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SheldonEinstein
 2 years ago
Best ResponseYou've already chosen the best response.1Heat pumps, by contrast, use work to cause thermal energy to flow from low to high temperature, the opposite direction heat would flow spontaneously. An example is a refrigerator or air conditioner, where electric power is used to cool a low temperature system (the interior of the refrigerator) while heating a higher temperature environment (the exterior). High efficiency is achieved when the temperature difference is small. Found the above ... here : http://en.wikipedia.org/wiki/Heat I didn't know about it actually, so just searched net and found this, may this help you?
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