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Heat pump system for waste heat utilization
Toman, Filip ; Hejčík, Jiří (referee) ; Bobák, Petr (advisor)
The aim of this thesis is determination of the configurations and parameters of the system for heat recovery from waste water from washing machines with a heat pump. The first part of the thesis deals with the principle and construction of heat pumps and the use of heat from waste water. The second part of the thesis deals with the construction of the system for preheating of clear water which flows to washing machines. The main section of the second part of the thesis is the design of the heat pump with evaluation of the proposed solution.
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Economy of ventilation units
Kratochvila, Lukáš ; Pech, Ondřej (referee) ; Hejčík, Jiří (advisor)
This bachelor’s thesis discuss methods of comparing air handling units from the economy of operating stage aspect. Introductory chapters have research character and they are about ventilation and air handling units. In further chapters, there are described and demonstrated 3 methods for comparing units. These methods are compared in the conclusion.
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Ice maker with direct evaporation
Loibl, Jan ; Hejčík, Jiří (referee) ; Pospíšil, Jiří (advisor)
The theoretical part of the diploma thesis deals with introduction to the issue of refrigeration systems with thermal energy storage. Possibilities of thermal energy storage with phase change are introduced. The thermodynamic principle of functioning of the particular refrigeration system type is explained here as well as its coefficient of performance and fundamental components. In addition, several examples of ice-making systems are discussed. In the practical part the design of a particular refrigeration system is calculated. The main part of the design is the cold evaporator with direct evaporation and the possibility of ice production and its usage for thermal energy storage. The calculation of the overall two-phase heat transfer is carried out.
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Water chiller for ceiling cooling system
Havlíček, Jan ; Chovancová, Michaela (referee) ; Hejčík, Jiří (advisor)
The topic of this diploma thesis is to design water chiller for ceiling cooling system. The thesis is divided into four main parts. The first part deals with the theoretical description of emitting cooling systems. The following part focuses on the theory of refrigerating systems and describes especially the thermal cycle and refrigerants which are used in cooling systems. In the third chapter refrigerating equipment are described. Compressor, heat exchangers and expansion valves belong to the main parts of refrigerating systems. The final chapter is devoted to the draft and selection of components of the refrigerating system.
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Family house energy requirements audit
Němec, Miloš ; Hejčík, Jiří (referee) ; Fišer, Jan (advisor)
The bachelor’s thesis deals with a comparison of several modifications of the terraced house, which should reduce the final energy requirements. For this purpose National calculating tool is applied, which complies with Czech government regulation no. 148/2007 Coll. In conclusion, individual modifications are evaluated accordely to energy savings and simple return on investments.
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Computational model of heat cycle of Stirling engine
Horák, Jiří ; Hejčík, Jiří (referee) ; Jedelský, Jan (advisor)
This Bachelor´s Thesis deals with heat circulation of a Stirling engine according to the Schmidt theory. In the first part of the thesis there is a short view and characteristic of computational methods for Stirling engine and there are also a few computational models illustrations. The second part describes the Schmidt idealization and its process within the program environment. The final part of the thesis is focused on the realization of the optimal parameters design using a computational model as well as on the comparison of theoretical results with real measured value.
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Warm air heating
Brázda, Jan ; Hejčík, Jiří (referee) ; Charvát, Pavel (advisor)
BRÁZDA Jan: Warm air heating The aim of this bachelor thesis is elaboration the different ways of hot air in buildings and then make a comparison with other methods of heating buildings.
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HVAC in a production plant
Černík, Václav ; Hejčík, Jiří (referee) ; Charvát, Pavel (advisor)
This master’s thesis deals with heating and HVAC in production plant ELMET, spol. s r.o. The first part of the thesis concerns reconstruction of the central heating system, which is outdated and unreliable in the time of the writing of the thesis. The second part deals with cooling of mounting of electronics, where technological requirements are not met due to summer overheating. The third part of the thesis concerns ventilation of metalworking hall using waste heat from production machines.
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Smartphones as experimental tools to take measurements in environmental engineering
Bernard, Jan ; Hejčík, Jiří (referee) ; Jedelský, Jan (advisor)
The thesis is focused on the measuring of the physical quantities by the means of smartphones. It gives a list of the sensors which smartphones contain and it briefly describes their function in ordinary use and their use for the measuring not only physical quantities. Sensors of the mechanical quantities are documented in a greater extent. The measurement limits are addressed as well as the information what inaccuracies of measured quantities can be expected. The study also deals with the added devices which help to overcome the limits of inbuilt sensors and by that they make the measurement more accurate. A review of several researches on already made measurements of the mechanical quantities with smartphones is also given. The last part of the study describes an experiment during which six mobile phones with Android system and six applications were tested by measuring a pink noise signal. Two main facts follows from the results. The measurement with a phone calibrated previously cannot be considered as reliable, the errors can be in the rate of tens of decibels. Whereas phones after calibration in the levels range 45 – 85 dB, when the measuring error is linear, can be used for measurement of the noise with the error less than 2 dB.
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