Posted by jay on Sunday, November 25, 2012 at 3:28pm.
As Bob Pursley said
In general:
heat=mass*specificeheat*changetemp
or
heat in = mass of water * specific heat of water * (Final temp -original temp)
In these strange English units
weight in pounds is used for mass
weight = 500 gal * 8.31 pounds/gal = 4155 pounds
specific heat of water in these units = 1 BTU/pound
change in temp = 160 - 70 = 90 degrees F
so
BTU = 4155 * 1 * 90
= 373,950 BTU
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