Refrigeration cycle

 Refrigeration cycle 

This diagram illustrates the refrigeration cycle for a typical walk-in refrigerator using R22 refrigerant. 

The cycle begins with the compressor, which increases the pressure of the refrigerant to 280 psig, raising its temperature to 175°F. 

The hot, high-pressure gas flows into the condenser, where it loses heat to the ambient air (95°F) and condenses at 125°F. 

After passing through a thermal expansion valve (TEV), the refrigerant expands and cools to 25°F as it enters the evaporator, absorbing heat from the refrigerator space and lowering the box temperature to 35°F. 

The refrigerant then returns to the compressor, completing the cycle.

 This system efficiently maintains the desired cooling temperature in the walk-in refrigerator while using R22 refrigerant.