OK, now I see!

At 05:45 AM 8/13/2004 -0700, you wrote:

Mark, Ed took care of that right in the second line "So with Tracy's 30 gpm flow of water = 240 lbs/min"
 
Dave Leonard

Ed,

Please humor me (a non-engineer) while I ask a dumb question.  If it takes 1BTU to raise 1lb of water 1 degree, and you factor in 30 gpm flow to come up with a 2400 BTU requirement for a 10 degree rise for 1 lb of water, where does the number of pounds of water figure into the equation, or do we just ignore that issue?  Water is 8.34 lbs/gal, and say you have 2 gallons of coolant, that would be 16.68 lbs.  Seems that we would need to multiply the 2400 figure by 16.68 to arrive at a total system requirement of 40,032 BTU/min.  What am I missing here?

Mark S.

     At 09:58 PM 8/12/2004 -0400, you wrote:

Right you are, Dave

 

Below  is one semi-official definition of BTU in English units.  1 BTU is amount of heat to raise 1 lb of water 1 degree Fahrenheit.  

 

So with Tracy's 30 gpm flow of water = 240 lbs/min.  Since its temperature is raised 10 degree F we have

 

BTU = 240 * 10 * 1 = 2400 BTU/min

 

I know I'm ancient and  I should move into the new metric world, but at least I didn't do it in Stones and Furlongs {:>)