Q$2$: $67kW$ of heat from a condensing refrigerant must be rejected to air by an air$-$cooled condenser. The condenser receives $6\mathrm{.}2\frac{m^3}{s}$ of air with a density of $1\mathrm{.}21k\frac{g}{m^3},$ and its air$-$side area is $198m^2.$ Based on this area, the condenser's overall heat transfer coefficient is $41\frac{W}{m^2}.K.$ What is the highest temperature at which incoming air may be allowed if the condensing temperature is to be kept at $59C?$