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Trades Qualification (TQ) Practice 3rd Year Practice Test

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During the refrigerant cycle in a split system, which phase change occurs as the refrigerant absorbs heat?
Correct Answer:
Evaporation
Explanation:
In the evaporator, heat is absorbed from the surroundings, and the liquid refrigerant changes to a gas. This phase change from liquid to vapor is evaporation, driven by the heat input at low pressure. The evaporator’s job is precisely to remove heat by allowing this latent heat of vaporization to be absorbed, producing the cooling effect. Condensation would occur when gas loses heat and becomes liquid in the condenser, compression increases pressure without a phase change, and expansion throttles the refrigerant lowering pressure and temperature but doesn’t involve heat absorption to change phase. So the phase change during heat absorption is evaporation.

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