Steam enters a heat exchanger operating at steady 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 kg/min. a separate stream of air with a mass flow rate of 100 kg/min enters at 30 degrees celsius and exits at 60 degrees celsius. 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 and b) the rate of heat transfer between the heat exchanger and its surroundings, in kw. hint: (b) use the relationship between the change in enthalpy and the change in the temperature for an ideal gas.