19 results on '"building loads"'
Search Results
2. Effects of Cyclic Temperature Variations on Thermal Response of an Energy Pile under a Residential Building
- Author
-
Faizal, Mohammed, Bouazza, Abdelmalek, McCartney, John S, and Haberfield, Chris
- Subjects
Affordable and Clean Energy ,Energy pile ,Field tests ,Thermal responses ,Building loads ,Cyclic temperatures ,Civil Engineering ,Environmental Engineering ,Geological & Geomatics Engineering - Published
- 2019
3. Axial and radial thermal responses of energy pile under six storey residential building
- Author
-
Faizal, Mohammed, Bouazza, Abdelmalek, McCartney, John S, and Haberfield, Chris
- Subjects
Affordable and Clean Energy ,energy piles ,field tests ,axial thermal response ,radial thermal response ,building loads ,Civil Engineering ,Environmental Engineering ,Geological & Geomatics Engineering - Abstract
The axial and radial thermal responses of a cast-in-place energy pile, 10 m long and 0.6 m in diameter, installed in unsaturated sand under a six storey building are examined during a heating–cooling cycle. The instrumentation in the pile was configured to compare radial and axial thermal responses at the same elevations and to evaluate the temperature and axial thermal stress distribution across the cross-sectional area of the pile. The magnitudes of the axial thermal strains were more constrained than the radial thermal strains at all depths, leading to the development of axial and radial thermal stresses of up to –4.5 and –0.015 MPa, respectively, for a change in average pile temperature of 24.1 °C. The magnitudes of the radial thermal stresses with changes in pile temperature were significantly lower than the axial thermal stresses at all depths of the pile, indicating that the radial thermal expansion had negligible effects on the development of axial thermal strains and stresses. The temperature distribution over the cross section of the pile showed low variations at all depths, indicating that it would be justified to consider a uniform temperature distribution at least in piles of similar dimensions and with even heat exchanger layouts.
- Published
- 2019
4. Próbne obciążenia płyt korytkowych dachu maszynowni w elektrowni.
- Author
-
HOTAŁA, EUGENIUSZ
- Abstract
Copyright of Builder (1896-0642) is the property of PWB MEDIA Zdzieblowski sp.j. 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
- 2022
- Full Text
- View/download PDF
5. Path to Zero: Ultra-Efficient Architecture on the NREL Campus: S&TF and Master Planning (Presentation)
- Author
-
Carlisle, Nancy
- Published
- 2012
6. Understanding the Influence of Building Loads on Surface Settlement: A Case Study in the Central Business District of Beijing Combining Multi-Source Data
- Author
-
Fengkai Li, Huili Gong, Beibei Chen, Mingliang Gao, Chaofan Zhou, and Lin Guo
- Subjects
surface settlement ,additional stress ,building loads ,PS-InSAR ,Science - Abstract
In metropolitan areas, the static load of high-rise buildings may result in uneven settlement, which seriously threatens residents’ living safety. Studying the response relationship between the additional stress of high-rise buildings and foundation settlement plays an important role in ensuring the safe development of metropolitan cities. Firstly, based on Persistent Scatterers Interferometric Aperture Radar (PS-InSAR) technology, we used 68 descending TerraSAR-X images to obtain the surface settlement in the study area from April 2010 to October 2018, which were validated with leveling benchmark monitoring results. Secondly, we calculated the additional stress of the building loads to quantify its effect on the uneven settlement in the Central Business District (CBD) of Beijing. Finally, two sets of characteristic points were selected to analyze the response relationships between foundation settlement and additional stress generated by building loads. The findings show: (1) The surface settlement rate varied from −145.2 to 24 mm/year in the Beijing Plain. The InSAR results agree well with the monitoring results derived from the leveling benchmark; the Pearson correlation coefficients were 0.98 and 0.95 in 2011–2013 and 2015–2016, respectively. (2) The stress results show that the depth of the influence of the static load of high-rise buildings was 74.9 m underground in the CBD. (3) The spatial distribution pattern of the additional stress is consistent with the foundation settlement. A characteristic point with greater additional stress in the same group has a higher foundation settlement rate. This relationship has also been found between the uneven foundation settlement and additional stress gradients. These findings provide scientific support for mitigating economic losses due to foundation settlement caused by additional stresses derived from building loads.
