3）air adiabatic exhaust refrigeration
When a certain amount of vaporized gas in the container passes through the control valve to adiabatically deflate the ambient medium (or to pump air with vacuum), the gas remaining in the container will push work to the gas released, consuming a part of its internal energy (internal energy), thus reducing the temperature. This is one of the principles of a gas refrigerator. Fermian's closed-cycle prototype rack provides cooling capacity using a GM refrigerator, which is cooled by the adiabatic expansion and absorption of high-pressure helium.
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