An inventor claims to have developed a food freezer that at steady state requires a power input of 0.25 kW to extract energy by heat transfer at a rate of 3000 J/s from freezer contents at 270 K. Investigate this claim for an ambient temperature of 293 K.

investor claim is acceptable

Explanation:

given data

Win = 0.25 kW

Qc = 3000 J/s = 3kW

Th = 293 K

Tc = 270 K

solution

we get here coefficient of performance of cycle is

coefficient of performance =    ..................1

put here value and we get

coefficient of performance =  

coefficient of performance = 1.2

and

coefficient of performance of ideal refrigeration is

coefficient of performance =    ..................2

coefficient of performance =  

coefficient of performance = 11.74

and

we can see here that coefficient of performance of ideal refrigeration  is is more than real cycle coefficient of performance

so investor claim is acceptable

efficiency of reversible power cycles operating between a hot re

explanation:

answer:

a

explanation: