Question

- a vapour-compression air-conditioning cycle where the compressor has an isentropic efficiency of 75%. Refrigerant (R12) is used as the working fluid with a mass now rate of 0.04kg/s. saturated vapour eaters the compressor at 0.5 MPa and leaves to the condenser at 1.2IMPa. The air-conditioner cools down the station to 26°C through an evaporator, and rejects heat to the 34°C ambient through a condenser. (a) Sketch and label the schematic of the air-conditioning cycle and its T-S and P-h diagrams based on the information provided in the above. (b) Determine the net of heat removal from the air-conditioned station. The compressor power in kW. The Coefficient of Performance (COP).

- (R12) is the working fluid in a vapor-compression refrigeration cycle. The evaporator temperature is - 12°C. Saturated vapor enters the turbine. Saturated liquid exits the condenser at 34°C. The mass flow rate of the refrigerant is 5 kg/min. Determine: (a) rate of heat transfer to the refrigerant passing through the evaporator, in kW (b) net power input to the cycle, in kW ' (c) the coefficient of performance

Answer 1