4 56 WP Steam enters a counterflow heat exchanger operating at steady state at 0 07 MPa with a specific enthalpy of 2431 6 kJ kg

Question

4 56 WP Steam enters a counterflow 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 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 negligi ble Determine a the quality of the entering steam and b the rate of heat transfer between the heat exchanger and its surroundings in kW

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