Question: Saturated steam is generated in a boiler by converting a saturated liquid to a saturated vapor at 2 0 0 psia. This is done by

Saturated steam is generated in a boiler by converting a saturated liquid to a saturated vapor at

200

psia. This is done by transferring heat from the combustion gases, which are at

660 F,

to the water in the boiler tubes. Calculate the exergy destroyed by this heat transfer process. How does increasing the temperature of the combustion gases affect the exergy change of the steam stream? Take

T_{0} = 80 F

and

P_{0} = 14.7

psia. Use steam tables.

The exergy destroyed by this heat transfer process is

Btu

/

lbm

.

q,

Saturated steam is generated in a boiler by

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