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BTU Formula

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Lefty

11-18-2007 08:21:20

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Room area(LxWxH)x.133x degree of temperature rise desire...For instance,a garage 20'x12'x8'=1920 cubic feet Temp rise(-10 outdoor to +68 indoor)78 degrees So,1920x.133x78=19,918.08 BTU.So a 20,000 BTH heater would do the job,but would be operating a maximum output,unless bldg is tight and well insulated.Note#This is ONLY a rough estimator gauged for general heating of an average outbuilding.A well insulated tight building would require less heat,and a loose building or one with several windows/doors may require additional BTUs.

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Charles (in GA)

11-18-2007 13:46:44

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Re: BTU Formula in reply to Lefty, 11-18-2007 08:21:20

Doing this calculation with my insulated metal building yields about 4 million BTU's required.

Thats a 60x60x16eave steel building with a 12/2 roof. That works out to 66,000 cu/ft times 133 times 45 degree temp rise (20 to 65 and thats extreme for around here) and I get 398601000, and it appears you shift the dec two places and I get 3 million and 986 thousand. Is that right?

I've been looking at used/waste oil heaters and figure that a 250K BTU will probably make the place comfortable most of the time.

Charles

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Lefty

11-18-2007 15:19:36

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Re: BTU Formula in reply to Charles (in GA), 11-18-2007 13:46:44

60x60x16=57600 cubic feet of area,x.133=7660.8, x 45 degree rise=344736 BTUs req.

Multiplier is Point 133(.133)

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Charles (in GA)

11-18-2007 16:04:36

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Re: BTU Formula in reply to Lefty, 11-18-2007 15:19:36

You forgot to include the area from the eave to the peak. 16 ft eave, 12/2 means a 21 ft peak. Thats equal to a 60x30x5 area, thats another 9000 cu ft. plus the 57,600 equals 66,600 cu/ft.

Charles

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Charles (in GA)

11-18-2007 16:17:56

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Re: BTU Formula in reply to Charles (in GA), 11-18-2007 16:04:36

Sorry, in my original post I put 66,000, meant to put 66,600.

So thats 66,600 x .133 x 45 = 398,601 or 400K BYU.

Realizing that 20 degrees is kinda rare around here, lets bump it to 30 degrees raising it to 65 degrees.

66,600 x .133 x 35 = 310,023 so my original guess of 250K BTU heater is not far off. Lost of variables of course. This building has one wall (east, morning sun, = good) that is a 14hx56w door system skinned with translucent fiberglass so no insulation there. Also a north side 10x10 sheet metal roll up door, and a west side 12wx14h glass garage door (west sun = afternoon warmth) plus a couple of man doors with glass in the top half.

Even on a very cold morning, when I step into it, it is surprisingly warm inside, I've never seen it reach freezing inside in the 7 years its been up, and usually won't go below 40, so I could back off my temp rise requirements even further.

Charles

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buickanddeere

11-18-2007 15:12:51

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Re: BTU Formula in reply to Charles (in GA), 11-18-2007 13:46:44

1 watt = 3.41 btu

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