- #1
Mitch1
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Homework Statement
- If the flue gases exiting the boiler are used to preheat the water fed to the boiler from a temperature of 28 C to 90 C and assuming:
- a mean molar heat capacity for the flue gases up to 300oC to be 31 kJ kmol–1 K–1
- 10% of the heat required to heat the water is lost in the heat exchanger
- all water entering the system is converted to steam
determine the final outlet temperature of the flue gas
Homework Equations
pw = (mole fraction)water × total pressure
The Attempt at a Solution
I'm not sure where to start off on this once as it does not state any pressure the steam is at, I thought you needed a pressure to multiply by the mole fraction to then obtain a temperature using steam tables?
Any help/suggestions on equations would be much appreciated -thanks