- Published
- 2021
- Full Text
- View/download PDF
7. An Overview of Phase Change Materials for Building Applications
- Author
-
Taheri, Helia, Sharma, Atul, Sharma, Atul, editor, and Kar, Sanjay Kumar, editor
- Published
- 2015
- Full Text
- View/download PDF
8. Statistical Analysis of Solar PV Power Frequency Spectrum for Optimal Employment of Building Loads
- Author
-
Fugate, David [ORNL]
- Published
- 2017
9. Energy Conservation Law in Industrial Architecture: An Approach through Geometric Algebra.
- Author
-
Bravo, Juan C. and Castilla, Manuel V.
- Subjects
- *
ELECTRICAL engineering , *ENGINEERING , *ELECTRIC networks , *ENERGY conservation , *HEPATIC veno-occlusive disease - Abstract
Since 1892, the electrical engineering scientific community has been seeking a power theory for interpreting the power flow within electric networks under non-sinusoidal conditions. Although many power theories have been proposed regarding non-sinusoidal operation, an adequate solution is yet to be found. Using the framework based on complex algebra in non-sinusoidal circuit analysis (frequency domain), the verification of the energy conservation law is only possible in sinusoidal situations. In this case, reactive energy turns out to be proportional to the energy difference between the average electric and magnetic energies stored in the loads and its cancellation is mathematically trivial. However, in industrial architecture, apparent power definition of electric loads (non-sinusoidal conditions) is inconsistent with the energy conservation law. Up until now, in the classical complex algebra approach, this goal is only valid in the case of purely resistive loads. Thus, in this paper, a new circuit analysis approach using geometric algebra is used to develop the most general proof of energy conservation in industrial building loads. In terms of geometric objects, this powerful tool calculates the voltage, current, and apparent power in electrical systems in non-sinusoidal, linear/nonlinear situations. In contrast to the traditional method developed by Steinmetz, the suggested powerful tool extends the concept of phasor to multivector-phasors and is performed in a new Generalized Complex Geometric Algebra structure (CGn), where Gn is the Clifford algebra in n-dimensional real space and C is the complex vector space. To conclude, a numerical example illustrates the clear advantages of the approach suggested in this paper. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
10. Energy Conservation Law in Industrial Architecture: An Approach through Geometric Algebra
- Author
-
Juan C. Bravo and Manuel V. Castilla
- Subjects
energy conservation law ,building loads ,harmonics ,Geometric Algebra ,Mathematics ,QA1-939 - Abstract
Since 1892, the electrical engineering scientific community has been seeking a power theory for interpreting the power flow within electric networks under non-sinusoidal conditions. Although many power theories have been proposed regarding non-sinusoidal operation, an adequate solution is yet to be found. Using the framework based on complex algebra in non-sinusoidal circuit analysis (frequency domain), the verification of the energy conservation law is only possible in sinusoidal situations. In this case, reactive energy turns out to be proportional to the energy difference between the average electric and magnetic energies stored in the loads and its cancellation is mathematically trivial. However, in industrial architecture, apparent power definition of electric loads (non-sinusoidal conditions) is inconsistent with the energy conservation law. Up until now, in the classical complex algebra approach, this goal is only valid in the case of purely resistive loads. Thus, in this paper, a new circuit analysis approach using geometric algebra is used to develop the most general proof of energy conservation in industrial building loads. In terms of geometric objects, this powerful tool calculates the voltage, current, and apparent power in electrical systems in non-sinusoidal, linear/nonlinear situations. In contrast to the traditional method developed by Steinmetz, the suggested powerful tool extends the concept of phasor to multivector-phasors and is performed in a new Generalized Complex Geometric Algebra structure (CGn), where Gn is the Clifford algebra in n-dimensional real space and C is the complex vector space. To conclude, a numerical example illustrates the clear advantages of the approach suggested in this paper.
