The manufacturer of a refrigeration compressor reports the compressor power draw and evaporating capacity as a function of the evaporating and condensing temperatures in the refrigeration cycle. The data for the compressor are shown in Tables P6.11A and 6.11B. Using these data, determine the COPC for a refrigeration system using this compressor at evaporating and condensing temperatures of −12°F and 92.5°F, respectively. Develop the required equation(s) using either the exact fitting method or the method of least squares.

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TABLE P6.11A Power Draw (kW) of a Refrigeration Compressor Condensing Temperature (F) 80 90 100 110 120 Condensing Temperature (F) 80 90 -25 8.00 8.38 8.61 100 110 120 8.64 8.44 TABLE P6.11B Refrigeration Evaporator Capacity (Btu/h) of a Refrigeration Compressor Evaporating Temperature (F) -20 -10 8.46 9.29 8.96 9.94 9.35 10.56 9.59 11.10 9.63 11.51 -15 8,88 9.47 9.99 10.40 10.64 -5 9.73 10.41 11.08 11.72 12.27 -25 -20 -15 50,925 58,918 67,765 47,222 54,946 63,349 43,254 50,838 58,927 38,886 46,460 54,364 33,984 41,678 49,527 Evaporating Temperature (F) -10 -5 77,663 88,807 72,628 82,997 67,716 77,402 62,794 71,946 57,728 66,475