Carl -
Thanks for the input, this is very helpful and along the lines of what I was
expecting. As you eluded to below, there are so many ways to skin the cat with
solar hot water so I'm interested in hearing all sides of the story.
Does anyone out there have experience with oversized tanks lacking Carl's
control scheme?
-August
August Goers
Luminalt Energy Corporation
4000 Irving Street
San Francisco, CA 94122
Office: 415.564.7652
Mobile: 415.559.1525
[email protected]
www.luminalt.com
________________________________
From: Carl Adams <[email protected]>
To: RE-wrenches <[email protected]>
Sent: Saturday, January 31, 2009 5:19:24 AM
Subject: Re: [RE-wrenches] Oversizing Solar Hot Water Storage?
August,
Your assumption about oversizing the storage is correct, too much storage and
the desired usage temperature will not be reached. Along with upsizing the
storage you must change the design and control mechanism to allow priority
loading of multiple storage tanks.
Load tank 1 till your desired usage setpoint is reached then begin loading
storage tank2 (assuming heat is available) , then tank 3 etc. Plumbing the
tanks in series on the DHW side will allow you to draw from the warmest tank in
the string. The Resol BS Plus controller supports such a loading scheme
natively, you might download that controller manual and have a look. I'm sure
this is one of only many possibilities.
With Regards
Carl
On Fri, Jan 30, 2009 at 6:06 PM, August Goers <[email protected]> wrote:
Hi Solar Hot Water Wrenches –
Does anyone have experience or references
to the results of over sizing solar hot water storage tanks? We've been
approached on several instances to add additional storage (beyond the normal 1
to 2 gallons/ft^2 of collector size) to help bump up the solar fraction. I can
imagine that a grossly oversized storage tank could just simply never get very
warm or that the standby losses would be excessively large but I'm
looking for some more specific data and information.
Any info or opinions would help.
Thanks, August
August
Goers
Luminalt Energy Corporation
O: 415.564.7652
M: 415.559.1525
F: 650.244.9167
www.luminalt.com
[email protected]
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