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Wind Energy Use on Flat Roofs of Buildings
Tůmová, Eliška ; Kabrhel,, Michal (referee) ; Horák, Petr (referee) ; Hirš, Jiří (advisor)
The PhD thesis is focused on determination of the method by which it is possible to specify the wind energy use potential on building flat roofs. In response to the need to reduce the production of CO2 emissions and increase energy self-sufficiency, it is necessary to use alternative energy supply systems and renewable resources as much as possible. Long-term and short-term wind parameters were measured to verify the of the resulting simulation velocity flow images. Based on the defined input parameters and the completed simulation, the resulting value of the potential is determined, namely the possible production of electricity for selected small wind power plants on the roof of the selected building during one year. In the thesis the individual steps of the method are stated and the verification of the established method is determined.
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Use of nanofiber filter for air filtration
Straka, Petr ; Hlaváč,, Jaroslav (referee) ; Kabrhel,, Michal (referee) ; Malá, Jitka (advisor)
The doctoral thesis „Using of nanofiber filter for air filtration“ is focused on application of nanofiber filter for air filtration under demanding conditions of water supply facilities. The main aim of the filter application is to decrease the secondary contamination of the indoor environment of the water accumulation tanks. The nanofiber filters are distinguished by high filtration efficiency of pollutants, dust particles and organic impurities. The contaminants don´t have to be unhealthy but they can be used for spore and microorganisms delivery to the system. They are served frequently as a reproduction substrate of microorganisms. All these factors negatively affect the water quality. The research includes formation of suitable testing methodology, pilot unit construction and operation, short-term testing and evaluation of nanofiber filters and commonly used filters and long term testing and verification of nanofiber filter attributes and quality. Furthermore the filter´s characteristics and filtration efficiency for characteristic pollutants were evaluated. Short-term and long-term experimental testing proved suitability of nanofiber filters use in water supply facilities. Interception of reported pollution indicators was reported on similar or higher level for application of nanofiber filter than for application of commonly used filter. Measured values of higher pressure difference of nanofiber filter were indicated as still adequate for use in water supply facilities. No operation difficulties, failures neither filter´s damage were reported during testing of nanofiber filters.
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ENERGY MANAGEMENT STRATEGY FOR SUSTAINABLE REGIONAL DEVELOPMENT
Hrubý, Martin ; Korytárová, Jana (referee) ; Kabrhel,, Michal (referee) ; Petráš,, Dušan (referee) ; Hirš, Jiří (advisor)
Energy Management strategy for sustainable regional development has been selected as the topic of my research due to the fact that energy demand alongside with energy dependency have been continuously growing from a long term perspective. Sustainable development is defined by three imperatives – energy efficiency, ecology and security. Review of the current state and analysis of historical trends in Energetics at global and regional level are covered in this research. Results of the Multi-Criteria Decision Analysis introduce a set of implications and recommendations for Energy Management strategy in the Czech Republic.
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Using Low Temperature Energy Sources for Ventilation Systems in Residential Buildings
Adam, Pavel ; Košičanová,, Danica (referee) ; Horák, Petr (referee) ; Kabrhel,, Michal (referee) ; Hirš, Jiří (advisor)
The theoretical part deals with three “ventilation systems” (VS). The first VS uses a ground/well temperature potential as a energy source for preheating or cooling fresh ventilation air. It was found out that energy savings can be achieved. In the winter, when the air flow volume was considered 150 m3/hr and ground temperature 4 and 8 ° C, the energy savings are in the range of 227-359 kWh. The electricity increase is 6 kWh of energy. In the summer, the energy savings are 17 to 38 kWh, with the electricity increase 8 kWh of energy. The second VS, i.e. system combining ventilation a solar systems, the calculation was carried out in TRNSYS computer program for two objects - a “low-energy house” (LEH) and “two-floor house” (TFH) - and 6 different solar systems modifications. The energy gains at the LEH for the 3 solar modif. are 49, 59 and 46 kWh per year (yearly consumption for heating is 2622 kWh). The energy gains at the TFH for the 3 solar modif. are 86, 134 and 129 kWh (yearly consumption for the heating is 8988 kWh). The third VS is a residential VS with liquid circuit with two compact “heat exchangers” (HE) at the inlet and outlet air. The results shows (compared to VS without heat recovery) that with the air flow volume 150 m3/h the energy savings in the winter are 1761-3148 kWh (16-hour and 24-hour operation mode). The electr. increase is 173 to 262 kWh of energy. In the exp. research the measuring section for the HE measuring was built. Then the conventional materials HE was measured. Is was found out that the selected HE is suitable for installation of the theoretically proposed systems. Its efficiency is in the range 58 - 82 % (with the air flow volume 570-55 m3/h). Measuring section was optimized and measured various hollow fibre HEs. Their efficiency are in the range 38-63 % (with the air flow volume 300-900 m3/h). Results of CO2 measurements shows that CO2 concentration is close to the value of 5000 ppm. It is much higher than max. allowed value 1200
