If the flue gases exiting the boiler are used to preheat the water fed to the boiler from a...

Question

If the flue gases exiting the boiler are used to preheat the water fed to the boiler from a temperature of 28oC to 90oC and assuming:

• a mean specific heat capacity for water over this temperature range to be 4.2 kJ kg–1K–1

Teesside University Open Learning

(Engineering)

4

a mean molar heat capacity for the flue gases up to 300oC to be 31 kJ kmol–1K–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 and state if the dew point will be reached in both of the cases given in part (j).

David · Accepted Answer

Total heat in = total heat out 
Flue gas flow rate * heat content = (sum of pre-heat) / 0.9 + heat content of steam – ( I ) 
Flue gas flow rate * heat content = (sum of pre-heat) / 0.

If the flue gases exiting the boiler are used to preheat the water fed to the boiler from a temperature of 28oC to 90oC and assuming: • a mean specific heat capacity for water over this temperature...

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