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Airconditioning for expectoral beds in a hospital building
Snášel, Michal ; Uher, Pavel (referee) ; Rubina, Aleš (advisor)
The topic of this Bachelor thesis is a design of two air handling units for Emergency Room and nearby surroundings in the hospital’s area. The devices are designed to meet the operating, hygienic and functional requirements for internal microclimate. The tasks for these devices are air conditioning, coverage of heat loss, venting the thermal load and moisturizing the air. The theoretical part is focused on air handling units and their parts.
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Deformation and damage of tube bundle bends due to temperature
Michálková, Anežka ; Pernica, Marek (referee) ; Létal, Tomáš (advisor)
This master’s thesis deals with the problem of determining the thermal load of cross-flow tube bundle bends in steam superheater. Firstly, the theoretical basis of computational fluid dynamics and finite element method is introduced, and the possible methods of creep damage evaluation are presented as it was assumed that creep damage would be the most significant damage mechanism. The next part of this thesis describes simulations in ANSYS Fluent to determine values of heat transfer coefficients and ANSYS Mechanical to obtain temperature field and stresses. Based on the determined temperature field and stresses, a creep lifetime calculation according to ČSN EN 12952-4 is performed. Then creep design check for operating time 200 000 hours was carried out according to ČSN EN 13445-3. It was determined that in this case the tube bends are not the critical spot in comparison with the straight sections of tubes.
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Studying the behavior of high strength concrete at high temperatures
Sovová, Kateřina ; Kirnbauer, tech Johannes (referee) ; Bodnárová, Lenka (advisor)
This master’s thesis is divided into two parts; practical and theoretical. The theoretical part of this study describes the influence of high temperature on concrete structure and chemical, mechanical and physical changes, which take place during the exposure to high temperatures. The thesis also evaluates spalling of concrete and the methods to prevent it, as well as the function of polypropylene and cellulose fibers in the concrete. The practical part deals with design, production and testing of the cement-based concrete with the use of different fibers (polypropylene fibers and cellulose fibers). The properties and the means of applications in high temperatures are also included. The practical part also assesses the influence of high temperature on strength, porosity, visual changes of specimens, changes of surface and degradation of testing specimens due to heat loads according to normative heat curve (ISO 834) and also according to hydrocarbon curve. For clearer arrangement, the experimental tests are divided into two parts and the measured values are evaluated at the end of each part. The conclusion resumes all data obtained by testing and evaluates what is the most suitable formulation. The approach for further research is also discussed.
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Design of air conditioning system of a flat
Vrbický, Jiří ; Zerzaňová, Alena (referee) ; Hejčík, Jiří (advisor)
The diploma thesis is consisting of theoretic part, which deal with used ventilating systems, ways of waste heat recovery and describe basic types of air-conditioning systems. Following part attend to design of ventilating system and multi-split air-conditioning system for flat. Part of design of ventilation system is calculation of noise levels in rooms. Air-conditioner design is based on calculation of thermal stress. Annual demand of cold and heat demand are calculated using TRANSYS software. Design documentation is part of the diploma thesis.
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Air conditioning of swimming pool
Bachmayer, Milan ; Andrys, Petr (referee) ; Rubina, Aleš (advisor)
The objective of this bachelor thesis is a concept of device handling swimming pool hall in Brno. The device is designed to meet internal microclimate requirements. Task of air condition device is venting, heat adjusting and moisturizing. Theoretical part of the thesis is devoted to air conditioning units, their division, structure and desccription of basic selected components.
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Behavior of concrete at high temperatures
Dvořáková, Michaela ; Bruckner,, Dipl Heinrich (referee) ; Bodnárová, Lenka (advisor)
The aim of this diploma thesis is to focus on the resistance of concrete exposed to high temperatures especially with focus of resistance against explosive spalling as well as clarifying the mode of action of various types of polypropylene fibres. The theoretical part is an introduction to the issues of explosive spalling, its mechanisms and majority influencing factors. Further description of the processes taking place in the structure of concrete under extreme thermal load, distribution and size of pores in concrete, thermal load, temperature-time curves and their applications, methods of elimination of negative behaviour of concrete exposed to thermal loading (passive and active methods), mode of action of polypropylene fibres and more is also included in the theoretical part. The main aim of experimental part is to verify the function of polypropylene fibers of various Melt Flow Indexes (MFI) and dosage. Primarily, the test samples with content of the PP-fibers are compared to the reference sample without fibers. Secondarily, the samples with standard PP-fibers (with MFI 25) with dosage 2.0 kg/m3 are compared to samples with modified PP-fiber (with MFI 2500) of dosage 0.9 kg/m3. Photogrammetric images were used for evaluation and comparison of spalled surfaces and its depth. Determination of the softening temperature and melting point of the modified and standard PP-fibers was made by using a high temperature microscope video. The second part of the experimental work was to define concrete permeability at different temperatures and pressures. Permeability was measured at temperatures of 20°C, 90°C, 150°C, 175°C, 200°C, 225°C and 250°C and at pressure of 0.2, 0.4 and 0.6 MPa.
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Design of Cooling system in family house
Jirsová, Tereza ; Šíp, Jan (referee) ; Pech, Ondřej (advisor)
The bachelor thesis is focused on the design of cooling system in family house that is intended for potential building-up. The introductory chapter deals with the most common ways of a cooling systems in a family houses, using mainly split and multi-split air conditioning units and heat pumps. The following chapter shortly describes the family house, its orientation on the land and the parameters of the building structure. In the next chapter, there is calculated the heat load for the living room and also there are the results for the other rooms that should be cooled. In the last chapter there are created two different designs of possible ways of cooling and also the financial costs for purchase, assembly, operation and revisions are compared. The first design deals with the installation of two multi-splits. In the second design, the Samsung TDM heat pump was installed. This heat pump is the first in Europe, that can operate with one outdoor unit A2W and also A2A. At the end of this thesis, there are more detailed results of heat load calculations and drawings of individual designs of cooling.
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Pedestrian bridge across the river Labe
Libiger, Martin ; Trenz, Jan (referee) ; Nečas, Radim (advisor)
The thesis deals with a design of the river Labe bridging in the city Hradec Kralove. In order to make option for cyclists and pedistrians to cross between shores. There were made three design variants. For detailed solution curved twin-arm arched structure was chosen. The aim of the thesis was design and assessment of Bering strucutre of the footbridge according ultimate limit states and serviceability limit state given by valid Eurocodes.
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Bank Air Conditioning
Grbál, Jakub ; Rubinová, Olga (referee) ; Uher, Pavel (advisor)
This bachelor's thesis deals with the designing of air-conditioning in the bank building. In the theoretic part of the work I present the principle of ventilation and air conditioning. My work describes the advantages and disadvantages of the single systems. The result of the calculation part is the design of the optimum air-conditioning system for the drawing of thermal load in the summer period.
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