Evaporator:

Evaporator

As the refrigerant passes through the evaporator, it absorbs heat, increasing its heat content. We see it on the P-H chart on line drawn to the right of point 1. The refrigerant leaves the evaporator in the point 2. Its enthalpy change from 42 BTU/lb to 110 BTU/lb, a total of 68 Btu/lb. In other words, about 68 Btu will be absorbed by the evaporator in the refrigerant for each pound of refrigerant circulates through the system. This is what allows the system to perform its cooling job. The amount of heat absorbed by the evaporator per pound refrigerant circulates called the effect of cooling system.

As the refrigerant leaves the evaporator, he started overheating. It is low temperature, low pressure, superheated gas at the actual temperature of about 50F.

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Evaporator