A $6-$cylinder reciprocating ammonia compressor between $-10$C saturated suction and

$30$C saturated condensing temperatures has a cylinder bore of $80$ mm and a stroke

of $65$ mm$.$ It runs at $1850$ rev$/$min$,$ has a refrigerating capacity of $90$ kW and a

clearance of $5\%.$ The drive power is measured at $35$ kW$.$ Assuming a standard cycle,

calculate:

$4\mathrm{.}1$ the compressor displacement $(2)$

$4\mathrm{.}2$ the clearance volumetric efficiency $(2)$

$4\mathrm{.}3$ the actual volumetric efficiency, and $(12)$

$4\mathrm{.}4$ the compressor efficiency