Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 15 - The Laws of Thermodynamics - Questions: 12

Answer

There is nowhere for the heat removed from the air to be expelled other than back into the room.

Work Step by Step

The “in-room air conditioner” takes in work to enable it to remove heat $Q_{L}$ from the low-temperature region (i.e, cool the room). By conservation of energy, there must be a place where this energy is going, i.e., some heat $Q_{H}$ must be exhausted to a high-temperature reservoir, and $Q_{H} \gt Q_{L}$. In the short run, the heat might be going into a heat sink such as an ice block hidden inside the device. However, in the long run, the “in-room air conditioner” becomes warmer than the room itself and heats up the room.
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