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Posted by HeatPro on September 25, 2008 at 09:43:48:

In Reply to: formula of making total steam posted by salman gulfam on September 25, 2008 at 06:21:17:

You are looking for the idea that

the amount of heat in the fuel gas

modified by the thermal efficiency of the exchanger

yields heat into the water to provide the change of

water to steam.

Approximation can be:

100,000 btuh in a therm of natural gas

divided by an efficiency of 80% = 80,000 btuh

divided by c. 1000 btuh (972.4 latent and some sensible heat) to convert a pound of water to steam

equals the conversion of 8 pounds of water to steam in an hour.

So a therm can convert a gallon of water to steam in an hour.

gather 'real-world' figures of efficiency and temperature change for more exact answers.

http://books.google.com/books?id=IZx9AAAAIAAJ&pg=PT60&lpg=PT60&dq=972.4+latent&source=web&ots=2TW9UKW9kG&sig=jrRf3w78jgCRZsOFT5mMLQW6nfY&hl=en&sa=X&oi=book_result&resnum=3&ct=result