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The refrigerator shown in Fig. P6.28 operates at steady state with a coefficient of performance of 4.5 and a power input of 0.8 kW. Energy is rejected from the refrigerator to the

The refrigerator shown in Fig. P6.28 operates at steady state with a coefficient of performance of...

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surroundings at 20 C by heat transfer from metal coils attached to the back. Determine

(a) the rate energy is rejected, in kW.

(b) the lowest theoretical temperature inside the refrigerator, in K.

Determine the minimum theoretical power, in Btu/s, required at steady state by a refrigeration system to maintain a cryogenic sample at 195 F in a laboratory at 70 F, if energy leaks by heat transfer to the sample from its surroundings at a rate of 0.085 Btu/s.

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