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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
Calculate the specific heat capacities of the gas at constant volume and constant pressure, the initial pressure of the gas and the change in volume of the gas when it was heated at constant pressure.
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