Which component is primarily responsible for absorbing heat by boiling in the refrigeration cycle?

• A. Condenser
• B. Evaporator
• C. Compressor
• D. Metering device

Answer: (B)

Heat absorption by boiling happens where the refrigerant changes from liquid to vapor at low pressure, which is the evaporator. In this component, heat from the cooled space is transferred to the refrigerant, causing it to boil and vaporize, and it does so by taking in latent heat. This cooling effect—the space losing heat as the refrigerant absorbs it—drives the cycle. The condenser, by contrast, rejects heat to the surroundings; the compressor provides the energy by compressing the vapor, and the metering device lowers the pressure to enable evaporation but doesn’t itself boil the refrigerant.