

E. Bou Lawz Ksayer, CEP/Paris, Centre Énergétique et Procédés (CEP), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-MINES ParisTech - École nationale supérieure des mines de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)

Subjects
Engineering, Hot-water production, Mathematics::Number Theory, 020209 energy, Hot water, Organic Rankine cycles, 02 engineering and technology, 7. Clean energy, 01 natural sciences, Storage water heater, solar heater, [SPI.ENERG]Engineering Sciences [physics]/domain_spi.energ, Energy(all), 0202 electrical engineering, electronic engineering, information engineering, Low temperatures, Low costs, Electricity generation, Organic Rankine cycle, Waste management, business.industry, Solar heat, Generate electricity, Electric power, 010406 physical chemistry, 0104 chemical sciences, 13. Climate action, Electricity, Solar heater, ORC system, business, hot water production, Solar flux
Abstract

Communication at the conference "Impact of Integrated Clean Energy on the Future of the Mediterranean Environment, MEDGREEN 2011" held in Beirut (Lebanon) 14-16 April 2011; International audience; Organic Rankine Cycle (ORC) is useful to generate electricity from low temperature sources such solar heat (< 120°C). An ORC system, working with R-245a, is presented and analyzed. The system provides the required electric power and the required hot sanitary water of a typical dwelling during one day (24 hours). The system operates between a cold source of 25°C and a hot source: water at 120°C in solar hours, when solar flux is available, and between a cold source of 15°C and a hot source: water at 98°C coming from the accumulation tank in no-solar hours (morning, evening, and night). The maximum generated electric power is 2000 W, and the used daily hot water is 200 l at 60°C. The required surface of the solar heater is 100 m 2 assuming 8 solar hours per day and a mean solar flux of 400 W/m 2. The advantages of the ORC system are the electricity generation, the hot water production and the low cost compared to photovoltaic electric power generation.

Published
2011
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26. Solar water heating in Cyprus: current status of technology and problems

Author

Soteris A. Kalogirou

Subjects
Environmental Engineering, Renewable Energy, Sustainability and the Environment, business.industry, Environmental engineering, Energy consumption, Solar energy, Solar water, Current (stream), Hot water production, Engineering and Technology, Ishikawa diagram, Production (economics), Environmental science, Solar water heating, Water quality, business, Energy source
Abstract

The Cyprus energy scene is first presented in this paper and it is shown that 6.5% of the annual energy demand is provided from solar energy. This energy is mainly used in the domestic sector (93.5%) for hot water production. The present status of the Cyprus solar water heating industry is then presented followed by analysis of the various possible problems faced during the life of a solar water heating system with respect to poor hot water quality (temperature) and quantity. The analysis is presented in the form of a cause and effect diagram. The main causes of problems are identified as arising from materials and production, design, installation, operation, transportation, environment and climate and maintenance.

Published
1997
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27. Use of solar Parabolic Trough Collectors for hot water production in Cyprus. A feasibility study

Author

Soteris A. Kalogirou and Stephen Lloyd

Subjects
Environmental Engineering, Scale (ratio), Renewable Energy, Sustainability and the Environment, business.industry, Environmental engineering, Solar energy, Water production, Life situation, Solar parabolic, Hot water production, Parabolic trough, Engineering and Technology, Environmental science, business
Abstract

This paper deals with a feasibility study for the use of solar Parabolic Trough Collectors for hot water production in Cyprus. An analysis is carried out for two types of applications, domestic and hotel. The systems are optimised using the F-chart program and compared to similar systems using Flat Plate Collectors. It is shown that for large scale water production the Parabolic Trough Collectors are more efficient than the Flat Plate ones. The life cycle savings from their use as applied to a real life situation is almost 5,350 Cyprus Pounds with 60% of the available solar energy being utilised.

