This thesis deals with computing and experimental problems of direct water cooling of stator winding that is assigned in synchronous motors. A model with similar material characteristic to a real motor has been made for experiments. The computing results showed us the appropriate place for the cooling system. This place has been chosen due to maximum efficiency and cost of the cooling system. The experiments on the model showed us, if the computing results are credible.

Effektuttaget ur en elmotor grundar sig i hur mycket ström som kan överföras i elmotorns lindning, vilken i sin tur oftast begränsas av hur varm den blir genom resistiv uppvärmning. Målet med arbetet var att ta reda på vilket värme som uppstår i ledaren, vilken kyleffekt ett vätskeflöde genom ledaren har samt vilket vätsketryck som krävs för att temperaturen på kylvätskan inte ska överstiga 95℃. Genom att ställa upp en analytisk modell kring en ledare och ett vätskeflöde genom denna, vilket i sin tur betyder att hitta kopplingar mellan strömningsmekanikens teori och värmeöverföringsteorin sa erhölls ett resultat. Sedan gjordes både simuleringar och experiment med samma förutsättningar för att kunna validera den analytiska modellen. Den analytiska modellen visade sig stämma väl överens med verkligheten och det skulle visa sig att för en elmotor med 48 ledare med en strömflödestäthet på 50 𝐴/𝑚𝑚2, med en inkommande kylvätsketemperatur på 60℃ och där kylvätskan inte får överstiga 95℃ sa kommer det krävas en pump som kan ge ett flöde av 15 𝑙/𝑚𝑖𝑛 vid ett tryckfall på 1 𝑏𝑎𝑟.

L'électronique de puissance est en pleine mutation matérielle, technologique et conceptuelle. Cette évolution bouscule l'approche traditionnelle de la conception et de la fabrication des convertisseurs statiques avec pour objectif de proposer des solutions plus performantes, plus fiables et plus compactes et tout cela dans un contexte technico économique de plus en plus exigeant. Cette thèse analyse et expérimente un concept innovant de terminaisons en tension verticales ouvrant la voie vers l'intégration en 3D des composants de puissance mais également l'intégration, au sein même de la zone active d'un échangeur thermique. En s'appuyant sur la technique de réalisation des tranchées profondes issue de la micro électronique, ce document présente une approche permettant la co-intégration de plusieurs composants de puissance indépendants partageant la même électrode et le même substrat en face arrière. L'autre volet de ce travail de thèse est focalisé sur le concept DRIM Cooler (Drift Region Integrated Microchannel Cooler), un réseau de microcanaux perpendiculaires au plan de jonction du composant de puissance permettant son refroidissement direct. Les analyses numériques sont complétées par de nombreuses réalisations, caractérisations et mises en œuvre des approches précitées. / The power electronics field is struggling for new material, technological and conceptual evolutions. These changes induce breakthrough in the conventional design and fabrication of static power converters with the aim to offer more efficient, reliable and compact solutions in an increasingly demanding techno economical context. This PhD thesis presents the results obtained by analyzing, realizing and characterizing an innovative concept based on vertical voltage terminations that opens the way towards the 3D integration of power devices. Moreover, the proposed concept authorizes the integration of a microchannel cooler directly into the drift region of the power device. Based on the realization of deep trench terminations, a technique initially developed for the microelectronics field, this PhD thesis presents an approach allowing the integration of multiple power devices in the same die, all sharing the same backside electrode. This document also focuses on the DRIM Cooler (Drift Region Integrated Microchannel Cooler) concept that allows the direct cooling of the device through multiple parallel microchannels integrated perpendicular to the plane of the device's PN junction. The analytical analysis is completed with numerous realizations, characterizations and practical implementations of the above mentioned concepts.

The subject of diploma thesis is design of a testing cabin for high pressure pump testing under low temperature. The objective is to project a cooling system and a cooled testing cabin. Suggested cooling system must be sized to cool down the estimated power and the cabin is supposed to be located inside the existing testbench. There was peroformed an analytical calculation of thermic evaluation, several parts of calculation were verified using ANSYS program simulation. The second section of the thesis is focused mainly on the design, especially on design of testing cabin. The result of diploma thesis is prepared for utilization in Bosch Diesel s.r.o. Jihlava.

The subject of the diploma thesis is the design and the assessment of two variants of existing HVAC system, that serves the microelectronic laboratory premises of GL Electronic company, which are situated in JIC INMEC center. The aim of the designing process is to find the optimal solution of the problem, which is concerned of excessive air humidity gains in the clean rooms. The first proposed approach is the installation of controlled dehumidification in the form of direct cooling into the yet existing device. The second considered approach is a complete deconstruction of implemented air conditioning unit and subsequent reinstalling of the brand new unit, which would meet all the requirements. Both two variants will be in the beginning outlined in a form of pre-study, selected option will be later on processed as project documentation for construction. The winning solution will be designed in the way that will satisfie the criteria of hygiene, function, and economy. The next section of the text will be dedicated to the research regarding the topic of the physical nature of air humidity, of the transportation of humidity, dehumidification of the space, also. Last but not least, the heat recovery efficiency will be measured (in the form of thermal glycol tubes). The experiment provides evidence of the system's real-time performance.

Estimation of cooling station safety Diploma thesis, institute of metrology and quality assurance and testing, Brno University of Technology. The diploma thesis deals with safety evaluation of cooling plant at a pool stadium, which uses amonia as a coolant. The work includes particular calculation (quantitative risk estimation) of cooling the plant with amonia. For cooling at the pool stadium no salt water, only amonia is used, so it is direct cooling. The safety of population, animals and enviroment is considered. Part of this thesis is also the estimation of the chemical exposure index (CEI) and simulation of breakdown effects with ALOHA model (Areal Locations of Hazardous Atmospheres). At the end FMEA method is used, the method cause – effect.

Diploma thesis deals with direct cooling systems in food processing plants. The work focuses on the description of the components of the refrigerant cycle, with emphasis on the choice of refrigerant. The result is a design of direct cooling system in the food factory in the variants with refrigerant R404A and R717. The work describes the advantages and disadvantages of various options. The work includes an experimental section which deals with the measure-ment and processing of the actual values of the refrigerant cycle and the comparison of two cold sources.

This thesis describes the design of cooling ice rink. Cooling system design is based on a physical nature, measured data and observations from practice. The result is a proposal cooling system with the highest possible cooling factor, which uses waste heat for technology needs snow pit and hot water, in order to achieve the lowest cost of operation ice rink.

The diploma thesis deals with the design of the heating and cooling system, inclu-ding hot water preparation for the administrative part of the production hall. The first part of the thesis briefly discusses the history of heating and cooling of office buildings, legislative requirements and current solutions. The second part contains the design of the entire heating and cooling system with heat pump as a source of heat and cold. The final part of the thesis describes the experimental measure-ment and evaluation of the efficiency of the ice rink source.