Steam enters a counterflow heat exchanger operating at steady state at 0.07MPa with a specific enthalpy of 2317.5kJ/kg and exits at the same pressure as saturated liquid. The steam mass flow rate is 1.5kg / min. A separate stream of air with a mass flow rate of 90kg/min enters at 30C and exits at 60C. The ideal gas model with cp=1.005kJ/kgK can be assumed for air. Kinetic and potential energy effects are negligible. Determine [15 pts] (a) the quality of the entering steam, and [15 pts] (b) the rate of heat transfer between the heat exchanger and its surroundings, in kW