Published
1992
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28. Performance of a Solar System used for Heating Cooling and Hot Water Production Employing Colored Collectors

Author

Kalogirou, Soteris A., Florides, Georgios A., Tripanagnostopoulos, Yiannis, and Souliotis, Manolis

Subjects
Color solar collectors, Environmental Engineering, Hot water production, Engineering and Technology, Space heating, Cooling
Abstract

To avoid the monotony of the black colored flat plate solar collectors, color absorbers can be used which have lower thermal efficiency than that of the usual black type collectors. In this paper a solar heating, cooling and hot water application with colored-absorber collectors of high (usual type) and low (selective) emissivity is presented. The house considered is 196 m2 insulated construction. The solar system consists of 20 m2 solar collectors and a 1000 lt storage tank. For the cooling system a LiBr absorption unit was used. The solar system provides part of the heating, cooling and hot water load for a 4-persons family. The system is simulated with TRNSYS on an annual basis at three different locations, Nicosia, Cyprus; Athens, Greece and Madison, Wisconsin. The results show that for a medium value of the coefficient of absorptance, the colored collectors give satisfactory results compared to collectors with black absorbers. This implies the use of slightly larger collector aperture area to have the same energy output as that of typical black colored collectors, which is acceptable.

Published
2005

30. Performance enhancement of an integrated collector storage hot water system

Author

Soteris A. Kalogirou

Subjects
Convection, Engineering, Renewable Energy, Sustainability and the Environment, business.industry, Water storage, Stratification (water), Mineralogy, Integrated Collector Storage (ICS) system, Mechanics, Convection suppression, Materials Engineering, Thermal energy storage, Concentration ratio, Thermal, Hot water production, Engineering and Technology, Thermosiphon, Performance enhancement, business
Abstract

Presented at World Renewable Energy Congress, 1998, 20-25 September, Florence, Italy Integrated collector storage (ICS) systems offer a solution to reduce the height of the conventional flat-plate thermosiphon type collectors. The initial system developed had an aperture area of 1.77 m2, a receiver diameter of 200 mm, a concentration ratio of 1.47 and total water storage volume of 65 litres. The main disadvantage of the ICS systems comes from their design, i.e., because the collector absorber is also the storage cylinder it is not possible to insulate it properly and therefore there are significant losses during the night. The main cause of these losses is the convection currents created during the night, circulating around the top glass cover. Another disadvantage of the system is its draw-off characteristics. Because the water cylinder/absorber is horizontal there is very little stratification of the water in the cylinder. It is suggested that a primary 110 mm diameter cylinder is introduced at the space between the main cylinder and the glass. The cold water is introduced directly to the primary cylinder, which feeds the main cylinder. With this modification the convection currents are drastically reduced due to the obstruction created by the primary vessel, thus reducing the night thermal losses. Also as the cold water is introduced first to the primary cylinder there is no direct mixing of the two streams thus greatly improving the system draw-off characteristics. This modification creates an 8% increase in the total cost of the system, which is reasonable, if the above benefits are considered.

Published
1999

32. Evaluation of the dynamic performance of a hot water tank with built-in heating coil

Author

Yang, L., Bohm, B., Paulsen, O., and Frederiksen, S.

Subjects
*PERFORMANCE evaluation
Abstract

Hot water tanks with a built-in water-heating coil are commonly usedin district heating house stations in Denmark for domestic hot water(DHW) production and storage. In this study, an evaluation of the dynamic performance of a hot water tank with built-in heating coil is carried out by applying a dynamic simulation programme which has been made previously, based on a simple dynamic model developed by the authors. System evaluation of the way in which system parameters, such as control valve size, heat loss coefficient of the DHW circulation pipe, position of the temperature sensor (for DHW temperature control) and fouling of the heating coil, affect the domestic hot water capacity and the average district heating water cooling for a given hot water tank is presented and discussed in this paper. The evaluation results show the importance of the correct design of the control valve size, the reduction of heat loss from DHW circulation pipes, the careful adjustment of temperature sensor position and temperature sensor set-point, and the reduction of the heat coil fouling growth rate in order to operate the hot water tank in an efficient way and to achieve significant cooling of the district heating water. [ABSTRACT FROM AUTHOR]

Published
1997
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34. Vytápění bytového domu

Author

Počinková, Marcela, Komínek, Petr, Ženožička, Filip, Počinková, Marcela, Komínek, Petr, and Ženožička, Filip

