Engineering, 21.07.2020 18:01 hebiancao

An insulated open feedwater heater (mixing box) is used in a steam power plant to raise the temperature of the water going into the boiler which increases the thermal efficiency. The water exits the feedwater heater as a saturated liquid at P6 with a mass flow rate of m6. The two inlets to the feedwater heater are both at a pressure of P6 The first inlet has a temperature of T3 and second at a temperature of T5. Determine the following given the properties listed below. --Given Values P6 (Bar) = 5 m6 (kg/s) 66 T3 (C) 336 T5 (C) 95 1. Determine the specific enthalpy (kJ/kg) at the feedwater heater exit.
2. Determine h3, the specific enthalpy (kJ/kg) at the first feedwater heater inlet.
3. Determine h5, the specific enthalpy (kJ/kg) at the second feedwater heater inlet.
4. Determine m3, the mass flow rate (kg/s) at the first feedwater heater inlet.
5. Determine m5, the mass flow rate (kg/s) at the second feedwater heater inlet.

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An insulated open feedwater heater (mixing box) is used in a steam power plant to raise the temperat...

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