A flue gas is cooled from 1.100 to I50oC and the heat is used to generate saturated steam at 100 C in a boiler. The flue gas has a heal capacity given by:

Water enters the boiler at l00oC, and is vaporized at this temperature; its latent heat of vaporization is 2,256.9 kJ kg-1.
(a) With reference to a surroundings temperature of 25oC, what is the lost work of this process in kJ mol' 1 of flue gas?
(b) With reference to a surroundings temperature of 25oC, what is the maximum work in kJ mol-1 of flue gas that can be accomplished by the saturated steam at 100oC if it condenses only, and does not subcool?
(c) How does the answer to Pan (b) compare with the maximum work theoretically obtainable from the flue gas itself as it is cooled from 1,100 to 150oC?

Transcribed Image Text:

Ср ー= 3.83 + 0.00)551 T/K