[Stoves] Water vapor calc.
Tom Miles
tmiles at trmiles.com
Tue Dec 20 18:54:20 CST 2011
Dear Stovers,
A few questions if you don't mind.
Enthalpy of water is 104.73 kj/kg at 25 deg. C
We need to add 4.186 kj/kg/deg. C (4.186 X 75) 314 to equal 419 to reach 100
deg. C
We need to add (2675 - 419) =2256 kj/kg to get to a vapor. And have enthalpy
of 2675 kj/kg at 100 deg. C.
But then the water vapor goes up to 400 deg. C in a stack.
So we add 1.72 kj/kg / deg. C or 300 X 1.72 = 516. So 516 + 2675 = 3191
kj/kg in the water vapor at 400 deg C. (?)
When the vapor cools off it releases a lot of energy. Its interesting to me
that water vapor at 25 deg. C has so much more energy than water in a
liquid!
How does humidity calculate into all this?
Thanks
Frank
Frank Shields
42 Hangar Way
Watsonville, CA 95076
(831) 724-5244 tel
(831) 724-3188 fax
frank at bioCharlab.com
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