A refrigeration system using R-22 as the refrigerant is to have a refrigerating capacity of 80 kW.

1.A refrigeration system using R-22 as the refrigerant is to have a refrigerating capacity of 80 kW.

The cycle is a vapor compression cycle with an evaporating temperature of -10oC and a condensing

temperature of 40oC. The vapor entering the compressor has a 5oC of superheat, while the liquid

refrigerant leaving the condenser has a 4oC of subcooling. Determine the volume flow rate of

refrigerant in m3/s at the compressor suction port and the power required by the compressor.

2.For the information given in Problem 1 above, perform a design for the case of a reciprocating

compressor. Select the number of cylinders, the bore, the stroke, the number of revolutions per

minute, and make the appropriate calculations for the volumetric efficiency. Assume that the

compression is non-isentropic with an isentropic efficiency of 80%. Justify all your calculation

steps.