Calculate the power required by a system of one compressor serving two evaporators. One evaporator carries a load of 10 tons @ 10C and the other carries a load of 20 tons @ -10C. A back pressure valve reduces the pressure in the 10C evaporator to that of the -10C evaporator. The condensing temperature is 40 and the refrigerant is freon 22 What is the COP?

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