(Solved): Refrigerant R-134a enters the compressor of a vapor-compresion cycle at 120kPa as a saturated vapor ...

Refrigerant R-134a enters the compressor of a vapor-compresion cycle at $120\mathrm{kPa}$ as a saturated vapor and leaves at $900\mathrm{kPa}$ and $75^{?}\mathrm{C}$. The refrigerant leaves the condenser as a saturated liquid. The rate of cooling provided by the system is $5.275\mathrm{kW}$. Determine the: a) Flow rate of the $\mathrm{R}?134\mathrm{a}$ (6 marks) b) COP of the cycle (2 marks) c) COP of the cycle if the expansion valve is replaced by an isentropic turbine. Would you recommend such a replacement? (4 marks) Page 4 of 5 d) COP of the evaporator pressure is $160\mathrm{kPa}$ and other values remain the same (4 marks) e) COP if the condenser pressure is $800\mathrm{kPa}$ and other values remain the same (4 marks)