(Solved): An air conditioner based on the vapor-compression refrigeration cycle uses \( \mathrm{R}-134 \mathr ...

An air conditioner based on the vapor-compression refrigeration cycle uses \( \mathrm{R}-134 \mathrm{a} \) as the working fluid. The air conditioner will used to \( c 0 o l \) a \( 0.3 \mathrm{~kg} / \mathrm{s} \) stream of dry air from \( 40^{\circ} \mathrm{C} \) to \( -5^{\circ} \mathrm{C} \). The air conditioner operates in \( 40^{\circ} \mathrm{C} \) surroundings and the compressor efficiency is \( 75 \% \). a) Select evaporator and condenser pressures that will allow heat to be transferred from the air stream to the R-134a in the evaporator, and from the R-134a to the surroundings in the condenser. b) Find the coefficient of performance of the refrigeration cycle. c) Find the power input needed to operate the air conditioner, in \( \mathrm{kW} \). Use Cengel's R-134a tables posted on Canvas to model the refrigerant.