Heat of vaporization. 1

[dbecker]

Hello,

I am trying to find a correlation for the heat of vaporization of water versus temperature.

I found this on wikipedia,

http://en.wikipedia.org/wiki/Enthalpy_of_vaporization

but the graph on the right has no correlation displayed. The purple line is what im looking for.

The purpose of this is to build an equation that can calculate the boiling point of water given temp and pressure without having to use a thermo lookup table.


Thank you

 

[dcasto]

do your own linear regression with excel

or here is an EOS

http://www.icpws15.de/IAPWS_documents/Releases/Ice.pdf

or go here and get the steam tables for excel

http://www.winsim.com/steam/steam.html

 

[chicopee]

What's wrong with dH=Cp*dT where Cp=f(T) found in many textbooks

 

[mbeychok]

debecker:

The data for those curves were obtained from the Dortmund Data Bank ... which is quite expensive to purchase. If you have access to a good university library, they may have a copy available. The URL of the Dortmund Data Bank is:

http://www.ddbst.com/new/Gmehling_book.htm

]

Milton Beychok
(Visit me at www.air-dispersion.com)
.