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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–1 K–1

• 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?

Further Data:

The flue gases produced are to be used to generate 5 bar steam from water at 90ºC

The total flow of flue gases is 1400 kmol h–1


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