Engineering, 29.01.2020 05:40 jumpman2344

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) = 72
t3 (c) = 281
t5 (c) = 65

1. determine the specific enthalpy (kj/kg) at the feedwater heater exit.
your answer =
2. determine h3, the specific enthalpy (kj/kg) at the first feedwater heater inlet.
your answer =
3. determine h5, the specific enthalpy (kj/kg) at the second feedwater heater inlet.
your answer =
4. determine m3, the mass flow rate (kg/s) at the first feedwater heater inlet.
your answer =
5. determine m5, the mass flow rate (kg/s) at the second feedwater heater inlet.
your answer =

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