Analyzed are principles of throttlingexpansion process and isentropy expansion process and derivation formula is adopted to identify the essential distinction of the both theoretically.
分析节流膨胀与等熵膨胀的原理，通过推导公式，从理论上找到二者的本质区别。
2
The high-pressure liquid refrigerant through the expansion valve, because the expansion valve throttling pressure drop, the refrigerant into normal temperature low pressure liquid.
常温高压的液体冷媒流过膨胀阀，因为膨胀阀的节流作用压力降低，使得冷媒变成常温低压的液体。
3
Liquid medium the dry filter to remove water, impurities, into the expansion valves throttling decompression, become a low voltage liquid medium, low temperature within in the evaporator gasification.