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Icing on radiator used for heat pump for EV vehicles
Ostroukhov, Andrei ; Růžička, Marek (referee) ; Bazala, Jiří (advisor)
Tato práce je zaměřena na vliv kondenzace na přenos tepla chladičem elektromobilů. Teoretická část popisuje princip systému tepelného čerpadla a obsahuje také popis přenosu tepla v radiátoru a kondenzace na jeho povrchu. Práce popisuje řešení pro snížení množství kondenzátu, byly demonstrovány různé metody. Byl také popsán proces vzniku námrazy, tvorby ledu na povrchu výměníku tepla a také byli popsané mechanická poškození způsobené námrazou. V praktické části bude použit simulační software pro porovnání množství kondenzátu, který se objeví na povrchu výměníku tepla při použití některých níže popsaných metod. Simulace také určí závislost tepelného toku na množství kondenzátu.
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Design of a cryogenic exchanger for process gas liquefaction
Wittek, David ; Kudela, Libor (referee) ; Toman, Filip (advisor)
The energy density of liquid natural gas is more than five hundred times higher than in state of gas. A key component for its preparation is the heat exchanger, where the liquefaction takes place. The aim of this work is design of a condenser. Its implementation is like Giaque-Hampson type exchanger with a bundle of helical wound tubes. Technical solution for the device is proposend and various configuration of heat-carryig media placement are compared. Concepts with condensation inside the tubes and in the shell are studied. In addition to ensuring safe operation within the design conditions, there are fucused on minimizing the size of the equipment and the associated production costs.
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Low temperature heat exchanger
Křivánek, František ; Toman, Filip (referee) ; Hejčík, Jiří (advisor)
The aim of this work is to design a low-temperature heat exchanger for a lyophilization device. The theoretical part of the work includes a basic description of lyophilization technology, a literature review of heat transfer at low temperatures with a focus on suitable construction materials and heat transfer fluids, and an overview of utilized heat exchanger designs. The practical part of the work deals with the actual design of the heat exchanger for indirect cooling in two variants, one of which utilizes a direct vaporization system of the heat transfer fluid, while the other focuses on purely liquid cooling.
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Feedwater heater design
Holčapek, Josef ; Tomáš,, Zdeněk (referee) ; Skála, Zdeněk (advisor)
This diploma thesis deals with the design of a feedwater heater. The aim of the work is to perform thermal, hydraulic and stress analysis. A preliminary technical documentation is also part of this work. The first part contains a summary of basic types of heat exchangers and processes of heat transfer. The main part is focused on thermal analysis to determine the main parameters of the heat exchanger. Next part is followed up by hydraulic analysis to determine the pressure drop of the heating water. After that is created design of heat exchanger with stress analysis of the proposed wall thicknesses of the shell, water chambers and tubesheet. Achieved results are summarized and evaluated at the end of the diploma thesis.
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Calculations of steam condensers
Mifek, Roman ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
This thesis deals with the calculation procedures for determining the heat transfer coefficient for steam condensers. The first section provides a basic overview for industrial steam condensers and possible procedure for selecting the appropriate type of tube condenser. The next section describes the types of condensation and equations for determining the heat transfer coefficient for various geometries of tubular condensers. In the final section there is performed practical calculation of condenser in Maple software using the above relations. The results obtained in this calculation are compared with the results obtained by professional computational software Chemcad and HTRI.
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Air-cooled condenser
Kloda, Michal ; Jaroslav, Sinecký (referee) ; Pospíšil, Jiří (advisor)
The Master’s thesis dealing with air-cooled condensers is split into four sections. The first section shows an overview of air cooling, introduction into air-cooled condensers of A-frame shape and finned tubes. The second section deals with heat transfer on the steam side and deals with trapped incondensables on the steam side of ACC. The third section deals with heat transfer on the air side, shows a brief overview of fans and selected problems on the air side. In the last section the simplified thedmodynamic calculation of air-cooled condenser is shown.
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Expansion valve replacing with the capillary tube
Devečka, Viktor ; Tuhovčák, Ján (referee) ; Hejčík, Jiří (advisor)
V súčasnosti sa kladie veľký dôraz na znižovanie produkcie emisií, čistotu a kvalitu životného prostredia. Tieto trendy sa týkajú všetkých odvetví, tak isto aj stavebného priemyslu a vykurovania budov. Doposiaľ bolo najrozšírenejším typom vykurovania spaľovanie fosílnych palív. Do popredia sa však dostávajú tepelné čerpadlá a začínajú zaberať výrazný podiel trhu. Kvôli dopytu po tepelných čerpadlách vzrastá počet výrobcov a konkurencia. Cieľom výrobcov je zvyšovanie účinnosti tepelných čerpadiel a zároveň znižovanie výrobných nákladov na dosiahnutie lepšej pozície na trhu. Predložená práca sa zaoberá procesmi prebiehajúcimi v chladivovom okruhu tepelného čerpadla. Skúma správanie chladiva počas kondenzácie a možnosti zvýšenia účinnosti tepelného čerpadla. Zvýšenie účinnosti je dosiahnuté podchladením chladiva počas kondenzácie na zvýšenie tepelných ziskov. To je dosiahnuté zaradením druhého elektronického expanzného ventilu za kondenzátorom. Táto technológia je však finančne náročná. Práca sa zaoberá výpočtom kapiláry na základe praktických meraní, ktorá bude zadržiavať chladivo v kondenzátore a bude plniť podobnú úlohu ako expanzný ventil. Následne sú porovnané výsledky jednotlivých meraní. Výsledky sú porovnané voči jednoduchému systému, kde nedochádza k podchladeniu chladiva. V závere práce je analýza výsledkov jednotlivých systémov.
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Separation of water drops from jet of steam
Miček, Michal ; Baláš, Marek (referee) ; Pospíšil, Jiří (advisor)
This thesis is focused on separation water drops from jet of steam. Liested are some of basic principles of separation of moisture and particles, as well as equipment, which are using these principles. Furthemore, this thesis include the part devoted to water drop formation during condesation of vapor. Last part is focused on the design of cyclone separator.
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Use of Renewable Energy Sources for Water Recovery
Patera, Jan ; Vojtek, Martin (referee) ; Baxant, Petr (advisor)
The bachelor's thesis deals with a summary of the basic theory for obtaining water from air humidity and it‘s following treatment in order to meet the hygienic regulations of drinking water. It presents the basic principles usable for obtaining water from the air, also presents the basic principles, including a basic overview of existing equipment for obtaining water from the air. It defines ideal conditions for obtaining water using atmospheric water generators. In a specific locality is determined a proposal for the water yield with energy performance during the year. Furthermore, the work deals with the use of renewable resources in obtaining water and the possibility of its subsequent treatment.
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Hygrothermal processes in walls of wooden houses
Veselá, Lucie ; Vlach, František (referee) ; Bečkovský, David (advisor)
The diploma thesis deals with the thermal-humidity stress of the wooden wall. The work is focused on the connection of the wall to the base structure of the building. Three details were chosen. The work was focused on detail with the most common structure of an external wall used in the Czech Republic on the composition with a supporting structure made of KVH columns, which are filled with mineral insulation. This construction is covered with plate elements. The insulation from the exterior is made of ETICS with expanded polystyrene thermal insulation. This detail was assessed in the software. To compare the results calculated by real-time software, an experimental model was made, which was subjected to experimental measurements. Part of the diploma thesis is a comparison of detail stress under different boundary design conditions, with or without anchoring.
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