- Published
- 2016
- Full Text
- View/download PDF
11. Effects of Cyclic Temperature Variations on Thermal Response of an Energy Pile under a Residential Building
- Author
-
Mohammed Faizal, John S. McCartney, Chris M. Haberfield, and Abdelmalek Bouazza
- Subjects
021110 strategic, defence & security studies ,Environmental Engineering ,Energy pile ,0211 other engineering and technologies ,02 engineering and technology ,Field tests ,Building loads ,Cyclic temperatures ,Geotechnical Engineering and Engineering Geology ,Geological & Geomatics Engineering ,Civil Engineering ,Thermal responses ,Affordable and Clean Energy ,Thermal ,Environmental science ,Geotechnical engineering ,Pile ,Energy (signal processing) ,021101 geological & geomatics engineering ,General Environmental Science - Abstract
The effects of daily cyclic temperature variations on the thermal response of an energy pile built under a six-level residential building are examined. The axial and radial thermal strains ...
- Published
- 2019
12. Understanding the Influence of Building Loads on Surface Settlement: A Case Study in the Central Business District of Beijing Combining Multi-Source Data.
- Author
-
Li, Fengkai, Gong, Huili, Chen, Beibei, Gao, Mingliang, Zhou, Chaofan, and Guo, Lin
- Subjects
- *
CENTRAL business districts , *SETTLEMENT of structures , *DEAD loads (Mechanics) , *PEARSON correlation (Statistics) , *METROPOLITAN areas , *SKYSCRAPERS - Abstract
In metropolitan areas, the static load of high-rise buildings may result in uneven settlement, which seriously threatens residents' living safety. Studying the response relationship between the additional stress of high-rise buildings and foundation settlement plays an important role in ensuring the safe development of metropolitan cities. Firstly, based on Persistent Scatterers Interferometric Aperture Radar (PS-InSAR) technology, we used 68 descending TerraSAR-X images to obtain the surface settlement in the study area from April 2010 to October 2018, which were validated with leveling benchmark monitoring results. Secondly, we calculated the additional stress of the building loads to quantify its effect on the uneven settlement in the Central Business District (CBD) of Beijing. Finally, two sets of characteristic points were selected to analyze the response relationships between foundation settlement and additional stress generated by building loads. The findings show: (1) The surface settlement rate varied from −145.2 to 24 mm/year in the Beijing Plain. The InSAR results agree well with the monitoring results derived from the leveling benchmark; the Pearson correlation coefficients were 0.98 and 0.95 in 2011–2013 and 2015–2016, respectively. (2) The stress results show that the depth of the influence of the static load of high-rise buildings was 74.9 m underground in the CBD. (3) The spatial distribution pattern of the additional stress is consistent with the foundation settlement. A characteristic point with greater additional stress in the same group has a higher foundation settlement rate. This relationship has also been found between the uneven foundation settlement and additional stress gradients. These findings provide scientific support for mitigating economic losses due to foundation settlement caused by additional stresses derived from building loads. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
13. Multivectorial strategy to interpret a resistive behaviour of loads in smart buildings
- Author
-
M. Castilla, Juan C. Bravo, and Francisco Martín
- Subjects
Resistive touchscreen ,Computer science ,020209 energy ,Non-sinusoidal waveform ,020208 electrical & electronic engineering ,02 engineering and technology ,Power factor ,Building loads ,AC power ,Geometric algebra (GA) ,Compensation (engineering) ,Ingeniería eléctrica - Matemáticas ,Multivector ,Distortion ,Resistive loads ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Electronics ,Voltage - Abstract
In Smart buildings, electric loads are affected by an important distortion in the current and voltage waveforms, caused by the increasing proliferation of non linear electronic devices. This paper presents an approach on non sinusoidal power theory based on Geometric Algebra that clearly improves traditional methods in the optimization of apparent power and power factor compensation. An example is included that demonstrates the superiority of this approach compared with traditional methods. Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.
