In a cascade refrigerating system, one evaporator coil cools the next component. What is that component?

• A. Compressor
• B. Evaporator
• C. Condenser
• D. Receiver

Answer: (C)

In cascade refrigeration, two separate refrigerant loops exchange heat through a cascade heat exchanger. The cold evaporator coil from the low-temperature loop absorbs heat and transfers some of it to the high-temperature loop, effectively cooling that loop’s condenser. Because of this heat-exchanger arrangement, the component being cooled by the evaporator is the condenser of the other loop. The compressor isn’t directly cooled by an evaporator in this setup, the evaporator isn’t cooling another evaporator, and the receiver is simply a storage vessel, not a heat exchanger.