[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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