Subject: How do I calculate energy content of steam at known P, T, and V?

Hi.  I was wondering if you could answer my question or point me in a 
direction.  I am interested in working with steam engines.  I have a boiler, 
and I know the pressure (in PSI), volume (in CFM), and temperature (F) of the 
steam coming from my boiler.  I would like to have a formula which tells me how 
to convert this information into WATTS.  

I will use this steam to power a steam engine, and run a generator.  So, if I 
know the power of the steam in watts, I can determine the efficiency of the 
engine.

Any help will be greatly appreciated!

Thank you,

David

Re: How do I calculate energy content of steam at known P, T, and V?