|
|
re: "sixty feet under"
8 dec 2005
travis jordan wrote:
>> > > "what happens is through cooking and the opening and closing of
>> > > windows, the interior adjusts to a temperature that is comfortable
>> > > to you,"
>> >
>> > why not, with enough insulation? the deep ground temp in seattle is
>> > 52 f
>>
>> because they aren't building in seattle, they are building in clinton,
>> ma, where the frost line is probably about 20" or so.
so, the washington times is not from wa, but ma, where the deep ground temp
in worcester is 46.7 f, so a 2300 ft^2 house with 6000 ft^2 of surface could
stay 70 f if 3800btu/h = (70f-46.7f)6000ft^2/rv, with r37 walls.
the yearly average sun on the ground is 1220 btu/ft^2 per day, it could stay
70 f with no indoor electrical usage with a ft^2 of r2 skylights with 80%
solar transmission if 24h(70-46.7)((6000-a)/rv+a/2) = 0.8x1220a, ie
a = 6000/(1+1.24rv) = 232 ft^2 with r20 walls or 118 ft^2 with r40 walls.
>and they'll need a dehumidifier most of the year which will cost more
>than $150 to run just by itself.
it shouldn't need any dehumidification, if it's fairly airtight.
the worst-case month is july, with w = 0.0112.
nick
|
|
