What absorbs heat from the product to be cooled?

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

Answer: (D)

The evaporator is where cooling happens by pulling heat from the product. It’s a heat exchanger at the low-pressure, low-temperature side of the cycle. As the product deposits heat to the refrigerant, the liquid ammonia absorbs that energy and boils into vapor. That phase change (latent heat absorption) is what lowers the product’s temperature, providing the cooling effect. The other components have different roles: the condenser rejects heat to the surroundings, the expansion device drops pressure and temperature, and the compressor supplies work to circulate the refrigerant and raise its pressure for the cycle.