Question

1. (20 points) An ideal vapor-compression refrigeration cycle operates at a steady state with Refrigerant 134a as the working fluid. Saturated vapor enters the compressor at -10°C, and saturated liquid leaves the condenser at 28°C. The mass flow rate of refrigerant is 5 kg/min. Show the process on a T-S diagram labeling the two temperatures on the y-axis and determine: (a) The compressor power, in kW. (b) The refrigerating capacity (?in), in tons (1 ton = 211 kJ/min). (c) The coefficient of performance. Take: h_evaporator,out = h_compressor,in = 241.35 kJ/kg h_compressor,out = h_condenser,in = 267.9 kJ/kg h_valve,out = h_evaporator,in = 88.61 kJ/kg

          1. (20 points) An ideal vapor-compression refrigeration cycle operates at a steady state with Refrigerant 134a as the working fluid. Saturated vapor enters the compressor at -10°C, and saturated liquid leaves the condenser at 28°C. The mass flow rate of refrigerant is 5 kg/min. Show the process on a T-S diagram labeling the two temperatures on the y-axis and determine:

(a) The compressor power, in kW.
(b) The refrigerating capacity (?in), in tons (1 ton = 211 kJ/min).
(c) The coefficient of performance.

Take: h_evaporator,out = h_compressor,in = 241.35 kJ/kg
h_compressor,out = h_condenser,in = 267.9 kJ/kg
h_valve,out = h_evaporator,in = 88.61 kJ/kg

1. (20 points) An ideal vapor-compression refrigeration cycle operates at a steady state with Refrigerant 134a as the working fluid. Saturated vapor enters the compressor at -10°C, and saturated liquid leaves the condenser at 28°C. The mass flow rate of refrigerant is 5 kg/min. Show the process on a T-S diagram labeling the two temperatures on the y-axis and determine:

(a) The compressor power, in kW.
(b) The refrigerating capacity (?in), in tons (1 ton = 211 kJ/min).
(c) The coefficient of performance.

Take: hevaporator,out = hcompressor,in = 241.35 kJ/kg
hcompressor,out = hcondenser,in = 267.9 kJ/kg
hvalve,out = hevaporator,in = 88.61 kJ/kg

Added by Erica H.

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