After leaving the compressor, the refrigerant enters into a condensation unit also known as Condenser. During the condensation stage, the refrigerant flows through a series of S-shaped heat exchange pipes. As the hot vapor flows through the condensation unit, cool air is blown across the S-shaped tubes by a fan. This process exchanges the refrigerant heat with the outer air. As of result, the hot vapor refrigerant reaches its saturated temperature and changes its state to a high-pressure liquid. In this state, refrigerant leaves the condenser and move on to the metering, expansion, and evaporation stage.
Metering, Expansion, and Evaporation:
The liquid refrigerant with high pressure enters into the metering and expansion valve. The metering device works to main the high pressure of refrigerant on the inlet side, while also expanding the liquid refrigerant and lowering the pressure on the outlet side. At the outlet, an expansion process occurs that causes a decrement in the temperature of the liquid refrigerant.
The outlet side of the metering device generates a low-pressure liquid refrigerant and this refrigerant now enters into the evaporation stage. In this stage, the cool liquid refrigerant enters into coiled tubes of the evaporator. Fans are then used to blow warm air from the conditioned space across the evaporator coils. The cooler refrigerant in the evaporator coils begins absorbing the heat of conditioned space or internal space of refrigerator.
Again this liquid refrigerant absorbs the heat and changes its state from liquid to gas. That’s how this process repeated again and again to maintain the cooling of internal space.