- Published
- 2018
14. Energy conservation law in industrial architecture: an approach through geometric algebra
- Author
-
Universidad de Sevilla. Departamento de Ingeniería del Diseño, Universidad de Sevilla. RNM162: Composición, Arquitectura y Medio Ambiente, Bravo-Rodríguez, Juan Carlos, Castilla Roldán, Manuel-Viggo, Universidad de Sevilla. Departamento de Ingeniería del Diseño, Universidad de Sevilla. RNM162: Composición, Arquitectura y Medio Ambiente, Bravo-Rodríguez, Juan Carlos, and Castilla Roldán, Manuel-Viggo
- Abstract
Since 1892, the electrical engineering scientific community has been seeking a power theory for interpreting the power flow within electric networks under non-sinusoidal conditions. Although many power theories have been proposed regarding non-sinusoidal operation, an adequate solution is yet to be found. Using the framework based on complex algebra in non-sinusoidal circuit analysis (frequency domain), the verification of the energy conservation law is only possible in sinusoidal situations. In this case, reactive energy turns out to be proportional to the energy difference between the average electric and magnetic energies stored in the loads and its cancellation is mathematically trivial. However, in industrial architecture, apparent power definition of electric loads (non-sinusoidal conditions) is inconsistent with the energy conservation law. Up until now, in the classical complex algebra approach, this goal is only valid in the case of purely resistive loads. Thus, in this paper, a new circuit analysis approach using geometric algebra is used to develop the most general proof of energy conservation in industrial building loads. In terms of geometric objects, this powerful tool calculates the voltage, current, and apparent power in electrical systems in non-sinusoidal, linear/nonlinear situations. In contrast to the traditional method developed by Steinmetz, the suggested powerful tool extends the concept of phasor to multivector-phasors and is performed in a new Generalized Complex Geometric Algebra structure (CGn), where Gn is the Clifford algebra in n-dimensional real space and C is the complex vector space. To conclude, a numerical example illustrates the clear advantages of the approach suggested in this paper.
- Published
- 2016
15. Assessment of Distributed Energy Adoption in Commercial Buildings : Part 1 An Analysis of Policy, Building loads, Tariff Design, and Technology Development(DEPARTMENT OF ARCHITECTURE)
- Subjects
building energy efficiency ,building loads ,tariff ,combined heat and power ,distributed energy resources - Abstract
Rapidly growing electricity demand brings into question the ability of traditional grids to expand correspondingly while providing reliable service. An alternative path is the wider application of distributed energy resource (DER) that apply combined heat and power (CHP). It can potentially shave peak loads and satiate its growing thirst for electricity demand, improve overall energy efficiency, and lower carbon and other pollutant emissions. This research investigates a method of choosing economically optimal DER, expanding on prior studies at the Berkeley Lab using the DER design optimization program, the Distributed Energy Resources Customer Adoption Model (DER-CAM). DER-CAM finds the optimal combination of installed equipment from available DER technologies, given prevailing utility tariffs, site electrical and thermal loads, and a menu of available equipment. It provides a global optimization, albeit idealized, that shows how the site energy loads can be served at minimum cost by selection and operation of on-site generation, heat recovery, and cooling. Utility electricity and gas tariffs are key factors determining the economic benefit of a CHP installation, however often are neglected. This paper describes preliminary analysis on CHP investment climate in the U.S. and Japan. DER technologies, energy prices, and incentive measures has been investigated.
- Published
- 2005
16. Climatic, parametric and non-parametric analysis of energy performance of double-glazed windows in different climates
- Author
-
Banihashemi, Saeed, Golizadeh, Hamed, Hosseini, M. Reza, Shakouri, Mahmoud, Banihashemi, Saeed, Golizadeh, Hamed, Hosseini, M. Reza, and Shakouri, Mahmoud
- Abstract
In line with the growing global trend toward energy efficiency in buildings, this paper aims to first; investigate the energy performance of double-glazed windows in different climates and second; analyze the most dominant used parametric and non-parametric tests in dimension reduction for simulating this component. A four-story building representing the conventional type of residential apartments for four climates of cold, temperate, hot-arid and hot-humid was selected for simulation. 10 variables of U-factor, SHGC, emissivity, visible transmittance, monthly average dry bulb temperature, monthly average percent humidity, monthly average wind speed, monthly average direct solar radiation, monthly average diffuse solar radiation and orientation constituted the parameters considered in the calculation of cooling and heating loads of the case. Design of Experiment and Principal Component Analysis methods were applied to find the most significant factors and reduction dimension of initial variables. It was observed that in two climates of temperate and hot-arid, using double glazed windows was beneficial in both cold and hot months whereas in cold and hot-humid climates where heating and cooling loads are dominant respectively, they were advantageous in only those dominant months. Furthermore, an inconsistency was revealed between parametric and non-parametric tests in terms of identifying the most significant variables.
- Published
- 2015
17. Computer Program for the Analysis of Loads on Buildings Using the ASCE 7-93 Standard Minimum Design Loads on Buildings and Other Structures
- Author
-
Civil Engineering, Rojiani, Kamal B., Garst, Donald A., Easterling, William Samuel, Browning, Stephen E., Civil Engineering, Rojiani, Kamal B., Garst, Donald A., Easterling, William Samuel, and Browning, Stephen E.
