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


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.


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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Types of Heating & Cooling Systems


Chapter 10 / Lesson 9

You can choose from a number of different heating and cooling systems to make your home comfortable to live in. Watch this video to learn about the advantages and disadvantages of forced air, radiant heat, baseboard heat and geothermal systems.

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