The thermal load of cryogenic pump is mainly the condensation heat of gas and the radiant heat of the surrounding wall facing the cold plate. The condensation heat is related to the type of gas. The condensation heat of nitrogen condensation on 20K cold plate for 80K and 133.322 PA / L is 0.3 to 0.6 J. The radiative heat received by the cold plate is directly proportional to the difference between the 4 power of the panel temperature and the cold plate temperature. Therefore, 4.2K and 20K were cold plate with cold shield board is 50 ~ 100K, in order to reduce the work of the radiation heat cold plate.
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