   Chapter 5, Problem 38Q

Chapter
Section
Textbook Problem

(¦ Indicates a review question, which means it requires only a basic understanding of the material to answer. Questions without this designation typically require integrating or extending the concepts presented thus far.). ¦ In winter, the amount of internal energy a heat pump deliver to a house is greater than the electrical energy it uses. Does this violate the law of conservation of energy? Explain.

To determine

Whether a heat pump operating during winters violates the law of conservation of energy or not.

Explanation

Given information:

During winters, a heat pump delivers internal energy greater than the input electrical energy it uses.

The construction of a heat pump is as shown in figure, comprising condenser, evaporator, expansion valve and compressor. The equation that explains the working principle of this pump is as:

Qh=Qc+W

Where,

Qc is the heat transfer between the working fluid and the outside air.

Qh is the heat transfer from the pump to the room.

W is the work done by the compressor using electrical energy

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