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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Přenos tepla napříč superizolacemi z pokojových do nízkých teplot
 Hirschl, Ch. ; Králík, Tomáš ; Laa, Ch. ; Musilová, Věra ; Schmid, T. ; Stipsitz, J.
For more than 30 years thermal measurement results and analytical formulas are available to calculate the heat transfer through Super Insulation (SI). According to the temperature dependence of the emissivity for aluminium, the most commonly used material for the reflecting surfaces, derivations based on the Stefan-Boltzmann-Law for radiative heat transfer have been established. Together with conductive terms this leads to formulas for the calculation of heat transfer through SI. Using new measurement results of temperature-dependent emissivity and conductivity we have performed heat flux calculations applying common software tools. The heat transfer through the SI and the temperature distribution inside the SI calculated with this new approach has been compared with the established formulas and measurement results.
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Návrh héliového kryostatu pro studium turbulentní tepelné konvekce při kryogenních teplotách
 Srnka, Aleš ; Hanzelka, Pavel ; Musilová, Věra ; Urban, Pavel ; Skrbek, Ladislav
We present the design of a cryostat with an experimental cell for turbulent thermal convection using cryogenic helium gas. It is based on our long-term experience in cryostat design, especially low-loss cryostats for NMR magnets. The top and bottom of the convection cell are made of thick Cu plates. The cylindrical stainless steel wall consists of three parts; the middle one is exchangeable and allows for varying the cell aspect ratio. Another goal of our cell design is reduction of the parasitic heat flux from the copper plates via the cylindrical wall to its interior. As the cell operates up to 3.5 bar, we have paid significant attention to the safety of the cryostat and simulated critical situations such as a sudden vacuum loss.
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