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An ammonia refrigerator operates between evaporating and condensing temperatures of -16 and 50degrees. The vapor is dry saturated at the compressor inlet and there is no undercooking of the condensate. Calculate:(i) the refrigerating effect
(ii) the mass flow rate per kilowatt of refrigeration capacity
(iii) the power input per kilowatt of refrigeration capacity
(iv) the COP ref.