Steam enters a counter flow heat exchanger operating at stead state at 0.07 MPa with a specific enthalpy of 2431.6 kJ/kg and exits at the same pressure as saturated liquid. The steam mass flow rate is 1.5 kh/min. A separate stream of air with mass flow rate of 100 kg/min enters at 30C and exits at 60C. The ideal gas model with cp=1.005 kJ/kg*K can be assumed for air. Kinetic and potential energy effects are negligible. Determine:
a) The quality of the entering steam
b) The rate of heat transfer between the heat exchanger and its surroundings in kW