Flue gas exiting the boiler are used to preheat the water fed to the boiler from a temperature of 28°C to 90°C assuming:
A mean specific heat capacity for water over this temperature range to be 4.2kJkg-1K-1
A mean molar heat capacity for the flue gases up to 300°C to be 31kJKmol-1K-1
10% of the heat required to heat the water is lost in the heat exchanger
All water entering is converted to steam
Frome earlier answers in this question I have steam raised = 42831.3kgh-1 and the flame temperature to be 2148°C
the question asks: Determine the final outlet temperature?
Could somebody give me the equation(s) I need to get this answer?