It doesn't work that way. There is not a certain number of btus to raise air temperature. You would have to know how much air.
A BTU is the British Thermal Unit. That is the amount of energy required to raise the temperature of one pound of water one degree F.
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U.S.gallon = 8.33 pounds of water. Therefore to raise the temperature by one degree F will require 8.33 BTU. The initial temperature of 50 F is inconsequential.
A US gallon of water is about 8.4 lb, so 30,000 galls is 252,000 lb. One BTU is the heat to raise one pound of water by one degF, so BTU's in your example are 252,000 x 15 = 3,780,000 BTU.
0.104 btu
answer: 7680 btu 1 gallon= 8 lb 130F-50F=80F 12G*8LB*80F=7680 BTU
That would depend on the size of the room and the humidity.