Abstract

Předmětem této bakalářské práce je návrh vytápění a přípravy teplé vody v bytovém domě ve Zlíně na Jižních Svazích. Objekt má pět nadzemních a jedno podzemní podlaží. V objektu jsou navrženy dvě varianty zdroje tepla pro vytápění a ohřev teplé vody (plynová kotelna a předávací stanice). V části A je řešeno využití solárních kolektorů k ohřevu teplé vody. Část B se zabývá návrhem otopné soustavy, přípravou teplé vody, pojistných a expanzních zařízení. Poslední část C tvoří technická zpráva a výkresová dokumentace vytápění objektu., The subject of this thesis is the design of heating and hot water in the apartment building in Zlin on Jižní Svahy. The building has five floors above ground and one underground floor. There are designed two variants of heat source for heating and hot water (gas boiler and transfer stations). Part A solved heating water by the use of solar collectors. Part B deals with design of the heating system, hot water heating, insurance and facility expansion. The last part C forms a technical report and drawings heating in the building.

35. Využití obnovitelných zdrojů energie pro vytápění

Author

Horák, Petr, Počinková, Marcela, Heneková, Barbara, Horák, Petr, Počinková, Marcela, and Heneková, Barbara

Abstract

Bakalárska práca rieši návrh podlahového vykurovania administratívnej budovy. Teoretická časť je zameraná na charakteristiku tepelných čerpadiel. Časť výpočtová je samotný návrh teplovodného podlahového vykurovania. Zdrojom tepla je tepelné čerpadlo vzduch- voda umiestnené do exteriéru. Práca obsahuje návrh potrebných zariadení pre správnu funkčnosť sústavy kúrenia a prípravy teplej vody., This work is solving the proposal of underfloor heating office building. The theoretical part focused on the characteristics of heat pumps.The computational part is making a proposal for underfloor heating. The warm source is a heat pump of air and water, located in the exterior. The work includes a proposal for the all needed equipement and also the design of the source of warm water.

36. Vytápění bytového domu

Author

Počinková, Marcela, Topič, Jan, Buřič, Jan, Počinková, Marcela, Topič, Jan, and Buřič, Jan

Abstract

Cílem této bakalářské práce je návrh vytápění a přípravy teplé vody novostavby bytového domu v Trhových Svinech u Českých Budějovic. V první části je řešena problematika centralizované zásobování teplem a jednotlivé typy výměníků. Druhá část se zabývá samostatným návrhem vytápění a přípravy teplé vody v bytovém domě. Jako zdroje tepla byla navržena teplovodní předávací stanice s deskovým výměníkem. Příprava teplé vody je zajištěna taktéž deskovým výměníkem napojeným na CZT. Třetí část tvoří technická zpráva a výkresová dokumentace vytápění zadaného objektu., The aim this bachelor thesis is the design of heating and hot water in new building apartment house in Trhové Sviny by České Budějovice. In the first part the issues of centralized heat supply and the different types of heat exchangers. The second part deals with a separate proposal heating and hot water in the apartment building. As the heat source was proposed transfer station with hot water plate heat exchanger. The hot water is also ensured plate heat exchanger connected to the central heating. The third part consists of a technical report and drawings heating of the specified object.

37. Vytápění bytového domu

Author

Počinková, Marcela, Topič, Jan, Buřič, Jan, Počinková, Marcela, Topič, Jan, and Buřič, Jan

Abstract

Cílem této bakalářské práce je návrh vytápění a přípravy teplé vody novostavby bytového domu v Trhových Svinech u Českých Budějovic. V první části je řešena problematika centralizované zásobování teplem a jednotlivé typy výměníků. Druhá část se zabývá samostatným návrhem vytápění a přípravy teplé vody v bytovém domě. Jako zdroje tepla byla navržena teplovodní předávací stanice s deskovým výměníkem. Příprava teplé vody je zajištěna taktéž deskovým výměníkem napojeným na CZT. Třetí část tvoří technická zpráva a výkresová dokumentace vytápění zadaného objektu., The aim this bachelor thesis is the design of heating and hot water in new building apartment house in Trhové Sviny by České Budějovice. In the first part the issues of centralized heat supply and the different types of heat exchangers. The second part deals with a separate proposal heating and hot water in the apartment building. As the heat source was proposed transfer station with hot water plate heat exchanger. The hot water is also ensured plate heat exchanger connected to the central heating. The third part consists of a technical report and drawings heating of the specified object.

