Steam enters a counterflow heat exchanger operating at steady state at 0.04 mpa with a quality of 0.9 and exits at the same pressure as saturated liquid. the steam mass flow rate is 1.6 kg/min. a separate stream of air with a mass flow rate of 100 kg/min enters at 30°c and exits at 60°c. the ideal gas model with cp = 1.005 kj/kg·k can be assumed for air. kinetic and potential energy effects are negligible. determine the temperature of the entering steam, in °c. for the overall heat exchanger as the control volume, what is the rate of heat transfer, in kw.