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Tuesday, November 13, 2012 1:50:20 PM
You say 12,000 Btu/hr of cooling energy. If this is achieved the traditional way, with a compressor, in an enclosed space without the help of the outside environment, then by definition you have to put that exact amount of energy (or more to account for losses) into the compressor. Heat pumps that just move heat from one environment to another are different.
The chiller moves heat from the building to the outside. Although the space is enclosed, the system is not. Specifically, heat from the room is transferred to the water in the air handlers cooling coils. The pumps move that warmed water to the chiller where heat is transferred in the chiller evaporator to the refrigerant (evaporating liquid). The evaporated gas is pulled into the compressor which raises the temp/pressure using mechanical energy. The hot gas is put into the chiller's condensor, condensing back to a hot liquid, using cooling tower (which is outside) water. The final step is to eject that heat out the cooling tower.
Now it doesn't matter if a chiller system is used or a window unit in a home. Heat is mostly moved with some created. Th
Heat Pumps are the same units, but rather than just dump the heat to the outdoors, it is recovered and used (to make hot water, for example). So bottomline all airconditioning or heat pumps using compressors move heat more than create it.
In the case of the magnetron, I don't see heat moving but rather created from electricity...thus can't be over 100% efficient.