38. Vytápění mateřské školy

Author

Počinková, Marcela, Topič, Jan, Černý, Tomáš, Počinková, Marcela, Topič, Jan, and Černý, Tomáš

Abstract

Bakalářská práce řeší návrh vytápění mateřské školy. Teoretická část se věnuje tématu podlahové vytápění. Část výpočtová obsahuje návrh vytápění objektu s použitím teplovodního podlahového vytápění. Dále řeší výpočet teplovodního výměníku pro nucené větrání vybraných místností. Jako zdroj tepla je navrhnuto tepelné čerpadlo vzduch-voda. Součástí výpočtů je také příprava teplé vody a všech potřebných zařízení soustavy. Mateřská škola je navrhnuta jako budova s téměř nulovou spotřebou energie., The bachelor thesis solves the design of the nursery heating. The theoretical part deals with the topic of floor heating. The calculation part contains the design of heating the building using hot-water underfloor heating. Further solves the calculation of hot water exchanger for forced ventilation of selected rooms. The air-water heat pump is designed as the heat source. Part of the calculations is also the preparation of hot water and all the necesary equipment of the system. Kindergarten is designed as a nearly zero-energy building.

39. Vytápění sportovního centra

Author

Počinková, Marcela, Horká, Lucie, Fuksa, Lukáš, Počinková, Marcela, Horká, Lucie, and Fuksa, Lukáš

Abstract

Předmětem této bakalářské práce je návrh vytápění sportovního centra. Práce se skládá ze třech částí. V první teoretické části se zaobírá možnými způsoby vytápění velkoprostorových a halových objektů. Ve druhé výpočtové části řeší návrh vytápění sportovního centra. Ta zahrnuje výpočet tepelných ztrát, návrh otopných ploch a zdroje tepla, způsob přípravy teplé vody, dimenzování, zabezpečovací zařízení a další výpočty. Ve třetí části řeší výkresovou dokumentaci spolu s technickou zprávou., Subject of this bachelor thesis is the design of heating in sport centre. Thesis includes three parts. The first theoretical part solves available ways of heating of large spaces and hall objects. The second calculations part solves design of heating in sport centre. This part includes heat loss, design heating surfaces, hot water production, dimensioning, safety equipment and other calculations. The third part solves drawings with technical report.

40. Vytápění mateřské školy

Author

Treuová, Lea, Čupr, Karel, Pospíšilová, Lucie, Treuová, Lea, Čupr, Karel, and Pospíšilová, Lucie

Abstract

Bakalářská práce řeší návrh vytápění mateřské školy. Teoretická část se věnuje problému větrání budov školních zařízení a tepelné pohody prostředí. V neposlední řadě popisuje rozdělení otopných soustav z hlediska přenosu tepla a koncové prvky. Na závěr jsou charakterizovány varianty zdrojů tepla pro vytápění. Část výpočtová obsahuje návrh vytápění jednotlivých místností v kombinaci otopných těles a teplovodního podlahového vytápění. Dále řeší výpočet teplovodního výměníku pro nucené větrání vybraných místností. Součástí výpočtů je také návrh zdroje tepla, příprava teplé vody a všech potřebných zařízení soustavy., Bacelor thesis attends to heating concept for kindergarten. The teoretical part deals with building ventilation issue for school unit and comfortable environment. It describes heater distribution in terms of heat trasnfer and end component units. In conclusion, variants of heat source for heating are characterized. Computational part contains heating design for each room in combination with heater and hot water underfloor heating. It also solves hot water exchanger calculation for forced vantilation of specific rooms. There is heat source design, hot water production and other required devices for system, which is part of calculations as well.

