2.3 A kitchen is provided with a standard refrigerator and a window air conditioner. How is it that the refrigerator hea

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2 3 A Kitchen Is Provided With A Standard Refrigerator And A Window Air Conditioner How Is It That The Refrigerator Hea 1 (104.37 KiB) Viewed 31 times

2.3 A kitchen is provided with a standard refrigerator and a window air conditioner. How is it that the refrigerator heats the kitchen whereas the air conditioner cools it? Both the refrigerator and the air conditioner are heat pumps, and both most likely operate on the same principle and are mechanically very similar. The difference lies in the fact that heat discarded by the refrigerator enters the room (often through coils below or on the back of the refrigerator) whereas heat is discarded by the air conditioner outside the window. The situation is depicted in Fig. 2-8. WA 0₂ A Q₁ KITCHEN Refrigerator "cold box" Q Fig. 2-8 WB B The heat pumps are indicated by circles; the one designated A is in the refrigerator, and B is in the air conditioner. The work to drive both heat pumps is presumed to be supplied electrically, and this energy comes from outside the kitchen as shown. The refrigerator heat pump A removes heat |Q₁" from the refrigerator "cold box" and discards heat Q2 into the kitchen. An energy balance on heat pump A shows that Q₁ = Q₁+ W^. Now if the "cold box" of the refrigerator stays at constant temperature, then the heat pump removes just the amount of heat that passes into the cold box, through its walls. heat in an from the kitchen. Thus the net effect of the refrigerator on the kitchen is to add energy amount equal to the work W of running the refrigerator.