- #76
OmCheeto
Gold Member
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Ratios!...
Not sure what you were after with R-Value, but Greg is asking about direct air leakage....
What's the ratio of heat loss from Greg's house via:
the lack of insulation
vs
direct air leakage
?
the lack of insulation
vs
direct air leakage
?
We know that Greg has a 3 story house, with one of the stories being at least partially underground, and from a previous post, the upstairs is unheated, so, I'll interpolate his above ground surface area as being 189 m^2. (1000 ft^2 floor area with 8 ft tall walls)
Using your temperature numbers, I calculate that with the fan on, he would be losing 635 watts.
With a nominal R-value of 13, his walls and ceiling will be losing 1815 watts.
Since we don't know his actual air leakage rate, nor his aggregate R-value, it's difficult for me to recommend a course of action.
Also, since we now know his bathroom fans have "back draft dampers" and he has exterior flaps, I would not recommend adding more flaps.
ps. obligatory graph:
This tells me, that even at 10% of the fans flow rate, it's still losing 1/27th as much energy as the house, itself.
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