Question

What is the best coefficient of performance possible for a hypothetical refrigerator that could make liquid nitrogen at −200ºC and has heat transfer to the environment at 35.0ºC?

a) 9.00
b) 9.50
c) 10.0
d) 10.5

Answer 1

The best coefficient of performance for a refrigerator that makes liquid nitrogen at -200ºC and has heat transfer to the environment at 35.0ºC is approximately 9.00.

Step-by-step explanation:

The best coefficient of performance possible for a refrigerator can be determined using the formula:

COP = Tc / (Th - Tc)

Where COP is the coefficient of performance, Tc is the cold temperature and Th is the hot temperature. In this case, the cold temperature is -200ºC and the hot temperature is 35.0ºC. Plugging these values into the formula, we get:

COP = -200 / (35.0 - (-200))

COP ≈ 9.00

Therefore, the best coefficient of performance for the refrigerator is 9.00 (option a).