As a refrigeration Engineer, you have to choose between two refrigeration plants for a cold room. The Plant specifications are given below. PLANT 1: Vapour compression refrigeration plant with Refrigerant R-12 110 kW Cooling Capacity Evaporator pressure is 2.61 bar Condenser pressure is 9.607 bar. Vapour is dry saturated entering the compressor Liquid leaves the condenser at 35 C. Compression is isentropic PLANT 2: Vapour compression refrigeration plant with Refrigerant R-134a 110 kW compressor Evaporator pressure is 2.43 bar Condenser pressure is 14.91 bar. Vapour is dry saturated entering the compressor Liquid leaves the condenser at 45 C. Compression is isentropic Note: The cost of refrigerant in Plant lis three (3) times the cost of that in Plant 2 (a) Demonstrate by calculations which of the Plant you will select, and state the three (3) critical criteria that influenced your decision. (15, 9 marks) (b) What are the implications of the type of refrigerant used? (6 marks) ALL workings must be shown. Marks will be deducted if workings are not shown!