A refrigeration cycle utilizes a compressor which is $80$ percent efficient; it accepts R$134$a as saturated vapor at $-24\backslash$deg C$.$ The liquid leaving the condenser is at $800$ kPa and $30\backslash$deg C$.$ For a mass flux of $0\mathrm{.}1$k$$ calculate $($a$)$ the COP, $($b$)$ the tons of refrigeration, and $($c$)$ the mass flux of condenser cooling water for a temperature rise of $10\backslash$deg C$.$