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Re: Passive solar heating for pool?
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Subject: Re: Passive solar heating for pool?
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From: nick@vu-vlsi.ee.vill.edu (Nick Pine)
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Date: 16 May 1996 11:59:59 -0400
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Article: 781 of alt.solar.thermal
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Keywords: solar heating swimming pool
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Newsgroups: alt.energy.renewable, alt.solar.thermal, sci.energy
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Organization: Villanova University
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References: <DrGsFu.10L@eskimo.com>
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Xref: newz.oit.unc.edu alt.energy.renewable:15243 alt.solar.thermal:781 sci.energy:49511
Shane Peterson <aladd@eskimo.com> wrote:
>I have a friend who is looking for information on passive solar
>heating designs for a kid's swimming pool.
Sounds interesting... Solar pool heating should be very easy,
with low water temps and all that built-in storage...
>Specifics: Pool size is about 3700gal
eg 462 ft^3 of water in a circular pool, 3' deep, 14' diam, 154 ft^2 cover?
> Location is western Washington near Olympia
SP (sun power) Daily air temperature Pool temp
Hmmm. Jan 450 Btu/ft^2/day 38 F average 44 F max 83 F
Feb 640 ( > of vert, 41 F 50 F 94 F
Mar 880 horizontal) 44 F 54 F 105 F
Oct 810 50 F 61 F 131 F
Nov 490 43 F 50 F 92 F
Dec 390 38 F 44 F 77 F
> Cost should be kept low, construction of
> heating panel would be done by the owners.
The main thing is to have a good cover. Suppose it's R10 foil-faced foam,
2" thick, 16 x 16, hinged along the north edge, with a counterweight, and
you have R10 foamboard around the perimeter, and you use an R1 floating
transparent cover and open and close the rigid reflective cover every day
when the sun is shining, except in October...
Air temp Ta and water temp Tw make a daily heat loss Eout of roughly
6 hr (Tw-Ta) 154/R1 cover open
+ 18 hr (Tw-Ta) 154/R10 cover closed
+ 24 hr (Tw-Ta) 132/R10 sides
= (924+277+317)(Tw-Ta) = =1518(Tw-Ta) = 154 SP = Ein ==>
Tw ~= Ta + SP/10 (see table above.)
Nick