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Ground source heat pump with R744 refrigerant
Nevoral, Michal ; Bouchal, Patrik (referee) ; Hejčík, Jiří (advisor)
The aim of the thesis is to design a ground-water heat pump with refrigerant R744 for low temperature heating systems. The work is divided into two main parts. In the first part is ex-plaining the principle and distribution of the heat pump with the description of the individual components and the differences in refrigerants. In the practical part, the refrigerant cycle of the heat pump is designed and calculated. After optimizing of the calculation, individual components, the electrical parts and the construction of the heat pump are designed.
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Modern technologies for air conditioning and cooling
Ganczner, Dominik ; Tuhovčák, Ján (referee) ; Lízal, František (advisor)
This thesis provides an overview of modern air conditioning and cooling technologies. Topics of this thesis include different thermodynamic cooling cycles, refrigerants, main components used in air conditioning and cooling units, and a selection of today’s advanced technologies in the field. Furthermore, a selection of discussed technologies are compared to give an idea of their theoretical effects on efficiency.
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Survey of the use of propane as refrigerant R290 in cooling circuits and heat pumps
Aminian, Ali ; Prokopová, Olga ; Vinš, Václav
The technical report presents a review on the application of propane as refrigerant R290 in cooling circuits and heat pumps (HVAC). Safety risks of R290 used in HVAC are addressed according to ANSI/ASHRAE and EN standards. Comparison of thermophysical properties of propane with other refrigerants, solubility and miscibility of propane in compressor oils and heat transfer in condenser and evaporator are discussed. The main aim of the study is to provide an overview about the potential use of propane in the cooling circuit and heat pump for the hydrogen bus developed by the SOR Libchavy company.
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Heat transfer analysis of phase-change process in tubular exchanger
Fečer, Tomáš ; Bašta,, Jiří (referee) ; Kabele,, Karel (referee) ; Plášek, Josef (advisor)
The system HVAC is frequently based on cyclic phase change of boiling fluid. This phase change of boiling fluid (liquid-gas or gas-liquid) is coupled with boiling heat transfer by nucleate boiling, convective boiling and pre/post dryout effect. The nucleate boiling is depended on superheat of wall (i.e. heat flux) and presence of active nucleation sites. The two-phase convection boiling with dependence on mass flux and vapour quality is performed in liquid film between superheated wall and vapour core. The pre/post dryout effect is significant, when the liquid film is consumed and superheated wall is exposed directly to vapour core. This boiling heat transfer by nucleate boiling, convective boiling and pre/post dryout effect is simplified for engineering design on boiling heat transfer coefficient. Therefore, the dissertation thesis is aimed at experimental analysis of phase-change process in advanced engineering design.
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Heating and cooling systems in a multifunctional building
Fuksa, Lukáš ; Horák, Petr (referee) ; Formánek, Marian (advisor)
The master´s thesis is about the design of heating and cooling of a multifunctional house. The building is functionally divided into parts of shops, administration and apartments. Thesis describes various cooling options and basic types and functions of air conditioning systems. Three variants of the system at the level for expanded building permits and their evaluation are developed. The selected variant is developed at the project level for the construction.
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Design of heat pump
Daxner, Ján ; Lachman, Jakub (referee) ; Toman, Filip (advisor)
The aim of this thesis is to design the main components of the heat pump on the basis of specified parameters. The first theoretical part is an introduction to the problem of heat pumps. It describes types of heat pumps, energy sources and their advantages and disadvantages. In the second calculation part, the calculation was performed according to the entered parameters on the basis of which the heat pump components were suitably selected.
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The flow analysis inside semi-hermetic reciprocating compressor
Bouchal, Patrik ; Hejčík, Jiří (referee) ; Tuhovčák, Ján (advisor)
The topic of this diploma thesis is CFD simulation of flow inside CO2 semi-hermetic reciprocating compressor Stream manufactured by Emerson. The goal of this thesis is to analyze critical points inside the compressor with regard to excessive entrainment of oil by flowing refrigerant by means of CFD simulation using ANSYS CFX. Simulation for both single-phase and two-phase flow is part of the thesis and results from them are analysed.
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eating of the veterinary clinic
Němečková, Šárka ; Blasinski, Petr (referee) ; Počinková, Marcela (advisor)
The aim of this bachelor thesis is a processing of a project regarding heating system and warm water production for the veterinary clinic. The building has two overground floors and flat roof. A source of the heat for the building is an air-water heat pump. Heating surfaces are panel radiators. There is natural ventilation in the building mostly.
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