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SMV-2023-51: Cryogenic attributies of selected products
Srnka, Aleš ; Hanzelka, Pavel ; Krutil, Vojtěch
Thermal flows between hotter and colder parts of special components of cryogenic machines during different border temperatures were measured. Experimental results were compared with theoretical calculations. Onward was tested vacuum leak of different types of cryogenic seals up to pressure 30 bar. Research reports were passed on to contractor. Measurements were conducted in apparatuses, newly designed and developed in the ÚPT AV ČR, v. v. i.
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Electrical properties of thick film pastes measured in a wide temperature range
Gajdoš, Jiří ; Jankovský, Jaroslav (referee) ; Řezníček, Michal (advisor)
The aim of this master’s thesis is to investigate the electrical properties of various thick-film resistor pastes in a wider temperature range. The thesis mainly focuses on a change in electrical resistance depending on temperatures, which extend to the cryogenic region. To achieve this, there is an overview of the thick-film technology properties, major technological procedures, principles of resistive pastes conductivity, methods of electrical resistance measuring, possible errors in measurement and methods of their minimization. The content of this work is also familiar with the characteristics of a cryogenic station, on this foundation was proposed the measurement procedure and created thick-film circuits for this station. After measurement in the interval 10 K to 350 K, there are subsequently evaluated the data and explains the principles of the conductivity of used pastes.
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SMV-2022-56: Measurement of thermal flows in shaft of expansion turbine type HEXT 300
Srnka, Aleš ; Hanzelka, Pavel ; Krutil, Vojtěch
Thermal flows between hotter and colder parts of cryogenic machine shaft during different border temperatures were measured in the apparatus, newly designed and developed in the ÚPT AVČR Brno, v. v. i. Experimental results were compared with theoretical calculations. After finished experiments, the research report was passed on to contractor. The research is conducted according Contract between PBS a.s. Velká Bíteš and ÚPT AV ČR Brno, v. v. i., signed on the 17. 9. 2018 and according order No. 21431667 from 9. 8. 2021.
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SMV-2019-28: Research of thermal conductivity of samples from different materials in temperature range 10 – 80 K
Srnka, Aleš
The aim of the project was R&D of measurement apparatus for assess of thermal conductivity of materials, especially metalic, which are used in cryogenic rotary machines. After R&D steps and basic tests of apparatus, there was in the apparatus tested thermal conductivity of sample, that was delivered by contractor. After finished experiments, the measurement protocol was passed on to contractor. The research is conducted according Contract between PBS a.s. Velká Bíteš and ÚPT AV ČR Brno, v.v.i., signed on the 17.9.2018 and according order No. 84302181 from 9.10.2018.\n
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Electrical properties of thick film pastes measured in a wide temperature range
Gajdoš, Jiří ; Jankovský, Jaroslav (referee) ; Řezníček, Michal (advisor)
The aim of this master’s thesis is to investigate the electrical properties of various thick-film resistor pastes in a wider temperature range. The thesis mainly focuses on a change in electrical resistance depending on temperatures, which extend to the cryogenic region. To achieve this, there is an overview of the thick-film technology properties, major technological procedures, principles of resistive pastes conductivity, methods of electrical resistance measuring, possible errors in measurement and methods of their minimization. The content of this work is also familiar with the characteristics of a cryogenic station, on this foundation was proposed the measurement procedure and created thick-film circuits for this station. After measurement in the interval 10 K to 350 K, there are subsequently evaluated the data and explains the principles of the conductivity of used pastes.
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