Condensing Process:
The high temperature and pressure vapour refrigerant from the compressor is flow out through the condenser where this is totally condensed at constant pressure p2 & temperature T2 as indicated by the horizontal line 2-3 on T-s & p-h diagrams. The vapour refrigerant is changed up into liquid refrigerant. The refrigerant, while flowing through the condenser, gives its latent heat to the nearby condensing medium.
Expansion Process:
The liquid refrigerant at temperature T3 = T2, & pressure p3 = p2 & is expanded by throttling procedure by the expansion valve to a low pressure p4 = p1 & Temperature T4 = T1 as indicated through the curve 3-4 on T-s diagram and through the vertical line 3-4 on p-h diagram. Some liquid refrigerant evaporates as it flows by the expansion valve, but the larger portion is vaporized in the evaporator. We know that throughout the throttling procedure, no heat is absorbed or discarded by the liquid refrigerant.