9.15 (35 pts) Repeat Prob. 9–14 using constant specific heats at room temperature. a) do not have to do the T-s diagram (unless you want to) 9-14 An air-standard cycle

with variable specific heats is executed in a closed system with 0.003 kg of air and consists of the following three processes: 1-2 v = constant heat addition from 95 kPa and 17°C to 380 kPa 2-3 Isentropic expansion to 95 kPa 3-1 P = constant heat rejection to initial state (a) Show the cycle on P-U and T-s diagrams. (b)Calculate the net work per cycle, in kJ. Determine the thermal efficiency.