The thesis deals with the evaluation of the change of mechanical properties of weldments after heat treatment and the influence of heat treatment on the mechanical properties of the material. The work is focused on characterization of methods in welding technology. First part of the work describes an individual types of welding. Welding is divided into melt and pressure, which is further subdivided into other types of welding. Some of the selected types of welding are described more specifically. The experimental measurement is described in the practical part of the thesis. The mechanical properties of heat-affected and influenced samples are compared. Experimental measurements consisted of a hardness test and a tensile test. Measurements are complemented by graphs from the tensile test.

This work deals with the hygienic quality of milk, the possibilities of its influence in the barn in the process of breeding and in its acquisition. The theoretical part describes in detail the various components of milk, such as proteins, fats, carbohydrates and focuses on hy-giene of the milk before and after milking. There is also described heat treatment of milk, including cattle diseases that affect milk production. In the practical part evaluates the qual-ity of the milk sold in selected farm. Starting from the results of laboratory analyzes of milk, which are assessed according to the season and the state of health of dairy cows.

This diploma thesis provides basic information about the thermal pumps and photovoltaic systems. The heat pumps are described regarding their construction and sources of low potential heat. The description of photovoltaic systems explains the main principle of transformation the solar light to electric power and possible cooperation of this systems with the heat pumps. In practical part of the thesis there is a description of the assessed building and calculation of its thermal losses. It is followed by three designs of the thermal pump systems which are supposed to replace the original way of heating - the electric boiler. One of the designs is supported by photovoltaic system. The final part of the thesis provides the calculation of required heat sources for house and water heating, the operation expanses of all three heat pump designs, prices of electric energy and economical reliability of described solutions.

The diploma thesis is focused on the design of heating and forced ventilation for the project of the family house Doubrava. In the first two chapters is briefly described the theory and there is also described the project of the family house. The next chapter deals with the design of the forced equal pressure ventilation with the heat and moisture recovery. Than the heat loss are calculated according to the norm ČSN EN 12831-1. The next part is focused on the design of heating system and the heat source for the family house Doubrava. There is described detailed design of the floor heating, including necessary calculations, and also the type of the heat pump, as the heat source and source for hot water heating, is chosen. This part also contains a selection of expansion tank and safety valve and approximate calculation of the size of the primar circuit. The last part deals with the possibilities of using renewable energy sources. At the end of the thesis, there are more detailed results of the calculations and the mechanical drawings of individual designs of the ventilation and heating system and also there are tables of the acquisition costs.

The diploma thesis deals with the issue of replacement of non-ecological refrigerant R22 according to the requirements of relevant juristic regulations and of subsequent influence of this replacement to the efficiency of air conditioning systems. The theoretical part is focused on proceeding processes in thermodynamic cycles and during heat transfer, then determines calculation of cooling and heating factor in context with experimental measurement. The experimental measurement utilizes to the assessment of operation of heat pump after refrigerant replacement and it is source for the composion of economical evaluation of alternative solutions due to the particular choice of refrigerant replacement.

This diploma thesis deals with the assessment of SCOP of the heat pump installed in the selected building and with the determination of optimal size of accumulation which should help to heat pump work with higher temperature and higher SCOP. Annual savings of operating cost and return of investment from installation of accumulation tank are evaluated in this thesis. In the research part of this thesis are described the main components of heat pump, sources of low-potential heat and types of heat pump.

On many structures there ocurred a problem of expanded polystyrene-based thermal insulation material degradation caused by high temperatures close to glazed areas. In a theoretical part of this Master’s Thesis there are the most common thermal insulation materials described, followed by a brief desciption of flat roof waterproofing materials and a thermal stress of structures. An experimental part describes a design of a methodology for evaluation of thermal resistance properties of foamed insulants in flat roofs and several experiments carried out according to the methodology.

The objective of the presented diploma thesis is to evaluate the influence of modification on surface layer of products with their base structure from organical fibers and on the ability to resist increased humidity. Emphasis is puted on the description of humidity propagation in fiber materials ant he approximation of secondary waste from the textile industry as a potencional material for thermal insulation. The end of the theoretical part focuses on the types of possible surface treatment to prevent the ingress water into the structure of the material. The practical part verifies the selected type of modification of the surface layer of three materials choosen as test ensemble. After applying surface treatment, the effect of treatment on humidity sensitivity and water absorption was assessed. The determination of the thermal conductivity coefficient, the short-term absorption at partial immersion and the determination of the sorption humidity were made.

This diploma thesis deals with the issue of heat pumps as devices using low-potential heat of the surrounding environment for heating of buildings. In the theoretical part of the thesis there are described various types of these devices, the sources of low-potential heat and the possibilities of heat energy accumulation. The practical part of the thesis is focused on processing and evaluation of operational data of air/water heat pump used for heating of family house and assessment of importance of accumulation tank in heating system. Part of the thesis is also a proposal of optimization of heat pump control.

The diploma thesis is focused on a ventilation and cooling design of a family house. Author’s idea was to make summary of theoretical information and project documentation for realization (installation) of the ventilation and cooling. Introduction of the house disposition, theoretical research of a current cooling and ventilation options in residential buildings are parts of this thesis. Next it contains thermal load calculation, two designs of a cooling and three designs of a forced ventilation, dimensioning of the pipelines and financial cost comparison of a purchase, assembly, working and service of a designed systems.