In doing research today I found the following, not sure where I can buy them at this point.
1. solar dissipation tubes. that will do about 12,000 btu or at least this one does. 2. 3 way thermostatic valve which uses a type of wax that opens and closes it at a specific temp and routes the heat through the dissipation tube vs the heat exchanger down below. jay > On Jun 17, 2025, at 9:50 AM, Jay <jay.pe...@gmail.com> wrote: > > Hi Todd > > The issue I have with evacuated tube at 8000’ is they will get extremely hot > in a short period of time, even in the dead of winter with snow reflection, > so the idea of seasonal covering isn’t so practical as it is in other places > and with flat plate. > > Jay > >> On Jun 17, 2025, at 9:44 AM, Todd Cory via RE-wrenches >> <re-wrenches@lists.re-wrenches.org> wrote: >> >> >> I sized our glycol based SHW system to maximize winter production, so the >> two, 4 X 10 flat plate collectors are at a steep angle, but in the summer, >> when hot water needs are minimal, the system still produces more then is >> needed. >> >> I do have a 5000 BTU hydronic heater to dump excess heat, but this is inside >> the house to facilitate spring and fall excess production space heating, >> which is of course unwanted in the summer. >> >> My suggestion for your client is to do what I do, namely (hire someone to) >> seasonally cover most of her collectors with shade cloth which is the >> easiest solution. >> >> Todd >> >> >> >> >> On Tuesday, June 17, 2025 7:28am, "jay via RE-wrenches" >> <re-wrenches@lists.re-wrenches.org> said: >> >> All of these options would be possible for someone younger and able, but the >> client is early 80’s and she wants it to work correctly without having to do >> the manual cover/uncover which given the collector area, elevation and temps >> etc isn’t an option. >> Which means please let me know of a good resource for solar thermal >> products. >> Specifically I need to convert this to a drain back system. >> I’ll need the drain back tank and new pump station >> thanks >> jay >> >> On Jun 15, 2025, at 8:35 PM, Bradley Bassett via RE-wrenches >> <re-wrenches@lists.re-wrenches.org> wrote: >> When I found that my system was somewhat oversized, I plumbed in a mixing >> valve and a heat dump radiator (a few Cu pipes) in the crawl space to dump >> the heat. It's on the solar supply line and it works like a charm. It >> actually adds a very modest amount of heat to the crawl space, not enough to >> notice. It's going on 20 years without any issues, probably because it's an >> anti-freeze system so no mineral buildup in the mixing valve. I've also >> heard of using a fin radiator under the eve for this instead of the crawl >> space. The crawl space was easier for me. >> Brad Bassett >> >> On Sun, Jun 15, 2025 at 5:02 PM david quattro via RE-wrenches >> <re-wrenches@lists.re-wrenches.org >> <mailto:re-wrenches@lists.re-wrenches.org>> wrote: >>> There must be a variable mixing valve that is informed and controlled by a >>> thermocouple >>> >>> On Sun, Jun 15, 2025 at 4:46 PM Jay via RE-wrenches >>> <re-wrenches@lists.re-wrenches.org >>> <mailto:re-wrenches@lists.re-wrenches.org>> wrote: >>>> Hi all >>>> >>>> I’ve inherited an incorrectly sized solar thermal evacuated tube system. >>>> It’s too many tubes for the use most of the year. >>>> >>>> Does anyone know of a design or product that can remotely cover them? >>>> I can find shade cloth of course that I can cover them but something >>>> remote control would be better >>>> >>>> Thx >>>> Jay >>>> >> >> >> >> Sent from Finest Planet WebMail. >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >>
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