[RE-wrenches] SHW - parallel tanks

Chris Mason cometenergysystems at gmail.com
Tue Sep 24 17:00:30 PDT 2013


Nathan,
I would love to see the schematic of how that works, we run into these
issues occasionally.


On Tue, Sep 24, 2013 at 7:55 PM, Nathan Stumpff <Nathan at arcticsun-llc.com>wrote:

> Kirk,****
>
> ** **
>
> We install this standard on basically all of our two tank systems. Small
> circulator w/ check valve from domestic tank HOT to solar preheat tank
> COLD. The ‘makeup’ water for that line is the one already installed,
> preheat HOT to domestic COLD. It operates on a delta-T control on both
> tanks, so if the preheat tank is warmer than the domestic tank, it moves
> that hot water from preheat to domestic. Benefits are increased solar
> storage (domestic tank becomes usable storage,) cooler preheat tank temps
> (so better collector efficiencies,) and no backup running when there is low
> DHW usage and the domestic tank cools off before the preheat tank.****
>
> ** **
>
> The controls we use (RESOL) have this function preprogrammed, but any
> controller with a spare delta-T relay could be used if you have sensors on
> both tanks.****
>
> ** **
>
> Works like a champ on really simple systems, we have had to monkey around
> and do some multi-tiered controls on systems with several heat sources to
> keep it from running at inappropriate times.****
>
> ** **
>
> I’d be happy to share some drawings off-list if you like.****
>
> ** **
>
> Cheers,****
>
> -Nathan****
>
> ** **
>
> --****
>
> Nathan J. Stumpff****
>
> NABCEP Certified PV Installation Professional #091209-175****
>
> NABCEP Certified Solar Heating Installer #032412-14****
>
> Project Manager | Arctic Sun, LLC****
>
> nathan at arcticsun-llc.com  | (907) 457-1297****
>
> www.reina-llc.com | www.arcticsun-llc.com****
>
> [image: Description: ZA102637861] <http://www.facebook.com/ArcticSunLLC>**
> **
>
> ** **
>
> *From:* re-wrenches-bounces at lists.re-wrenches.org [mailto:
> re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of *Kirk Herander
> *Sent:* Tuesday, September 24, 2013 2:19 PM
> *To:* RE-wrenches
>
> *Subject:* [RE-wrenches] SHW - parallel tanks****
>
> ** **
>
> Hi,****
>
> ** **
>
> Every summer I get a few calls from annoyed hot water customers who can’t
> stand hearing their boiler fire merely to keep the indirect tank up to
> setpoint temperature, when of course the solar preheat tank is at 160
> degrees or better at mid-day. So what’s the best way to transfer heat, in
> essence temporarily putting the tanks in parallel, from the solar tank to
> indirect? I can think of a few possibilities using a circulator and
> temperature controller, and a additional connection between the tanks, such
> as the tank drains plumbed together as a return line, but where is the best
> place to locate the circulator in a standard preheat arrangement (i.e. hot
> output of solar preheat plumbed to cold input of indirect tank)?****
>
> ** **
>
> Kirk Herander****
>
> VT Solar, LLC****
>
> dba Vermont Solar Engineering****
>
> NABCEPTM Certified Inaugural Certificant****
>
> NYSERDA-eligible Installer****
>
> VT RE Incentive Program Partner****
>
> 802.863.1202****
>
> ** **
>
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-- 
Chris Mason
President, Comet Systems Ltd
www.cometenergysystems.com
Cell: 264.235.5670
Skype: netconcepts
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