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Basics of Industrial Heat Pumps 2-35 Physical principles represents the upper theoretical value obtainable in a heat pump system. In practice attainable coefficients of performance are significantly less than COPc. Unfor- tunately, it is difficult to compare the COPs of different categories of IHP, which differ widely for equivalent economic performance. When comparing heat pump systems driven by different energy sources it is more appropriate to use the primary energy ratio (PER) defined as ππΈπ = π’π πππ’ππ hπππ‘ πππππ£ππππ πππππππ¦ ππππππ¦ ππππ’π‘ The equation can be related to the coefficient of performance by the equation ππΈπ = πΓπΆππ where Ζ is the efficiency with which the primary energy input is converted into work up to the shaft of the compressor.PDF Image | Industrial Heat Pumps
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