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Industrial heat pump for the cooling circuit
Odehnal, Lukáš ; Kudela, Libor (referee) ; Kracík, Petr (advisor)
This thesis deals with the design of an industrial heat pump for the cooling circuit of a thermal power plant. The aim of the thesis is to analyze and optimize different heat pump technologies, especially compressor and absorption heat pumps, and their application to a specific case. The advantages and disadvantages of different working substances and their influence on efficiency and environmental impact are discussed. The chosen working substance for the compressor HP is the refrigerant R152a and for the absorption HP it is the water-lithium bromide solution. The design of the compressor HP consists of two parts, namely the design of an ideal cycle with a resulting heating factor of 3.81 and the subsequent revalidation with a resulting heating factor of 3.18. The revalidation is carried out under the design of the key components, where the resulting power input at the evaporator is 21.18 MW and the power output through the condenser to the CHSS system is 29.5 MW with an electrical input of the compressor of 9.27 MW. The second proposed absorption HP unit discharges 23.2 MW of thermal power to the CHSS system with a heating factor of 1.48 with an input circulating power of 43.37 MW and input power to the evaporator identical to that of the compressor. The absorption HP design also includes the use of a heat recovery heat exchanger, which increases the overall heating factor to 1.6 and reduces the delivered driving power to the cycle to 34.7 MW. The following is a comparison of the proposed HP units with their suitability depending closely on the specific operational options. The resulting cash flow for both options shows positive values, namely 347.1 million CZK for the compressor option and 209.1 million CZK for the absorption variant.
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Refrigeration unit with the R718 refrigerant
Krupa, Matyáš ; Tuhovčák, Ján (referee) ; Hejčík, Jiří (advisor)
The diploma thesis deals with the design of a cooling system using the refrigerant R718 (water) with a capacity of 5 kW for building cooling. The thesis is divided into three chapters. The first chapter describes the basic principles of cooling systems, thermodynamic cycles, and refrigerants. The following second chapter provides an analysis of the compressor cycle and its individual components – compressor, heat exchangers, and expansion valve. The final third chapter focuses on the actual design of the cooling system, including thermodynamic calculations and determining the basic geometric parameters of the compressor.
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Steam boiler burning fytomass waste
Plot, Rostislav ; Skála, Zdeněk (advisor)
This thesis deals with the calculation of the boiler on stillage. Nowadays, when there's fossil fuels are just biomass seems adequate compensation. The great advantage of biomass boilers is a small amount of emissions, especially the greenhouse gas CO2. Of a given fuel composition is made thermal calculation and dimensioning of heat transfer surfaces of steam boilers. The resulting calculation must follow the parameters of steam at the outlet from the boiler.
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Steam boiler for spruce bark burning-18t/h
Dračka, Lukáš ; Heinze, Bedřich (referee) ; Skála, Zdeněk (advisor)
To design a grate boiler with a natural circulation for burning of a pine bark with an output 18t/h is a primary objective of this dissertation. Individual parts of a boiler and it´s heat transfering surfaces were calculated after the working out of stoichiometric calculations from given element analysis of fuel. All computations have to fulfill several parameters: boliler output, temperature and pressure of an overheated steam.
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Refrigeration systems in the food industry
Dvořák, Josef ; Katolický, Jaroslav (referee) ; Štětina, Josef (advisor)
Bachelor´s thesis is aimed at refrigeration systems in the industry which are used mainly in the food industry. Here are described individual parts that are refrigeration systems assembled. The work also contains summary of the ways you can make use of waste heat and also factors that have impact on economy of operation. The aim of work is to describe the basic analysis of thermodynamic cycles in the refrigeration systems which are displayed on the illustrative diagrams.
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Stean boiler for sub bituminous coal, steam parametres 235 t/h, 14 MPa, 540°C
Horák, Stanislav ; Moskalík, Jiří (referee) ; Baláš, Marek (advisor)
The aim of the work is to design a brown coal combustion boiler of 235 t/h output. The work is divided into several parts. First, stechiometric calculations and calculations enthalpy of air and flue gas are performed. It is calculated heat balance of the boiler, the boiler losses and the thermal efficiency of the boiler is determined. After designing the combustion chamber thermal calculation is made. Then, individual heating surfaces are proposed and at the end of the calculations are controlling the overall energy balance of the boiler. For calculation was design documentation added.
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steam boiler for woody biomass 88t/h
Lučko, Martin ; Ing.Milan Ryšavý (referee) ; Skála, Zdeněk (advisor)
The aim of the work is to design a plain wood combustion boiler of 88 t/h output. Fuelling component analysis has been added to the basic boiler parameters. For given fuel is prepared stechiometric calculations. After making the heat balance of boiler is determined the thermal efficiency. For given output of steam parametrs (temparature, pressure, volume) are designed individual convective surfaces and dimensons of the boiler. It is also made drawings.
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Grate Boiler for Coal and Bagasse Combustion - 200 t/h, 9.3 MPa, 520 °C
Bartůněk, David ; Ryšavý, Milan (referee) ; Skála, Zdeněk (advisor)
The object of the thesis is to design a grate boiler for bagasse and brown coal combustion with a heat output of 160 MW. Calculations of a flue gas stoichiometry are based on known element analyses of each fuel. The crucial part of the thesis includes designs of heat-exchanging surfaces, where the bagasse is considered as the main fuel while the brown coal is the spare one. Overall thermal balance and an actual boiler efficiencies are provided in last chapters. The boiler-outlet flue gas temperature is compared with the dew point temperature at the very end of the thesis. As a part of the thesis there is a design of the boiler attached.
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