Question 177Refrigeration & AC - Assistant Engineer

The correct answer is C) expansion valve. In a vapor compression refrigeration cycle, the refrigerant temperature decreases the most when passing through the expansion valve. As the refrigerant flows through the expansion valve, it undergoes a sudden drop in pressure, resulting in a rapid decrease in its temperature. This temperature decrease is due to the Joule-Thomson effect, where the expansion of the refrigerant causes it to cool. The other options are incorrect because the evaporator, compressor, and condenser receiver do not cause the same dramatic decrease in refrigerant temperature as the expansion valve.