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The present paper introduces a new smart building system driven by photovoltaic thermal panels. The concept is to improve the contribution of renewable energy in the local matrix for peak load shaving by having a two-way connection with the local electricity network via a rule-based energy monitoring control design. Besides, the feasibility of removing the electrical storage unit with high investment cost is studied by establishing a dynamic interaction between the energy production and usage components to reduce the energy costs over the year. The system has intelligent thermal energy storage integrated with an electrically-driven coil, heat exchanger, pumps, and several smart valves and control units. The transient system simulation (TRNSYS) package is implemented to assess the practicality of the suggested intelligent model for a building complex in Malmo, Sweden. According to the parametric outcomes, by raising the panel area, while the generated electricity increases, the solar utilization factor falls, indicating conflictive changes among performance metrics. The results also show that the renewable resource covers the building's heating and electricity demands for the majority of the year and that a significant amount of energy is sold to the neighbourhood electricity grid, demonstrating the viability of the introduced intelligent model., Conference paper; Export Date: 14 June 2023; Cited By: 0

Aquest TFG es basa en l'estudi de tota la xarxa d'aire comprimit d'alta pressió de l'empresa de Castellar Vidrio S.A., concretament a Zona Freda i al sistema de compressors. S'ha mirat de millorar l'eficiència d'aquest sistema d'aire comprimit reduint el cabal i la pressió de les màquines de Zona Freda que estiguessin en un règim de sobrepressió, així com realitzar un sistema alternatiu de buit per a les màquines paletitzadores. A més, es van readaptar els compressors a la nova demanda i s'ha generat una anàlisi econòmica per veure la rentabilitat del nou sistema. La memòria està adaptada a diferents seccions que divideixen les àrees d'estudi. Les principals subdivisions són: La màquina paletitzadora, la resta de màquines de Zona Freda i el sistema de compressors, Este TFG está basado en el estudio de toda la red de aire comprimido de alta presión de la empresa de Castellar Vidrio S.A., concretamente en Zona Fría y en el sistema de compresores. Se ha mirado de mejorar la eficiencia de este sistema de aire comprimido reduciendo el caudal y presión de las máquinas de Zona Fría que estuviesen en un régimen de sobrepresión, así como realizar un sistema alternativo de vacío para las máquinas paletizadoras. Además se readaptaron los compresores a la nueva demanda y se ha generado un análisis económico para ver la rentabilidad del nuevo sistema. La memoria está adaptada en diferentes secciones que dividen las áreas de estudio. Las principales subdivisiones son: La máquina paletizadora, el resto de máquinas de Zona Fría y el sistema de compresores., This Bachelors Thesis is based on the study of the entire high-pressure compressed air network of the Castellar Vidrio S.A. company, specifically in the Cold End Area and in the compressor system. In order to improve the efficiency of this compressed air system, we decided to go by reducing the flow and pressure of the Cold Zone machines that were in an overpressure regime, as well as creating an alternative vacuum system for the palletizing machines. In addition, the compressors were readapted to the new demand and an economic analysis was made to see the profitability of the new system. The memory is adapted into different sections that divide the study areas. The main subdivisions are: the palletizing machine, the rest of the Cold End Area machines and the compressor system.

Fibre-reinforced plastics (FRPs) are becoming increasingly important in aerospace and automotive applications. However, dry machining of FRPs generates abrasive and electrically conductive dust particles that can furthermore cause explosive dust-air mixtures in the enclosed workspace of the machine tool. In order to protect the machine operator and the machine tool, powerful extraction systems (engine power > 5 kW) are usually installed and operated with a constant flow rate, resulting in a significant increase of the machine tool’s overall energy requirement. This paper introduces a novel approach for a demand-oriented control of the flow rate to increase the energy efficiency of dust extraction systems. The objective of the developed control mechanisms is to maintain the maximum permissible dust limit with minimum energy demand. A low-cost dust sensor serves as a feedback system for the applied control mechanism. In a further stage, a force measuring platform was added to provide additional signals for an increased performance of the controlled system. To evaluate the presented approach, milling tests were carried out with carbon-fibre-reinforced plastic (CFRP). The experimental results show that the energy requirement can be reduced by up to 70%.

