The design of a refrigeration system, highlighting key components such as the condenser, evaporator, expansion valve, and compressor. The system operates in four stages, with refrigerant moving through the condenser (state 1), where it is condensed and pressurized, followed by the expansion valve (state 2) where the refrigerant expands and drops in temperature. In the evaporator (state 3), the refrigerant absorbs heat, cooling the space, and then returns to the compressor (state 4) to begin the