An R-717 (ammonia) system operates on the basic vapour compression refrigeration cycle. The evaporator and the condenser pressure and the condenser pressures are 0.119 MPa and 1.389 MPa respectively. The mass flow rate of refrigerant is 0.1 kg/s. If the volumetric efficient of the compressor is 85%. Determine of the compressor displacement rate. If the CP of the cycle 2, determine the power input to the compressor.
Saturation properties of R-717 (ammonia)
|
Temp. 0C
|
Pressure MPa
|
Specific Volume m3/kg
|
Enthalpy kJ/kg
|
|
Liquid
|
Vapour
|
|
–30
|
0.119
|
0.9638
|
63.9
|
1423.6
|
|
36
|
1.389
|
0.0930
|
371.4
|
1488.6
|