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Flexible structure development for efficient heat transfer
Černoch, Jakub ; Lazar, Václav (oponent) ; Mašek, Jakub (vedoucí práce)
The master’s thesis deals with theoretical calculations and design of a structure for heat transfer, which is part of a Miniaturized Heat Switch according to the specified requirements of the European Space Agency. The basic parameters are low weight and high thermal conductivity. The work follows the switch designed by Arescosmo, which did not meet the requirements, especially in the area of weight and thermal conductivity. Using theoretical calculations of weight and thermal conductivity, 49 variants were verified in 3 basic concepts – Mechanical contact structure, flexible structure composed of wires and foil structure. In terms of thermal conductivity, the best structures are those based on the use of metal stocking and sleeving braids. Manufacturing technologies have also been proposed from available sources that could be used to produce these structures. To meet the requirements, in the next phase of the project it will be necessary to produce experimental samples on which the theoretical calculations and selected technologies will be verified.
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Experimental study on satellite´s passive thermal-regulation units
Mateášik, Timko Marek ; Mašek, Jakub (oponent) ; Lazar, Václav (vedoucí práce)
Master‘s thesis examines the eect of thermal interface materials on thermal contact conductance and resistance. The thesis focuses on application of the thermal interface materials for the thermal contact conductance enhancement in the miniaturised heat switch and the spacecraft generally. Theoretical part of this work briey reviews variety of passive thermal control systems used in spacecraft, including thermal interface materials and explains the background of this work. This work further a reviews of the variety of thermal interface materials, especially coatings and foils, and introduce the selection of suitable thermal interface materials. Experimental part of this work examines surface parameters, thermal conductivity and microhardness of copper specimens which serve as substrate for pure silver coating. Further examines the measurement conditions, evaluation methods and experimental measurements. The experimental measurements are carried out in thermo-vacuum test chamber and conclusion are made based on the results. The recommendations for further work are made.
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Thermal contact resistance of planar surfaces
Mateášik, Timko Marek ; Horák, Marek (oponent) ; Mašek, Jakub (vedoucí práce)
Bachelor‘s thesis examines the thermal contact resistance of planar surfaces for purposes of miniaturised heat switch project. The thesis focuses on nding of suitable mathematical model for prediction of thermal contact resistance as one of the possible solutions for miniaturized heat switch optimization. This work consists of theoretical and practical part. Theoretical part briey introduce a background of the project and the reason for initiation of this work. This work, further examines the denition of thermal contact resistance and factors that inuence it. Subsequently introduce a review of existing models for prediction of thermal contact resistance, appropriate selection of models for the possible use and their description. Practical part examines the copper specimens layout and manufacture for experimental measurements, their further modications and surface measurements. Further examines the measurement methods, measurement conditions and the experiments of thermal contact resistance. Theoretical measurements are carried out with the use of models from theoretical part and experimental measurements are carried out with the use of test chamber. Measurements are compared. Based on the results from measurements the conclusions are made, that will be used in the future for space component development.
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Qualification test of heat switch for Martian conditions
Mašek, Jakub ; Horák, Marek (oponent) ; Popela, Robert (vedoucí práce)
Master thesis examines the description of the heat switch project in general and findings that have been attained so far. The thesis focuses on the development of test facility to perform the proposed heat switch test campaign in simulated Martian conditions. The first section foremost aim is to describe the evolution of the Heat switch test chamber intended for extreme condition simulations, i.e. low pressure and temperatures, from a preliminary design to the final test configuration. Thesis deals with reasons of the chamber configuration modifications and serves proposal solutions of unpredictable incidents to be further confirmed or disapproved. The aim of the second part of the thesis is to design the test campaign of the Miniaturized heat switch from initial test chamber validation experiments, via calibration tests to approve the drafted facility configuration performance, to the Bread Board verification tests and EQM final Qualification test. In addition the thesis focuses on measured data evaluation procedure and related effects. The calibration tests of the chamber configuration and data evaluation verification tests all performed with the Dummy specimens are almost finished. Once the results will be approved, the test chamber and test procedure schemes will be ready for BB and EQM testing.
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Calibration task of experimental device for space technology testing
Lazar, Václav ; Horák, Marek (oponent) ; Mašek, Jakub (vedoucí práce)
The Master thesis deals with an experimental test facility calibration procedure. The thesis focuses on a complex mathematical thermal model proposal, which describes the inner facility thermal processes during the specimen conductance measurements. The first section introduces the test facility, its limits, and the measurement principle. The necessary third version facility upgrades made to secure the prescribed test conditions are covered. The calibration need and reasons also resonate through the first section. The second part aims at the calibration specimens and the Thermal Model designs proposals. The specimens requirements and their final properties are brought forward. The determined heat losses calculations are completed with the defined refining procedure suggestion. The calibration specimens measurements were performed with a new test facility version three. The measured results will serve as calibration inputs for the Thermal Model tuning, necessary for the calibration task completion. The functional model will enable to proceed with the next phase of the test facility experiments.
