Topic: Refrigeration and Air Conditioning
The formation of frost on cooling coils in a refrigerator-
- A. Increases power consumption
- B. Improves C.O.P. of the system
- C. Increases heat transfer
- D. Reduces power consumption
Answer: A. Increases power consumption
Explanation: The addition of frost reduces the amount of cooling available over time because frost acts as an insulator (decreasing heat transfer), so that the machinery runs longer with the frost on it than without frost. This additional run time increases the overall power consumption.