EXERCISE

$10\mathrm{.}13\mathrm{.}31$: $($Problem $10\mathrm{.}31$ in the $9$th edition$).$

Refrigerant $134$a is the working fluid in a vapor$-$compression heat pump that provides $35$ kW to heat a dwelling on a day when the outside temperature is below freezing. Saturated vapor enters the compressor at $1\mathrm{.}6$ bar, and saturated liquid exits the condenser, which operates at $8$ bar. Determine for isentropic compression

$($a$)$ the refrigerant mass flow rate, in $k\frac{g}{s}.$

$($b$)$ the compressor power, in kW$.$

$($c$)$ the coefficient of performance.

$($d$)$ Recalculate the quantities in parts $($b$)$ and $($c$)$ for an isentropic compressor efficiency of $75\%.$