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 <nat...@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**** > > nat...@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-boun...@lists.re-wrenches.org [mailto: > re-wrenches-boun...@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**** > > ** ** > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > -- Chris Mason President, Comet Systems Ltd www.cometenergysystems.com Cell: 264.235.5670 Skype: netconcepts
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