41. Vytápění mateřské školy

Author

Počinková, Marcela, Topič, Jan, Černý, Tomáš, Počinková, Marcela, Topič, Jan, and Černý, Tomáš

Abstract

Bakalářská práce řeší návrh vytápění mateřské školy. Teoretická část se věnuje tématu podlahové vytápění. Část výpočtová obsahuje návrh vytápění objektu s použitím teplovodního podlahového vytápění. Dále řeší výpočet teplovodního výměníku pro nucené větrání vybraných místností. Jako zdroj tepla je navrhnuto tepelné čerpadlo vzduch-voda. Součástí výpočtů je také příprava teplé vody a všech potřebných zařízení soustavy. Mateřská škola je navrhnuta jako budova s téměř nulovou spotřebou energie., The bachelor thesis solves the design of the nursery heating. The theoretical part deals with the topic of floor heating. The calculation part contains the design of heating the building using hot-water underfloor heating. Further solves the calculation of hot water exchanger for forced ventilation of selected rooms. The air-water heat pump is designed as the heat source. Part of the calculations is also the preparation of hot water and all the necesary equipment of the system. Kindergarten is designed as a nearly zero-energy building.

42. Vytápění mateřské školy

Author

Treuová, Lea, Čupr, Karel, Pospíšilová, Lucie, Treuová, Lea, Čupr, Karel, and Pospíšilová, Lucie

Abstract

Bakalářská práce řeší návrh vytápění mateřské školy. Teoretická část se věnuje problému větrání budov školních zařízení a tepelné pohody prostředí. V neposlední řadě popisuje rozdělení otopných soustav z hlediska přenosu tepla a koncové prvky. Na závěr jsou charakterizovány varianty zdrojů tepla pro vytápění. Část výpočtová obsahuje návrh vytápění jednotlivých místností v kombinaci otopných těles a teplovodního podlahového vytápění. Dále řeší výpočet teplovodního výměníku pro nucené větrání vybraných místností. Součástí výpočtů je také návrh zdroje tepla, příprava teplé vody a všech potřebných zařízení soustavy., Bacelor thesis attends to heating concept for kindergarten. The teoretical part deals with building ventilation issue for school unit and comfortable environment. It describes heater distribution in terms of heat trasnfer and end component units. In conclusion, variants of heat source for heating are characterized. Computational part contains heating design for each room in combination with heater and hot water underfloor heating. It also solves hot water exchanger calculation for forced vantilation of specific rooms. There is heat source design, hot water production and other required devices for system, which is part of calculations as well.

43. Otopná soustava knihovny

Author

Počinková, Marcela, Adam, Pavel, Dlabajová, Pavlína, Počinková, Marcela, Adam, Pavel, and Dlabajová, Pavlína

Abstract

Závěrečná práce řeší vytápění univerzitní knihovny Přírodovědecké fakulty Masarykovy univerzity, situované na ulici Kotlářská 267/2, 611 37 Brno. Projekt se zabývá výpočtem tepelného výkonu, návrhem zdroje tepla, přípravy teplé užitkové vody, otopných ploch a návrhem přípravy teplé vody pro vzduchotechniku. Dimenzováním a hydraulickým posouzením potrubí, návrhem čerpadel a zabezpečovacího zařízení., This study presents the structure of the heating system in the library of Masaryk University of Science with the address Kotlarska 267/2, 611 37 Brno. In particular, this study will examine the calculations of the heating output, proposals for sources of the heating output, preparation of the hot water, heating surfaces and the proposal for the hot water for the hydraulic piping. Additionally, the author will conduct an evaluation of the dimensions as well as a hydraulic assessment of the pipeline, the design of the pumps, and lastly the safefy equipment.