Магистерская диссертация включает в себя шесть основных разделов, введение и заключение, а также список использованных источников и пять обязательных приложений. Общий объём работы составляет 152 страницы. В представленном документе используется 41 иллюстрация, 23 таблицы и 90 источников. К работе прикладывается пять листов графических материалов. Разработка ведётся с использованием возможностей имитационного моделирования и известных методик расчёта фотоэлектрических систем. Объектом разработки является часть автономной системы энергоснабжения частного дома, а именно фотоэлектрическая установка. Целью работы является разработка системы автоматизированного управления фотоэлектрической установкой с повышенной энергетической эффективностью., Most of the power generated nowadays is produced using fossil fuels, which emit tons of carbon dioxide and other pollution every second. More importantly, fossil fuel will eventually run out. In order to make the development of our civilization sustainable and cause less harm to our environment, people are looking for new sources of substitute clean energy. After a system has been established, it will be very difficult to upgrade the systems or change the operation methods. In order to choose the right solar system for a specific geographic location, we want to understand and compare the basic mechanisms and general operation functions of several solar technologies that are widely studied.

The comparative analysis of power consumption of a pump unit with adaptive voltage control and without it is presented. The issues include the feasibility evaluation of application of the control in the considered application., В работе проведен сравнительный анализ энергопотребления электропривода насосного агрегата, с использованием адаптивной системы регулирования напряжения и без нее. Сделаны выводы относительно целесообразности применения данной системы регулирования в целевом приложении.

The method of evaluation of the combined measurement uncertainty of the motor efficiency, based on the uncertainties of electrical and mechanical power, is presented. Particular attention is paid to the evaluation of the shaft torque uncertainty as it is one of the most significant., В работе рассмотрен метод определения результирующей погрешности измерения КПД электродвигателя, на основе погрешностей электрической и механической мощностей. Особое внимание уделено определению погрешности момента на валу двигателя, так как она является одной из самых значительных.

Работа имеет целью экспериментальное сравнение конструктивных и энергетических характеристик современных асинхронных двигателей (АД) отечественного и зарубежного производства (ABB) и разработанного авторами синхронного реактивного двигателя (СРД) в составе частотно-регулируемого электропривода. Рассматриваемый в работе опытный образец двигателя спроектирован на основе статора АД. Результаты работы показывают, что применение СРД позволяет значительно повысить КПД частотно-регулируемого привода. При этом СРД может соответствовать самому высокому классу энергоэффективности IE4. В то же время конструкция двигателя остается простой и дешевой., The work is aimed at experimental comparison of constructive and energy characteristics of modern asynchronous electric motors of Russian and European manufacturers (ABB Ltd.) and the synchronous reluctance motor developed by the authors as a part of variable frequency drive. The prototype motor was designed based on the stator of an induction motor. The issues show that it is possible to significantly improve the efficiency of the variable frequency drive by use of a synchronous reluctance motor. The motor can correspond to the highest energy efficiency class IE4. At the same time the motor design is simple and cheap.

