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Chapter 15: 11Q (page 412)

Question:The COPs are defined differently for heat pumps and air conditioners. Explain why.

Short Answer

Expert verified

The COP of the heat pump is as follows:

\(COP = \frac{{{Q_{\rm{H}}}}}{W}\)

The COP of the air conditioners is as follows:

\(COP = \frac{{{Q_{\rm{L}}}}}{W}\)

Step by step solution

01

Coefficient of performance (COP)

The term coefficient of performance describes the effectiveness of a certain device like heat pump or refrigerator at transferring rate and the quantity of power consumed by the device.

02

Explaining the difference in COP of heat pumps and air conditioners

The relation of COP of the heat pumps is given by:

\(COP = \frac{{{Q_{\rm{H}}}}}{W}\)

The coefficient of performance of the heat pump relies on the amount of heat delivered. The main objective of this device is to heat instead of cool. In order to make the working of the heat pump better, more heat should be delivered per amount of input work.

The relation of COP of theair conditionersis given by:

\(COP = \frac{{{Q_{\rm{L}}}}}{W}\)

The coefficient of performance of the air conditioners relies on the amount of heat removed from the reservoir. The main objective of this device is cooling instead of heating.

In order to make the working of the air conditioners better, increase the amount of heat extracted per amount of input work.

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Most popular questions from this chapter

Question:You are asked to test a machine that the inventor calls an “in-room air conditioner”: a big box, standing in the middle of the room, with a cable that plugs into a power outlet. When the machine is switched on, you feel a stream of cold air coming out of it. How do you know that this machine cannot cool the room?

(a) What happens if you remove the lid of a bottle containing chlorine gas? (b) Does the reverse process ever happen? Why or why not? (c) Can you think of two other examples of irreversibility?

Question: Living organisms, as they grow, convert relatively simple food molecules into complex structures. Is this a violation of the second law of thermodynamics? Explain your answer.

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Question: Give three examples, other than those mentioned in this Chapter, of naturally occurring processes in which order goes to disorder. Discuss the observability of the reverse process.
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