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MEXICOWANDERER's avatar
Jun 19, 2017

Wrong Season But Great Formula...

I came across this worksheet formula that calculates HEATING BTU values and rather than lose it before next winter, decided to copy and I am going to paste it in my Word program files...

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You can calculate the amount of BTUs required by using the following method: Measure the space’s dimension to determine cubic feet. (Length x Width x Height = Cubic Feet). Subtract the outside temperature from the desired inside temp to determine the temperature increase. If you have measured temperature in Fahrenheit, calculate the required BTUs with this formula: (Cubic Feet x Temperature Increase x .133 = Required BTUs) If you have measured temperature in Celsius, calculate the required BTUs with this formula: (Cubic Feet x Temperature Increase x .2394 = Required BTUs)

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  • It has been well over 50 years but I think you need to know something about air exchange. How big is the door and how often does it open.
  • wa8yxm's avatar
    wa8yxm
    Explorer III
    Also the R factor of the walls, floors and roof/ceiling. A very incomplete formula.

    NOTE BTU's cooling.. same calculations, Including all the variables that the O/P did not include (Door, R,Factor, Amount of glass, and so on.)
  • Per Suburban, you use 1 FOOT per BTU. 30 foot RV=30 BTU furnace. Doug

    Boy, that was quick:B
  • Perhaps per thousands of BTUs Mr. Grainer? :) I had a 44,000 BTU wall heater in a 650 square foot home (?) in the mountains that blew me out at -29F. Ceiling insulation, no wall insulation and single windows.

    Well, back to the dart board...

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