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Wikipedia definition
1. Coefficient of performanceThe coefficient of performance or COP (sometimes CP), of a heat pump is the ratio of the change in heat at the "output" (the heat reservoir of interest) to the supplied work. The COP was created to compare heat pumps according to their energy efficiency.
Read “Coefficient of performance” on English Wikipedia
Read “成績係数” on Japanese Wikipedia
Read “Coefficient of performance” on DBpedia

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