The evaporator in a refrigeration system:

• A. Meters the refrigerant.
• B. Condenses the refrigerant.
• C. Is the component where refrigerant boils and absorbs heat.
• D. Compresses the vaporized refrigerant.

Answer: (C)

The evaporator’s job is to absorb heat from the space being cooled by the refrigerant. It’s a heat exchanger where the refrigerant, at low pressure and low temperature, boils as it absorbs heat, changing from liquid to vapor. This phase change at low pressure is what pulls heat out of the surroundings, producing the cooling effect.

The other statements describe functions of different components: metering the refrigerant is done by the expansion device, condensation happens in the condenser, and compression is performed by the compressor.