- Abstract
A computer program for the analysis of loads on buildings is developed. The program determines wind loads, earthquake loads, and snow loads according to the ASCE 7-93 Standard Minimum Design Loads for Buildings and Other Structures (ASCE 7-93). The program is developed using the object-oriented programming methodology and runs on the Microsoft Windows 95 graphical environment. It is a valuable and useful tool for determining loads on buildings.
- Published
- 1998
18. Energy analysis of toplighting strategies for office buildings in Austin
- Author
-
Motamedi, Sara
- Subjects
- Toplighting, Energy efficiency, Offices, Building loads
- Abstract
The purpose of this study is to determine the energy impacts of daylighing through toplights in a hot humid climate. Daylight in the working environment improves the quality of the space, and productivity of employees. In addition, natural light is a free energy resource. On one hand, a proper design of daylight such as distributed toplights can reduce the electrical lighting consumption. On the other hand, in a hot climate like Austin heat gain is a major concern. Therefore, this thesis is shaped around this question: Can toplighting strategies save energy in Austin despite the fact that buildings receive more direct heat gain through toplights? The importance of daylighting is more revealed since electrical lighting takes up a significant portion of the total building energy use (21%). In this thesis I investigated the reduction of lighting electricity and compared that with the total effects of toplights on external conductance, lighting heat gain and solar gain. The results of my thesis show that regarding the site energy a proper toplighting strategy can save electrical lighting up to (70%) with smaller impact on heating and cooling loads. This means that toplights generally can be energy efficient alternatives for a one storey office building. Developing my research I studied which toplights are more efficient: north sawtooth roofs, south sawtooth roofs, monitor roofs or very simple skylights. I compared different toplighting strategies and provided a design guide containing graphs of site energy, source energy, annual cost saving per square feet, as well as light distribution of each toplight. I believe this can accelerate implementation of efficient toplighting strategies in the design process. Concluding how significantly efficient daylighting is over heat gain, I finalized my research by comparison of skylights with different visible transmission (VT) and solar heat gain coefficient (SHGC). The major result of this thesis is that proper toplighting strategies can save energy despite the increased solar gain. It is anticipated that the thesis findings will promote the implementation of toplighting strategies and higher VT glass type in the energy efficient building industry.
- Published
- 2012
19. Climatic, parametric and non-parametric analysis of energy performance of double-glazed windows in different climates
- Author
-
M. Reza Hosseini, Mahmoud Shakouri, Saeed Banihashemi, and Hamed Golizadeh
- Subjects
Engineering ,Principal Component Analysis ,Environmental Engineering ,Dry-bulb temperature ,Meteorology ,Renewable Energy, Sustainability and the Environment ,business.industry ,Ecological Modeling ,Design of experiments ,Humidity ,Building loads ,Atmospheric sciences ,Energy performance ,Design of Experiment ,Wind speed ,Urban Studies ,Window ,Principal component analysis ,Emissivity ,business ,Parametric statistics ,Efficient energy use - Abstract
In line with the growing global trend toward energy efficiency in buildings, this paper aims to first; investigate the energy performance of double-glazed windows in different climates and second; analyze the most dominant used parametric and non-parametric tests in dimension reduction for simulating this component. A four-story building representing the conventional type of residential apartments for four climates of cold, temperate, hot-arid and hot-humid was selected for simulation. 10 variables of U-factor, SHGC, emissivity, visible transmittance, monthly average dry bulb temperature, monthly average percent humidity, monthly average wind speed, monthly average direct solar radiation, monthly average diffuse solar radiation and orientation constituted the parameters considered in the calculation of cooling and heating loads of the case. Design of Experiment and Principal Component Analysis methods were applied to find the most significant factors and reduction dimension of initial variables. It was observed that in two climates of temperate and hot-arid, using double glazed windows was beneficial in both cold and hot months whereas in cold and hot-humid climates where heating and cooling loads are dominant respectively, they were advantageous in only those dominant months. Furthermore, an inconsistency was revealed between parametric and non-parametric tests in terms of identifying the most significant variables.
- Full Text
- View/download PDF
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