Anybody know how i can calculate the marginal costs of steam generated through cogeneration or have any rules of thumb? ($ per unit of usable heat energy)
The natural gas price is approximately $4/mmbtu and the pressure of the steam is about 125 psig. I don't know what the temperature of the feedwater would be.
If only it were true! Demin water, feedwater treatment chemicals, cooling tower make-up water, more chemicals, etc all need to be factored in. Sadly none are free.