1）Gas isenthalpy expansion refrigeration
Under certain pressure and temperature, when the gas is expanded adiabatically through the throttle valve or the expander, its temperature will be reduced and it will even be liquefied. This refrigeration method is often used in gas separation and gas liquefaction and gas refrigerator. The enthalpy of an actual gas is a function of temperature and pressure. The enthalpy of a gas before and after throttling generally changes. This phenomenon is known as the joule-thomson effect. This is how the JT refrigerator works.
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