An ammonia refrigerator operates between evaporating and condensing temperatures of –16 and 50 oC. The vapour is dry saturated at the compressor inlet, and there is no undercooling of the condensate. Calculate: (A) the refrigerating effect. (B) the mass flow rate per kilowatt of refrigeration capacity. (C) the power input per kilowatt of refrigeration capacity. (D) The COPref. (6 marks) (b) In the plant of part (a), please re-design the refrigerator if it is