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Parametric Study of Air Heat Exchanger
Podola, David ; Volavý, Jaroslav (referee) ; Fišer, Jan (advisor)
This diploma thesis deals with the impact of changes in operating and geometrical parameters of regenerative heat exchanger on the efficiency of decentralized ventilation units with heat recovery. Decentralized ventilation unit can be used for ventilation of family houses or smaller administration buildings. Output of this work is to determine the efficiency of a particular produced model of decentralized ventilation unit and overview of the possibilities increased efficiency of heat recovery of this units.
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Ventilation of low-energy houses
Kubisz, Pavel ; Fišer, Jan (referee) ; Charvát, Pavel (advisor)
Dissertation deals with division and description progressive trends of ventilation of low-energy houses. Forasmuch as ventilation is participant in total heat consumption, It is here practical example how total heat consumption depend on ventilation heat consumption and heat consumption by construction. At the close is showed when is good, or bad, to use ventilation with recuperation.
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Energy retrofitting of a family home to the nearly zero energy building
Uhlíř, David ; Fišer, Jan (referee) ; Charvát, Pavel (advisor)
The diploma thesis is devoted to reducing the energy intensity of a two-storey family house from the 1960s, to a building with almost zero energy consumption. First, the family house is analyzed in terms of the condition before reconstruction. The result of this analysis is a certificate of energy performance of the building in its original condition. Within the individual chapters, I subsequently propose specific energy saving measures. At the end of each chapter, these measures are economically evaluated using the New Green Savings Grant Program. The first measure is dedicated to improving the thermal technical properties of the building envelope. This is ensured by the complex insulation of the family house and the replacement of the original windows and doors. The second measure is devoted to the design of a suitable method of forced ventilation with heat recovery. As part of the third measure, I assess and select a suitable heat source that will replace the original heat source of the family house. As a final measure, I propose the use of a renewable energy source in the form of a photovoltaic system, which is based on energy simulation in the program DEKSOFT FVE. At the end of my work, I am developing a building energy performance certificate, which assesses the fulfillment of the condition of a building with almost zero energy consumption.
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Ventilation and cooling system for an apartment in block of flats
Uřičář, Filip ; Fišer, Jan (referee) ; Hejčík, Jiří (advisor)
This Master’s Thesis deals with the design of ventilation and cooling of an under roof flat in a tenement building, built in the 1980s, and consists of five main parts. Within the first main part, the thesis is dedicated to the research of the current state of knowledge in the area ofventilation and cooling of residential premises, secondly, there is a detailed description of a particular flat, thirdly, the calculation for the optimal design of ventilation and cooling are made and, in the fourth part, suggested solutions are proposed with the following evaluation of them including the overall summary. The design of ventilation and cooling was carried out according to the design procedures with respect to the relevant standards and optimized to achieve the desired effect with respect to the requirements of the owner of a housing unit. As a solution, the ventilation of a flat by the Jablotron Futura´s ventilating unit and three variants of a flat cooling were proposed. After the evaluation of all cooling variants, the Sinclair´s multisplit system of cooling was chosen as the most suitable one.
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Photovoltaic power systems for stand-alone applications
Hrňa, Lukáš ; Fišer, Jan (referee) ; Hejčík, Jiří (advisor)
Topic of Bachelor’s thesis is descriptions photovoltaic power systems and their parts. It describes photovoltaic power system for stand-alone applications. In Bachelor’s thesis make photovoltaic power system for cottage. It characterizes basic components for build-up, basic aspect for determination right component and talk about immunity photovoltaic power system in long time.
