I will beg to differ on the space heating properties. domestic hot
water can use any degree above about 50 degF here in wisconsin. every
btu reduces the load on the backup water heater. pool heating is just
fine with anything above 80 degrees or so (pool temps 80-85 deg) and
space heating is the tricky one because it needs temps minimum of 60 deg
above ambient. say 80 deg on a 20 deg winter day for infloor heating,
much higher for fan coils and other convective devices.
There's someone here in the upper midwest peddling something similar to
the amercian solar air to water heater, and that's fine, but what
happens when something fails and the HX freezes. I've heard too many
stories about the HX's freezing overnight and thawing when the sun comes
out, presto, impromptu indoor pool. not on my watch cap'n.
what worries me is that dawn solar is peddling their collector to a
potential customer as a space heating option. he wants us to install
it, and I'm willing to do it, but ONLY with a huge signed neon rotating,
I TOLD YOU SO!!!.
karl out.
mick abraham wrote:
Thanks, Kurt & Ian~
The Dawn Solar arrangement makes me think of a similar looking setup from
American Solar: http://americansolar.com/product-solar-roof.htm
The American Solar setup heats air which they claim can then heat water. Hmm.
My inner geek suspects that both of these systems would yield only low
temperature rise...which would be OK for pool heating or even for space
heating...but for DHW? Hmm. Both of these systems remind me of unglazed
swimming pool collectors.
Glass is old school, low tech, breakable, and there's that nagging low R-value
problem. Even so, glass really has some marvelous properties. The "greenhouse
effect" makes glass behave similar to a selective surface.
Ian's note about the Velux integrated collectors is also appreciated. There
are some excellent how to videos on the Velux website which may be of interest
to other List members.
Anyone in the SW Rockies who might be interested in pooling an order for Velux
gear in order to save freight costs may contact me off list.
Thanks again,
Mick Abraham, Proprietor
www.abrahamsolar.com
Voice: 970-731-4675
---------- Original Message -----------
From: Kurt Albershardt <i...@es-ee.com>
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
Sent: Sat, 27 Dec 2008 09:36:27 -0800
Subject: Re: [RE-wrenches] Building integrated thermal collectors?
--On Saturday, December 27, 2008 8:08 AM -0700 mick abraham
<m...@abrahamsolar.com> wrote:
I'm looking for thermal collectors which integrate into the roof of the
building. These would heat glycol to modest temperatures, for domestic hot
water.
Dawn Solar uses a design which effectively puts radiant floor tubing
just below the metal roof panels. They were not particularly
forthcoming when I asked for more info.
I suspect you could use Rehau Raupanel in a similar fashion.
<http://dawnsolar.com/gallery/TherDSS-StandingSeamClip.JPG>
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--
Karl Schwingel
NABCEP Certified Solar Thermal Installer
NorthWind Renewable Energy LLC
PO Box 723 Stevens Point, WI 54481
k...@northwindre.com
Cell: 715 209 0446
Fax : 715 952 4501
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