Refrigeration system for refrigerant steam compression cycle R12 with one compressor serving two evaporators, each of which has a refrigeration capacity of 10 tons at 440 F and 30 tons at 34 0F. If each evaporator has an expansion valve and a back pressure valve. Count,
1. Refrigerant effect, the rate at which the refrigerant enters the compressor.
2. Performance coefficient, compressor outlet temperature and required power.
3.Complete with the cycle scheme and the P - h diagram (NOTE: 1 Ton = 200 Btu / minute)

*note : temperature in the picture is in F not C

 

Transcribed Image Text:

Saturated Suction vapor- <<-5°C Subcooled liquid 28°C -5°C vaporizing temperature Heat exchanger 40°C condensing temperature Superheated -suction vapor- 15°C 7 Saturated liquid 40°C Saturated Suction vapor- <<-5°C Subcooled liquid 28°C -5°C vaporizing temperature Heat exchanger 40°C condensing temperature Superheated -suction vapor- 15°C 7 Saturated liquid 40°C