Solar Thermal storage [RE-wrenches]

Tue May 10 20:37:33 PDT 2005

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Geoff,

We've done some of these Tarm systems up here, and yes, they do get
complex. Need an active owner, or a service contract and great drawings,
to make it work. But work they do, and customers tend to love the
systems.

I'd recommend your first instinct. Interface (through an HE) to the
radiant coil. Gets the heat right where you want it, into the floor, or
secondarily, into the tank. This also allows the collectors to heat the
tank for DHW during the summer, with no change in control.

Jeff Wolfe
Global Resource Options 

-----Original Message-----
From: Geoff Greenfield [mailto:Geoff at Third-Sun.Com] 
Sent: Tuesday, May 10, 2005 5:33 PM
To: RE-wrenches at topica.com
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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