Close$-$Ended Problem

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 $-10C$ and a condensing

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

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

refrigerant in $\frac{m^3}{s}$ at the compressor suction port and the power required by the compressor.

Open$-$Ended Problem

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.

Open$-$Ended Problem

Repeat the above steps for a rotary$-$vane compressor. Select the number of vanes, etc., among the

design quantities that are relevant to such a compressor.

Open$-$Ended Problem

Repeat the above steps for a rolling piston compressor.

Open$-$Ended Problem

Repeat the above steps for a screw compressor. Select the number of lobes, etc., among the design

quantities that are relevant to such a compressor.