Solar Thermal storage [RE-wrenches]

[Conrad Geyser]

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Geoff,
    I think that the industry standard would be option "D" as you do get
your lower panel temperatures/higher efficiency.  By the same token,
directly circulating the same water through the radiant floor eliminates the
HX temp. differential agian.  It would be complicated to try to figure out
what % you'd loose with the HX(s) but it would certainly be measurable.  One
issue is that you'll  need to add another tank.  The usual approach would be
for a unpressurized collapsible tank and to run your radiant floor loops
under vacuum.  I kinda like pressurized/sealed the whole way so oxygen can't
continue to enter the system.  Adding a big (rigid) pressuized tank to an
existing structure is challenging but if you can check out this site for
used tanks:
http://www.aaronequipment.com/inventory.asp?categoryID=75&subcategoryID=8

have fun,

Conrad Geyser
Cotuit Solar

----- Original Message ----- 
From: "Geoff Greenfield" <Geoff at Third-Sun.Com>
To: <RE-wrenches at topica.com>
Sent: Tuesday, May 10, 2005 5:33 PM
Subject: Solar Thermal storage [RE-wrenches]


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>
> I have a not so typical project, and I would really appreciate some input:
>
> The customer has a (really complicated) Tarm wood gassifier with an 800
> gallon atmospheric tank.  The Tarm has it's own treated water loop through
a
> double (parallel) immersed coil heat exchanger.  Also - there is a HE for
> DHW pre-heat (actually it is valved to bypass the HW tank and brought down
> with a mixing valve) and another HE for a closed radiant floor system. All
> of these HE are 55 gallon drum sized coils of soft 3/4 copper pipe - I
think
> about 90' per coil.
>
> So - all is well and the customer has a budget for (5) 48 SF flat plate
> collectors - My question is about how to tie in?  I want to avoid opening
> this tank - I am thinking of an external (flat plate) heat exchanger and
the
> appropriate check valves and pumps to make use of one of the existing
coils
> (Radiant) to store heat (and when radiant system is calling for heat to
use
> it directly).  The extra pump and HE are negatives, as is the "double"
heat
> exchanger loss.
>
> Option B is to open the tank and use an HE with the storage water
directly.
>
> Option C is to charge the radiant system with glycol and integrate it with
> the collectors.
>
> Option D is to do an open drain back with the actual stored water running
in
> the collectors (risking a freeze should a control fail).
>
> Option E is your better idea...
>
> For a brighter energy future,
>
> Geoff Greenfield
> NABCEP Certified Energy Practitioner
>
> THIRD SUN SOLAR & WIND POWER Ltd.
> 340 West State Street
> Athens, OH 45701
>
> www.third-sun.com
> (740) 597-3111
>
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