[RE-wrenches] Oversizing Solar Hot Water Storage?

[Carl Adams]

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 <august at luminalt.com> 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
>
> august at luminalt.com
>
>
>
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