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Use of nanofiber filter for air filtration
Straka, Petr ; Hlaváč,, Jaroslav (referee) ; Kabrhel,, Michal (referee) ; Malá, Jitka (advisor)
The doctoral thesis „Using of nanofiber filter for air filtration“ is focused on application of nanofiber filter for air filtration under demanding conditions of water supply facilities. The main aim of the filter application is to decrease the secondary contamination of the indoor environment of the water accumulation tanks. The nanofiber filters are distinguished by high filtration efficiency of pollutants, dust particles and organic impurities. The contaminants don´t have to be unhealthy but they can be used for spore and microorganisms delivery to the system. They are served frequently as a reproduction substrate of microorganisms. All these factors negatively affect the water quality. The research includes formation of suitable testing methodology, pilot unit construction and operation, short-term testing and evaluation of nanofiber filters and commonly used filters and long term testing and verification of nanofiber filter attributes and quality. Furthermore the filter´s characteristics and filtration efficiency for characteristic pollutants were evaluated. Short-term and long-term experimental testing proved suitability of nanofiber filters use in water supply facilities. Interception of reported pollution indicators was reported on similar or higher level for application of nanofiber filter than for application of commonly used filter. Measured values of higher pressure difference of nanofiber filter were indicated as still adequate for use in water supply facilities. No operation difficulties, failures neither filter´s damage were reported during testing of nanofiber filters.
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ENERGY MANAGEMENT STRATEGY FOR SUSTAINABLE REGIONAL DEVELOPMENT
Hrubý, Martin ; Korytárová, Jana (referee) ; Kabrhel,, Michal (referee) ; Petráš,, Dušan (referee) ; Hirš, Jiří (advisor)
Energy Management strategy for sustainable regional development has been selected as the topic of my research due to the fact that energy demand alongside with energy dependency have been continuously growing from a long term perspective. Sustainable development is defined by three imperatives – energy efficiency, ecology and security. Review of the current state and analysis of historical trends in Energetics at global and regional level are covered in this research. Results of the Multi-Criteria Decision Analysis introduce a set of implications and recommendations for Energy Management strategy in the Czech Republic.
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Using Low Temperature Energy Sources for Ventilation Systems in Residential Buildings
Adam, Pavel ; Košičanová,, Danica (referee) ; Horák, Petr (referee) ; Kabrhel,, Michal (referee) ; Hirš, Jiří (advisor)
The theoretical part deals with three “ventilation systems” (VS). The first VS uses a ground/well temperature potential as a energy source for preheating or cooling fresh ventilation air. It was found out that energy savings can be achieved. In the winter, when the air flow volume was considered 150 m3/hr and ground temperature 4 and 8 ° C, the energy savings are in the range of 227-359 kWh. The electricity increase is 6 kWh of energy. In the summer, the energy savings are 17 to 38 kWh, with the electricity increase 8 kWh of energy. The second VS, i.e. system combining ventilation a solar systems, the calculation was carried out in TRNSYS computer program for two objects - a “low-energy house” (LEH) and “two-floor house” (TFH) - and 6 different solar systems modifications. The energy gains at the LEH for the 3 solar modif. are 49, 59 and 46 kWh per year (yearly consumption for heating is 2622 kWh). The energy gains at the TFH for the 3 solar modif. are 86, 134 and 129 kWh (yearly consumption for the heating is 8988 kWh). The third VS is a residential VS with liquid circuit with two compact “heat exchangers” (HE) at the inlet and outlet air. The results shows (compared to VS without heat recovery) that with the air flow volume 150 m3/h the energy savings in the winter are 1761-3148 kWh (16-hour and 24-hour operation mode). The electr. increase is 173 to 262 kWh of energy. In the exp. research the measuring section for the HE measuring was built. Then the conventional materials HE was measured. Is was found out that the selected HE is suitable for installation of the theoretically proposed systems. Its efficiency is in the range 58 - 82 % (with the air flow volume 570-55 m3/h). Measuring section was optimized and measured various hollow fibre HEs. Their efficiency are in the range 38-63 % (with the air flow volume 300-900 m3/h). Results of CO2 measurements shows that CO2 concentration is close to the value of 5000 ppm. It is much higher than max. allowed value 1200
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