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The influence of different types of ventilation outlets on the heat transfer by convection from the human body
Zábovský, Ján ; Pokorný, Jan (referee) ; Fišer, Jan (advisor)
The aim of this diploma thesis is to investigate the influence of different types of HVAC system outlets on convective heat transfer from a human body. The first part of the thesis consists of an overview of essentials important for understanding the issue, specifically, metabolism, thermoregulation, heat transfer mechanisms, thermal vote and fluid dynamics. The second part defines the main working hypothesis and describes the used experimental approach leading either to confirmation or disproval of the hypothesis. The chosen approach is based on a measurement with thermal mannequin “Newton” using two different configurations: constant surface temperature and constant generated heat flux. In case of the first configuration, the convection intensity indicator was the value of heat flux generated from each of surface segments of the thermal mannequin. Their surface temperature was the indicator when running the experiment using the second configuration. The value was evaluated by the thermal mannequin as well as the thermal camera Flir i7 which provided more detailed division of the surface. The final part of the thesis describes the progress of the experiment itself, represents gathered values involving analysis of contaminants and confirms or disproves the original thesis.
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Aircraft windshield blowing: solution and design possibilities
Šamša, Petr ; Fišer, Jan (referee) ; Jícha, Miroslav (advisor)
My thesis is considering with aircraft windshield blowing for airplanes designed according to CS-23 regulation. The first part introduces the size of precipitation clearing area in connection with CS-23 regulation and report SAE AIR805C. Next chapter describes a few possible design solutions which can be potentially used for windshield precipitation. There are also other methods analysed in that part. There are not only the casual systems like windshield wipers but some more rare or new technologies too. It can be some fluid repellent surfaces or blowers in that category. The third part deals with jet blast system in detail. There will be a design calculation for airflow conditions which are important for the correct function. The last quarter of this thesis mentions the experiment what should compare the theoretical computations from the third part with the real values.
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Measurement of indoor environment by means of thermal manikin
Ševeček, Jan ; Pokorný, Jan (referee) ; Fišer, Jan (advisor)
This dissertation deals with the measurement of the internal environment through thermal manikin Newton, especially in terms of thermal comfort. Measurements were performed in a typical office environment and cabins of small transport aircraft. The course of events and the time constants for the measurement in the office was given by real flow in the office when the sequences of events were unfolded from the usual transactions carried out during the day. In contrast, the second measurement, which took place in the model of small transport aircraft, the course of events and time constants, was performed exactly according to predetermined plan. The other parts of the thesis describe how to calibrate the manikin and then generate a diagram comfort zones. Following are compared individual test cases and events using the diagram comfort zones. Finally, individual test cases and events are compared using the diagram comfort zones and medics according to ISO 14505-2.
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Production and storage of hydrogen
Čoček, Bedřich ; Fišer, Jan (referee) ; Hejčík, Jiří (advisor)
The objective of this thesis is to give an overview of production technologies and ways of storage of hydrogen. Selected tasks were solved by professional literature and scientific articles. There is a description of ten production technologies in the thesis. This production of hydrogen is from fossil fuel, water and biomass. This thesis also contains five ways of storage of hydrogen for stationary and mobile applications. This storage is in gas and liquid phases, storage in metal hydride and storage with help of sorption.
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Determination of heat transfer coefficients from the surface of the thermal manikin
Fojtlín, Miloš ; Tuhovčák, Ján (referee) ; Fišer, Jan (advisor)
This thesis deals with an experimental determination of heat transfer coefficients from the surface of the thermal manikin. The main focus of the work lies on separating radiative and convective heat fluxes from the surface of the thermal manikin. Both nude and clothed, standing and seated postures were investigated respectively. The tests were conducted in a constant air temperature (cca 24°C) and a constant wind speed (cca 0,05 m.s-1) environment. The major part of the radiative heat flux was eliminated by a low emissivity coating applied to the surface of the nude thermal manikin, and in the case of clothed manikin by a low emissivity two-piece dress. Favorable results were achieved only in the case of the nude manikin measurements. The measurements were performed across 34 zones that logically represent parts of a human body. Experimental work confirms theoretical expectations in the means of a heat transfer. In addition, the results of this work were compared to results of a similar experimental work. The outcomes of this thesis provide essential information in order to create detailed computational models of a thermal environment. Such models require anatomically specific, separate values of convective and radiative heat transfer coefficients.
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