44. Vytápění výrobního objektu s administrativou

Author

Vendlová, Lucie, Formánek, Marian, Březina, Jan, Vendlová, Lucie, Formánek, Marian, and Březina, Jan

Abstract

Úkolem této bakalářské práce je porovnat způsoby vytápění průmyslových hal a navrhnout vhodný systém vytápění do zadaného výrobního objektu, který se nachází na okraji města Brna. Objekt je tvořen dvěma jednopodlažními halami s připojenou administrativní částí o třech nadzemních podlažích. Vytápění je v celém objektu realizováno konvekčním způsobem, nucené větrání je pouze v halách. Zdrojem tepla je plynový kondenzační kotel umístěný spolu se vzduchotechnickou jednotkou v technické místnosti. Systém vytápění je navržen s důrazem na zajištění bezproblémové a co nejefektivnější funkčnosti., The purpose of this bachelor thesis is to compare different heating systems for industrial buildings and to find suitable solution for the heating system of the manufacturing building located on Brno periphery. The manufacturing area consists of two one-floor manufacturing halls and three-floors administrative building. The building heating is ensured conventionally, forced ventilation is only in manufacturing halls. The heat source is gas condensing boiler located together with air-conditioning unit in technical room. The heating system is designed with accent to smooth and effective functionality.

45. Otopná soustava knihovny

Author

Počinková, Marcela, Adam, Pavel, Dlabajová, Pavlína, Počinková, Marcela, Adam, Pavel, and Dlabajová, Pavlína

Abstract

Závěrečná práce řeší vytápění univerzitní knihovny Přírodovědecké fakulty Masarykovy univerzity, situované na ulici Kotlářská 267/2, 611 37 Brno. Projekt se zabývá výpočtem tepelného výkonu, návrhem zdroje tepla, přípravy teplé užitkové vody, otopných ploch a návrhem přípravy teplé vody pro vzduchotechniku. Dimenzováním a hydraulickým posouzením potrubí, návrhem čerpadel a zabezpečovacího zařízení., This study presents the structure of the heating system in the library of Masaryk University of Science with the address Kotlarska 267/2, 611 37 Brno. In particular, this study will examine the calculations of the heating output, proposals for sources of the heating output, preparation of the hot water, heating surfaces and the proposal for the hot water for the hydraulic piping. Additionally, the author will conduct an evaluation of the dimensions as well as a hydraulic assessment of the pipeline, the design of the pumps, and lastly the safefy equipment.

46. Zdroje tepla pro průmyslové objekty

Author

Formánek, Marian, Počinková, Marcela, Vejnarová, Nikola, Formánek, Marian, Počinková, Marcela, and Vejnarová, Nikola

Abstract

Diplomová práce se věnuje návrhu nového zdroje tepla stávajícího objektu. První část se zabývá tepelnými zdroji a palivy používaných v České republice. Náplní druhé části je pak samostatný návrh zdroje tepla ve třech variantách: plynové kotle, kogenerační jednotka s elektrokotli a kogenerační jednotka s plynovými kotli. Jednotlivé varianty budou hodnoceny také z hlediska uživatelského komfortu, prostorových nároků, či ekonomiky provozu. Dále bude provedeno měření a vyhodnocení vnitřního prostředí jídelny., The thesis is focused on the design of the new heat source of the existing building. The first part deals with the heat sources and fuels used in the Czech Republic. The second part includes design of three variants of heat sources: gas boilers, cogeneration unit with the electric boilers and cogeneration unit with gas boilers. The individual variations are also evaluated in terms of user comfort, space requirements or economy of operation. The third part includes measurement and evaluation of internal environment of the dining hall.

47. Zdroje tepla pro průmyslové objekty

Author

Formánek, Marian, Počinková, Marcela, Vejnarová, Nikola, Formánek, Marian, Počinková, Marcela, and Vejnarová, Nikola

Abstract

Diplomová práce se věnuje návrhu nového zdroje tepla stávajícího objektu. První část se zabývá tepelnými zdroji a palivy používaných v České republice. Náplní druhé části je pak samostatný návrh zdroje tepla ve třech variantách: plynové kotle, kogenerační jednotka s elektrokotli a kogenerační jednotka s plynovými kotli. Jednotlivé varianty budou hodnoceny také z hlediska uživatelského komfortu, prostorových nároků, či ekonomiky provozu. Dále bude provedeno měření a vyhodnocení vnitřního prostředí jídelny., The thesis is focused on the design of the new heat source of the existing building. The first part deals with the heat sources and fuels used in the Czech Republic. The second part includes design of three variants of heat sources: gas boilers, cogeneration unit with the electric boilers and cogeneration unit with gas boilers. The individual variations are also evaluated in terms of user comfort, space requirements or economy of operation. The third part includes measurement and evaluation of internal environment of the dining hall.

