A freezer is maintained at 20 F by removing heat from it at a rate of 75 Btu/min. The power input...

Question:

A freezer is maintained at 20{eq}^{\circ} {/eq}F by removing heat from it at a rate of 75 Btu/min. The power input to the freezer is 0.70 hp, and the surrounding air is at 75{eq}^{\circ} {/eq}F. Determine

(a) the reversible power

(b) the irreversibility and

(c) the second-law efficiency of this freezer.

Freezer:

A freezer is a closed cabinet used to preserve food by maintaining a very low temperature. A freezer is used in households refrigerator to make ice cubes and prevent the melting of ice creams. It keeps the food frozen.

Answer and Explanation:

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Given Data


  • Low temperature reservoir, {eq}{T_L} = 20^\circ {\rm{F}} {/eq}.
  • Heat removal rate, {eq}{\dot Q_L} = 75\;{\rm{Btu/min}} {/eq}.
  • Surrou...

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