Heat loss Calculation

[tatters]

I am having a issue working out the heat lost of a building assembly does anyone know of a way to calculate the following? does not seem to be much info on-line to work out for a entire year.

A 258.55m2 area with RSI of 1.40 has a heat loss of 69356.74MJ over a year.

What would the same areas heat loss be if the RSI is 2.84?
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[Easy-X]

Surface area in metres squared * (temperature differential / RSI) = energy loss in Watts

69356.74MJ per year = 2197.83W (1MJ per year = 0.031688764615413W)

258.55 * ( t / 1.40) = 2197.83
so your temperature differential = 12 degrees Celsius? Sounds about right...

258.55 * ( 12 / 2.84 ) = 1092.46W

1092.46W = 34474.68MJ per year
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[stinkwheel]

Surely the heat loss of any building is 100% of the heat you put into it?
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[Easy-X]

[tatters]