Standard Vapour Compression Cycle:

The standard vapour compression refrigeration cycle have following:

 (1) Low pressure saturated vapour would enter the compressor.

 (2) Compression would be isentropic.

 (3) Constant pressure heat refusal would take place at the condenser with the exit state of the refrigerant being saturated liquid.

 (4) The throttling procedure would be adiabatic.

 (5) Constant pressure heat transfer would occur in the evaporator.

All of these ideal conditions can be illustrated by the following T-s diagram

T-S Diagram of Ideal Vapour Compression Refrigeration Cycle