Oversized expansion valve
1. In high load ,no problem.
2.during low load ,flow will more.
3. Low degree of superheat tev close so short cycling.
4. Ice formation on evaporator and suction side
5.liquid hammer on compressor
High specific enthalpy of vaporization
It is the property of refrigerant .this property makes it attractive because 1.reduce the quantity of refrigerant in circulation 2. We can use lower speed machine and small plant 3.increase cofficent of performance
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