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The Effect of the Bypass Factor on Design and Geometry of the Evaporator for the Cooling Unit
Vytasil, Michal ; Rubinová, Olga (referee) ; Rubina, Aleš (advisor)
Diploma thesis focuses on effect of the bypass factor on design and geometry of the evaporator for the cooling unit of data centre. Effect of the bypass factor on individual design parameters is solved in detail. All dependendecies are captured by using graphs in which s placed a cement on that parameter. In part C, mathematical and physical solutions are demonstrated calculations and processes leading to the design of the exchanger. In the end, evaluation of the calculations is done and there is also showed possible improvements for the practise.
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Optimizing the design modern low energy timber structures
Bečkovská, Tereza ; Tichomirov, Vladimír (referee) ; Myslín, Jiří (referee) ; Vávra,, Roman (referee) ; Šuhajda, Karel (advisor)
This Doctoral thesis is focused on optimizing the design of modern wooden structures. Because this theme is very comprehensive, the work analyzes the distribution of moisture through the building envelope in detail. In the introduction are summarizes the knowledge of the physical processes in the constructions, there are also the properties of wood as a material and basic information about system of timber structures. The next section describes used methodology and experimental measurements realized on an experimental timber house EXDR1. There is specified the principle of measurement based on the SWOT analysis, the use measuring devices or possible solutions in the field of numerical modeling too. Main results and conclusions of the dissertation for technical practice including possibilities of further research are summarized in the final section.
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Permeability of natural surfaces of Hruba Skala sandstone in rock cities for water vapour and intensity of evaporation
Slavík, Martin ; Bruthans, Jiří (advisor) ; Pavlíková, Milena (referee)
Aim of this study was to describe capillary water and vapor transport in shallow subsurface of Hrubá Skála sandstone in the Bohemian Paradise. I have quantified permeability of Hrubá Skála sandstone for water vapor using "wet cup" method and also capillary water absorption of sandstone drill cores. I have found out general rules of evaporation and rate of evaporation from several sandstone outcrops in real microclimate. Important part of my work was to determine whether surface crust plays some role in studied parameters. Based on my results, permeability of different types of sandstones for water vapor does not vary significantly and surface crust has no effect on rate of water vapor diffusion. Rate of capillary water absorption is reduced by surface crust. Hrubá Skála sandstone is classified as medium or highly absorbing material. I have proved that evaporation from porous medium can be approximated by exponential function. Rate of evaporation is strongly controlled by climatic conditions, especially by relative humidity. Powered by TCPDF (www.tcpdf.org)
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Vliv mikroklimatu ve stáji na mléčnou užitkovost krav holštýnského skotu
Branžovská, Eliška
This bachelor thesis is focused on the analysis of microclimate which affects on dairy yield of dairy cows of Holstein cattle in specific breeding. The aim of my bachelor thesis was to assess the influence of microclimatic parameters (temperature and RH) on the amount of dairy yield of dairy cows in the stable of the specified farm. The monitoring of this issue was performed from 1st January 2018 till 31st December 2018. There is a characteristic of breed of Holstein cattle, an evaluation of the influence of microclimate on dairy yield. There is also detailed description of milk composition, dairy yield and influences which affect it as well as history and standard of Holstein cattle. The practical part is focused on characteristics of the farm which is located in Počenice in Zlin region where I carried out the monitoring. I found that in the summer months, when average daily temperatures in the stable were up to 29 ° C and air humidity up to 75 %, the average daily milk yield of all cows was 14903 kg, but the protein and fat content of milk was low. In the winter months, when the stable temperatures were around 5-10 ° C and the humidity (38-45 %), the average daily milk yield was only 11842 kg, but high in milk and protein content.
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Optimizing the design modern low energy timber structures
Bečkovská, Tereza ; Tichomirov, Vladimír (referee) ; Myslín, Jiří (referee) ; Vávra,, Roman (referee) ; Šuhajda, Karel (advisor)
This Doctoral thesis is focused on optimizing the design of modern wooden structures. Because this theme is very comprehensive, the work analyzes the distribution of moisture through the building envelope in detail. In the introduction are summarizes the knowledge of the physical processes in the constructions, there are also the properties of wood as a material and basic information about system of timber structures. The next section describes used methodology and experimental measurements realized on an experimental timber house EXDR1. There is specified the principle of measurement based on the SWOT analysis, the use measuring devices or possible solutions in the field of numerical modeling too. Main results and conclusions of the dissertation for technical practice including possibilities of further research are summarized in the final section.
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Permeability of natural surfaces of Hruba Skala sandstone in rock cities for water vapour and intensity of evaporation
Slavík, Martin ; Bruthans, Jiří (advisor) ; Pavlíková, Milena (referee)
Aim of this study was to describe capillary water and vapor transport in shallow subsurface of Hrubá Skála sandstone in the Bohemian Paradise. I have quantified permeability of Hrubá Skála sandstone for water vapor using "wet cup" method and also capillary water absorption of sandstone drill cores. I have found out general rules of evaporation and rate of evaporation from several sandstone outcrops in real microclimate. Important part of my work was to determine whether surface crust plays some role in studied parameters. Based on my results, permeability of different types of sandstones for water vapor does not vary significantly and surface crust has no effect on rate of water vapor diffusion. Rate of capillary water absorption is reduced by surface crust. Hrubá Skála sandstone is classified as medium or highly absorbing material. I have proved that evaporation from porous medium can be approximated by exponential function. Rate of evaporation is strongly controlled by climatic conditions, especially by relative humidity. Powered by TCPDF (www.tcpdf.org)
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The Effect of the Bypass Factor on Design and Geometry of the Evaporator for the Cooling Unit
Vytasil, Michal ; Rubinová, Olga (referee) ; Rubina, Aleš (advisor)
Diploma thesis focuses on effect of the bypass factor on design and geometry of the evaporator for the cooling unit of data centre. Effect of the bypass factor on individual design parameters is solved in detail. All dependendecies are captured by using graphs in which s placed a cement on that parameter. In part C, mathematical and physical solutions are demonstrated calculations and processes leading to the design of the exchanger. In the end, evaluation of the calculations is done and there is also showed possible improvements for the practise.
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Evalutation of storage potato varieties Red Anna and Dali
BOŠKOVÁ, Veronika
The aim of the bachelor's thesis was to assess the storage of chosen potato varieties Red Anna and Dali depending on harvest time. Both varieties were grown in the fields near the village Chlumany (South Bohemia, District of Prachatice), then the tubers were stored in local storage facility and there the potato samples were also observed. The experiment was carried out in 2013-2014. The samples were taken as four variants of each variety. The variants differed in their harvest time. Tuber weight loss influenced by essential and pointless losses was monitored in each sample. It was confirmed that potato storage was influenced by suitable harvest time and partially also by the weather during the harvest. The worst result was shown by the first harvest of medium ripening variety Red Anna. The tubers were not ripe enough and completely unsuitable for a long-term storage. Those tubers were very shrunk already in December and therefore not usable for further processing. On the contrary, the last harvest of both potato varieties was the most convenient for storage. The samples taken from the last harvest showed the lowest loss during the storage and those potatoes were very nice while observed and measured for the last time. The bachelor's thesis also mentions important factors that can influence the storage of potatoes (temperature, relative humidity, ventilation, mechanically damaged tubers, potato diseases).
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