Academics – Applied Heat : 2017/OCT/06
Question
Q6. A vapour compression refrigerant plant uses R134a and operates between saturation temperatures of -20℃ and 40℃. The refrigerant leaves the evaporator at -10℃ and leaves the compressor at 60oC.
The heat removed in the condenser is 199.63 kJ/kg of refrigerant flowing and the cooling load is 60 MJ/hour.
(a) Sketch The cycle on Pressure-specific enthalpy and Temperature-specific entropy diagrams. (4)
(b) Calculate EACH of the following:
(i) The degree of undercooling in the condenser; (4)
(ii) The mass flow rate of liquid refrigerant entering the evaporator; (6)
(iii) The coefficient of performance. (2)
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