Re: Storing the summer heat
From: The Ghost In The Machine (ewill_at_sirius.athghost7038suus.net)
Date: 11/23/04
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Date: Tue, 23 Nov 2004 06:01:11 GMT
In sci.physics, Michael Moroney
<moroney@world.std.spaamtrap.com>
wrote
on Mon, 22 Nov 2004 17:22:40 +0000 (UTC)
<cnt790$e0e$1@pcls4.std.com>:
> The Ghost In The Machine <ewill@sirius.athghost7038suus.net> writes:
>
>>In sci.physics, habshi
>><habshi@anony.com>
>> wrote
>>on Sun, 21 Nov 2004 01:42:03 GMT
>><419ff198.1014588@news.clara.net>:
>>> What is wrong with the idea of storing summer heat
>>> underground?
>
>>So let's assume SimplePlanet has 180 days hot weather (30 C),
>>and 180 days freezing cold weather (-10C). Dig an underground
>>thermos vault 10m x 10m x 10m and fill it with 1,000 metric tonnes
>>of 30C water. Total usable heat storage capacity would be 10^10 cal
>>or 41.80 teraJoules, since we want 20 degrees C water at least
>>to come out.
>
>>The walls here would be 600 m^2 total. This means K for this vessel
>>would be on the order of 10^-5 * 10000 / 10^9 = 10^-10, and
>>assuming the Simpletons didn't touch this nice heat vesicle,
>>the temperature of the water just before summer starts again
>>would be
>
>>-10 + 40 * exp(-180 * 86400 * 10^-10) = 29.938
>
> Out of curiosity, what would the necessary R value be for the theoretical
> insulation needed to insulate this heat storage unit?
An interesting question, considering I've forgotten the constant. :-P
(though I think it was 0.17, but I've forgotten the precise units
as well).
However, if we want to keep half the heat (20.90 teraJoules) for
180 days, the total leakage through the walls would have to be at
most 1.344 megawatts, or 2239 W/m^2.
There's also the problem that the delta temp is not constant.
I was thinking of a gigantic thermos bottle, admittedly.
There are a lot of issues structurally, of course.
-- #191, ewill3@earthlink.net It's still legal to go .sigless.
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