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Experimental study on satellite´s passive thermal-regulation units
Mateášik, Timko Marek ; Mašek, Jakub (oponent) ; Lazar, Václav (vedoucí práce)
Master‘s thesis examines the eect of thermal interface materials on thermal contact conductance and resistance. The thesis focuses on application of the thermal interface materials for the thermal contact conductance enhancement in the miniaturised heat switch and the spacecraft generally. Theoretical part of this work briey reviews variety of passive thermal control systems used in spacecraft, including thermal interface materials and explains the background of this work. This work further a reviews of the variety of thermal interface materials, especially coatings and foils, and introduce the selection of suitable thermal interface materials. Experimental part of this work examines surface parameters, thermal conductivity and microhardness of copper specimens which serve as substrate for pure silver coating. Further examines the measurement conditions, evaluation methods and experimental measurements. The experimental measurements are carried out in thermo-vacuum test chamber and conclusion are made based on the results. The recommendations for further work are made.
|
|
|
Flexible structure development for efficient heat transfer
Černoch, Jakub ; Lazar, Václav (oponent) ; Mašek, Jakub (vedoucí práce)
The master’s thesis deals with theoretical calculations and design of a structure for heat transfer, which is part of a Miniaturized Heat Switch according to the specified requirements of the European Space Agency. The basic parameters are low weight and high thermal conductivity. The work follows the switch designed by Arescosmo, which did not meet the requirements, especially in the area of weight and thermal conductivity. Using theoretical calculations of weight and thermal conductivity, 49 variants were verified in 3 basic concepts – Mechanical contact structure, flexible structure composed of wires and foil structure. In terms of thermal conductivity, the best structures are those based on the use of metal stocking and sleeving braids. Manufacturing technologies have also been proposed from available sources that could be used to produce these structures. To meet the requirements, in the next phase of the project it will be necessary to produce experimental samples on which the theoretical calculations and selected technologies will be verified.
|
|
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Calibration task of experimental device for space technology testing
Lazar, Václav ; Horák, Marek (oponent) ; Mašek, Jakub (vedoucí práce)
The Master thesis deals with an experimental test facility calibration procedure. The thesis focuses on a complex mathematical thermal model proposal, which describes the inner facility thermal processes during the specimen conductance measurements. The first section introduces the test facility, its limits, and the measurement principle. The necessary third version facility upgrades made to secure the prescribed test conditions are covered. The calibration need and reasons also resonate through the first section. The second part aims at the calibration specimens and the Thermal Model designs proposals. The specimens requirements and their final properties are brought forward. The determined heat losses calculations are completed with the defined refining procedure suggestion. The calibration specimens measurements were performed with a new test facility version three. The measured results will serve as calibration inputs for the Thermal Model tuning, necessary for the calibration task completion. The functional model will enable to proceed with the next phase of the test facility experiments.
|
|
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Thermal contact resistance of planar surfaces
Mateášik, Timko Marek ; Horák, Marek (oponent) ; Mašek, Jakub (vedoucí práce)
Bachelor‘s thesis examines the thermal contact resistance of planar surfaces for purposes of miniaturised heat switch project. The thesis focuses on nding of suitable mathematical model for prediction of thermal contact resistance as one of the possible solutions for miniaturized heat switch optimization. This work consists of theoretical and practical part. Theoretical part briey introduce a background of the project and the reason for initiation of this work. This work, further examines the denition of thermal contact resistance and factors that inuence it. Subsequently introduce a review of existing models for prediction of thermal contact resistance, appropriate selection of models for the possible use and their description. Practical part examines the copper specimens layout and manufacture for experimental measurements, their further modications and surface measurements. Further examines the measurement methods, measurement conditions and the experiments of thermal contact resistance. Theoretical measurements are carried out with the use of models from theoretical part and experimental measurements are carried out with the use of test chamber. Measurements are compared. Based on the results from measurements the conclusions are made, that will be used in the future for space component development.
|
|
|
Qualification test of heat switch for Martian conditions
Mašek, Jakub ; Horák, Marek (oponent) ; Popela, Robert (vedoucí práce)
Master thesis examines the description of the heat switch project in general and findings that have been attained so far. The thesis focuses on the development of test facility to perform the proposed heat switch test campaign in simulated Martian conditions. The first section foremost aim is to describe the evolution of the Heat switch test chamber intended for extreme condition simulations, i.e. low pressure and temperatures, from a preliminary design to the final test configuration. Thesis deals with reasons of the chamber configuration modifications and serves proposal solutions of unpredictable incidents to be further confirmed or disapproved. The aim of the second part of the thesis is to design the test campaign of the Miniaturized heat switch from initial test chamber validation experiments, via calibration tests to approve the drafted facility configuration performance, to the Bread Board verification tests and EQM final Qualification test. In addition the thesis focuses on measured data evaluation procedure and related effects. The calibration tests of the chamber configuration and data evaluation verification tests all performed with the Dummy specimens are almost finished. Once the results will be approved, the test chamber and test procedure schemes will be ready for BB and EQM testing.
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