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11Q

Expert-verified
Found in: Page 412

Physics Principles with Applications

Book edition 7th
Author(s) Douglas C. Giancoli
Pages 978 pages
ISBN 978-0321625922

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

The COP of the heat pump is as follows:

$$COP = \frac{{{Q_{\rm{H}}}}}{W}$$

The COP of the air conditioners is as follows:

$$COP = \frac{{{Q_{\rm{L}}}}}{W}$$

See the step by step solution

Step 1: 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.

Step 2: 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 conditioners is 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.