Desde que en el año 2000 se registró una cotización media de 25 céntimos de € para el litro del gasoil para la flota pesquera, la situación fue cambiando hasta que en el verano de 2008 se alcanzó un máximo histórico de 75 céntimos, lo que obligó al amarre de muchas unidades de producción por la falta de rentabilidad de la actividad extractiva, medida auspiciada por la Unión Europea. El precio del pescado en primera venta, establecido mediante subasta a la baja, determina finalmente si una marea es o no rentable. Pero la evolución de este precio ha sido muy variable en los últimos años, con fuertes caídas propiciadas en muchos casos por el descenso del consumo y la entrada de grandes cantidades de pescado de importación. Esta situación agudiza la permanente crisis de la flota pesquera gallega, profundamente afectada por la progresiva regulación del acceso a los caladeros tradicionales, y obligada a faenar cada vez con mayor frecuencia en caladeros lejanos, con el consiguiente aumento de la importancia del combustible en la cuenta final de los costes de explotación. En los últimos años se han puesto en marcha proyectos de investigación para tratar de conseguir buques más eficientes en consumo de gasoil, y acciones experimentales centradas en el empleo de combustibles alternativos, pero no ha habido avances relevantes a la hora de obtener el «pesquero eficiente»., Since the year 2000, when the average price was 25 Euro cent per litre of diesel fuel used by the fishing fleet, there was an overall upwards trend that culminated in the summer of 2008 when prices reached an all-time peak of 75 Euro cents per litre. This forced many vessels to tie up in port due to the lack of profitability of fishing operations, a measure that received the backing of the European Union. What finally determines whether a fishing expedition is profitable or not is the first sale price of the fish landed, established by the Dutch auction system. This price, however, has fluctuated greatly in recent years, with steep falls in many cases being the consequence of a drop in consumption and the arrival of large amounts of imported fish in the market. This situation has aggravated the permanent crisis affecting the Galician fishing fleet, hard hit by the progressive regulation of access to its traditional fishing grounds and forced to go further and further afield in search of catches, with the resulting rise in the importance of fuel as a factor in overall operating costs, and its effect on profitability. Research projects in recent years have focused on trying to make fishing vessels more efficient in terms of diesel consumption, and a number experiments have also been carried out into the use of alternative fuels, but no significant progress has yet been made towards obtaining an «efficient fishing vessel».

Desde que en el año 2000 se registró una cotización media de 25 céntimos de € para el litro del gasoil para la flota pesquera, la situación fue cambiando hasta que en el verano de 2008 se alcanzó un máximo histórico de 75 céntimos, lo que obligó al amarre de muchas unidades de producción por la falta de rentabilidad de la actividad extractiva, medida auspiciada por la Unión Europea. El precio del pescado en primera venta, establecido mediante subasta a la baja, determina finalmente si una marea es o no rentable. Pero la evolución de este precio ha sido muy variable en los últimos años, con fuertes caídas propiciadas en muchos casos por el descenso del consumo y la entrada de grandes cantidades de pescado de importación. Esta situación agudiza la permanente crisis de la flota pesquera gallega, profundamente afectada por la progresiva regulación del acceso a los caladeros tradicionales, y obligada a faenar cada vez con mayor frecuencia en caladeros lejanos, con el consiguiente aumento de la importancia del combustible en la cuenta final de los costes de explotación. En los últimos años se han puesto en marcha proyectos de investigación para tratar de conseguir buques más eficientes en consumo de gasoil, y acciones experimentales centradas en el empleo de combustibles alternativos, pero no ha habido avances relevantes a la hora de obtener el «pesquero eficiente»., Since the year 2000, when the average price was 25 Euro cent per litre of diesel fuel used by the fishing fleet, there was an overall upwards trend that culminated in the summer of 2008 when prices reached an all-time peak of 75 Euro cents per litre. This forced many vessels to tie up in port due to the lack of profitability of fishing operations, a measure that received the backing of the European Union. What finally determines whether a fishing expedition is profitable or not is the first sale price of the fish landed, established by the Dutch auction system. This price, however, has fluctuated greatly in recent years, with steep falls in many cases being the consequence of a drop in consumption and the arrival of large amounts of imported fish in the market. This situation has aggravated the permanent crisis affecting the Galician fishing fleet, hard hit by the progressive regulation of access to its traditional fishing grounds and forced to go further and further afield in search of catches, with the resulting rise in the importance of fuel as a factor in overall operating costs, and its effect on profitability. Research projects in recent years have focused on trying to make fishing vessels more efficient in terms of diesel consumption, and a number experiments have also been carried out into the use of alternative fuels, but no significant progress has yet been made towards obtaining an «efficient fishing vessel».