QUESTION $2$

A $6-$cylinder reciprocating R$22-$compressor operating between $-20C$ saturated

suction and $45C$ saturated condensing temperatures has a cylinder bore of $80$ mm

and a stroke of $65$ mm $.$ It runs at $1850re\frac{v}{m}in,$ has a refrigeration capacity of $90$ kW

and a clearance volume of $4\mathrm{.}5\%.$ The drive power is measured at $35$ kW $.$ Assuming

an ideal cycle, calculate:

$2\mathrm{.}1$ The clearance volumetric efficiency

$2\mathrm{.}2$ The actual volumetric efficiency; and

$2\mathrm{.}3$ The compressor efficiency.