This means that energy will not flow from cold to hot regions without outside assistance. The Clausius statement of the Second Law of Thermodynamics asserts that it is impossible to construct a device that, operating in a cycle, has no effect other than the transfer of heat from a cooler to a hotter body. Therefore, this section will concentrate on refrigeration and only make the distinction between the two devices when necessary. The distinction between a refrigerator and a heat pump is one of purpose rather than principle. In this case the device is called a Heat Pump. ![]() ![]() ![]() The same device can be used to heat a volume that is at higher temperature than the surroundings. A refrigerator is a device which is designed to remove heat from a space that is at lower temperature than its surroundings.
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