48. Vytápění mateřské školy

Author

Počinková, Marcela, Wierzbická, Helena, Jetelina, Michal, Počinková, Marcela, Wierzbická, Helena, and Jetelina, Michal

Abstract

Bakalářská práce řeší návrh vytápění mateřské školy. Teoretická část se věnuje popisu a charakteristice teplovodního vytápění, jež je v návrhu užito. Část výpočtová obsahuje návrh vytápění objektu. Systém je navrhnut jako kombinace nízkoteplotní soustavy s užitím deskových otopných těles a teplovodního podlahového vytápění. Jako zdroj tepla je navrhnuto tepelné čerpadlo vzduch-voda umístěné v exteriéru. Větrání budovy je přirozené či nucené, dle charakteru místnosti. Práce obsahuje návrh všech potřebných zařízení soustavy a rovněž i návrh přípravy teplé vody., This work is solving the proposal of heating a kindergarten. The theoretical part is focused on warm water heating, which is used in the proposal. The computational part includes a proposal of heating the building. The system is a combination of low temperature system and underfloor heating. As a warm source, there is a design of thermal pump of air and water, which is located in exterior. The ventilation of the building is natural or forced, depending on location. The work contains proposal of all needed equipment and also the design of the source of warm water.

49. Vytápění bytového domu

Author

Počinková, Marcela, Komínek, Petr, Ženožička, Filip, Počinková, Marcela, Komínek, Petr, and Ženožička, Filip

Abstract

Předmětem této bakalářské práce je návrh vytápění a přípravy teplé vody v bytovém domě ve Zlíně na Jižních Svazích. Objekt má pět nadzemních a jedno podzemní podlaží. V objektu jsou navrženy dvě varianty zdroje tepla pro vytápění a ohřev teplé vody (plynová kotelna a předávací stanice). V části A je řešeno využití solárních kolektorů k ohřevu teplé vody. Část B se zabývá návrhem otopné soustavy, přípravou teplé vody, pojistných a expanzních zařízení. Poslední část C tvoří technická zpráva a výkresová dokumentace vytápění objektu., The subject of this thesis is the design of heating and hot water in the apartment building in Zlin on Jižní Svahy. The building has five floors above ground and one underground floor. There are designed two variants of heat source for heating and hot water (gas boiler and transfer stations). Part A solved heating water by the use of solar collectors. Part B deals with design of the heating system, hot water heating, insurance and facility expansion. The last part C forms a technical report and drawings heating in the building.

50. Teplonosné látky tepelných soustav

Author

Počinková, Marcela, Topič, Jan, Ženožička, Filip, Počinková, Marcela, Topič, Jan, and Ženožička, Filip

Abstract

Předmětem této diplomové práce jsou teplonosné látky tepelných soustav a návrh vytápění a přípravy teplé vody v administrativním domě ve Zlíně na Jižních Svazích. Objekt má pět nadzemních a jedno podzemní podlaží. V objektu jsou navrženy dvě varianty zdroje tepla pro vytápění a ohřev teplé vody (předávací stanice a plynová kotelna). V části A je řešena kvalita otopné vody. Část B se zabývá návrhem otopné soustavy, přípravou teplé vody, pojistných a expanzních zařízení, technická zpráva a výkresová dokumentace vytápění objektu. Poslední část C pak tvoří experimentální měření kvality otopné vody v soustavách CZT., The subject of this diploma thesis is the design of heating and hot water in the administrative building in Zlin on Jižní Svahy. The building has five floors above ground and one underground floor. There are designed two variants of heat source for heating and hot water (transfer sta-tions and gas boiler). Part A solves water quality in heating systems. Part B deals with design of the heating system, hot water heating, insurance and facility expansion, technical report and drawings heating in the building. The last part C is the experimental measurement of the quality of heating water in the CZT systems.

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