HI everyone I have only done a few of the EVT but I have installed a very many flat plate collectors. Frankly I do not believe I have seen an improvement in performance over flat plate. In fact I would almost be most of my customers are better off with flat plate. I have several monitored flat plate systems, they work as specified, I only have anecdotal information on EVT system performances. I will go for flat plate. Darryl f
--- On Wed, 3/25/09, Dana <[email protected]> wrote: > From: Dana <[email protected]> > Subject: [RE-wrenches] My .02 onEvacuated Tube-based SDHW > To: "'RE-wrenches'" <[email protected]> > Date: Wednesday, March 25, 2009, 10:35 AM > Peter – > > > > I may have been who you spoke with. > > > > Since 1995 I have installed 3 kinds of flat plate SHW > collectors and > THERMOMAX / OVENTROPE, SUNDA and APRICUS evacuated tube > collectors. > > > > Long story shortened on the evacuated tube collectors. > > I have replace 290 of 300 evacuated tubes by manufactured > by Thermomax after > 3-4 years. I had replacements in the first year, I do not > remember the # > replaced. Been there and not going back. > > > > >From the experiences with evacuated tubes the major > short coming is the > intersection of glass to rubber collar to heat pipe. > > I see the single wall glass evacuated tube collectors as a > recipe for > eventual failure. 3 materials 3 different thermal expansion > and contraction > co-efficient. Add “wine glassing” where the bottom of > the single wall glass > vacuum tube falls off [looks like a wine glass without a > base] and I would > not install one if you gave it to me > > > > The first time I saw the APRICUS evacuated tube build I was > sold. The vacuum > is between a tub in a tube, it is glass on glass. The heat > pipe fits inside > the inner tube in a heat collector piece of galv. sheet > metal, and no > rubber collar that is required to maintain a vacuum seal. > I love it. > > > > The glass vacuum tubes are heavier and less prone to an > accidental bang and > break. > > > > If a glass tube gets broken you can replace the glass > vacuum tube separate > from a heat pipe, and if the heat pipe fails you can > replace jut the heat > pie and reuse the tube.. I like components and this is the > great advantage > with APRICUS over the other designs. > > > > 15 year warranty on the manifold and 10 year on the glass > vacuum tube and > heat pipe. > > > > The whole tube is black and absorbs heat 360° so it even > picks up heat on > the back off of a roof or reflected surface behind. > > > > This works for me. I am now an APRICUS dealer for evacuated > tubes and use > several flat plate manufacturers. > > > > > > > > Dana Orzel > > > > Great Solar Works, Inc > > www.solarwork.com > > E - [email protected] > > V - 970.626.5253 > > F - 970.626.4140 > > C - 970.209.4076 > > “I'd put my money on solar energy… I hope we > don't have to wait 'til oil and > coal run out before we tackle that.” > > —Thomas Edison, in conversation with Henry Ford and > Harvey Firestone, March > 1931 > > > > From: [email protected] > [mailto:[email protected]] On > Behalf Of Peter > Parrish > Sent: Wednesday, March 25, 2009 7:41 AM > To: 'RE-wrenches' > Subject: [RE-wrenches] Evacuated Tube-based SDHW > > > > Back at the San Diego Solar 2008 show, I made a point to > look at a number of > evacuated tube systems for SDHW. I got one very strong > recommendation from a > Colorado-based installer I bumped into, and…I promptly > put the information > into “write-only” memory. So here I am six months later > no better off than I > was before I went to the show. > > > > Has there been a recent thread on evacuated tube SDHW > systems? If so, how do > I access the archives? If not could we start a thread? > > > > My principal reason for looking into this technology is for > space-limited > applications. Right now we are looking at trying to find > space on a crowded > roof for about 100-120 sq-ft of conventional flat plate > collectors (e.g. > SunEarth Empire 4’x8’ or 4’x10’), and skylights, > parapet walls and a PV > array are getting in the way. Climate is southern > California coastal. > > > > Any help would be appreciated. > > > > - Peter > > Peter T. Parrish, Ph.D., President > California Solar Engineering, Inc. > 820 Cynthia Ave., Los Angeles, CA 90065 > Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 > CA Lic. 854779, NABCEP Cert. 031806-26 > [email protected] > > _____ > > From: [email protected] > [mailto:[email protected]] On > Behalf Of Peter > Parrish > Sent: Wednesday, March 25, 2009 6:05 AM > To: 'RE-wrenches' > Subject: Re: [RE-wrenches] MPPT greater than 150V > > > > Yes, as far as I know. > > > > Apollo is supposed to have one in beta evaluation but we > haven’t been able > to obtain satisfactory information from them how product > evaluation is > taking place and when the unit will be available as a > product. We had an > application for which we wanted to use this new product and > gave up on them > and their product. > > > > - Peter > > > > Peter T. Parrish, Ph.D., President > California Solar Engineering, Inc. > 820 Cynthia Ave., Los Angeles, CA 90065 > Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 > CA Lic. 854779, NABCEP Cert. 031806-26 > [email protected] > > _____ > > From: [email protected] > [mailto:[email protected]] On > Behalf Of Carl Emerson > Sent: Tuesday, March 24, 2009 5:20 PM > To: 'RE-wrenches' > Subject: [RE-wrenches] MPPT greater than 150V > > > > Hi there, > > > > Can someone confirm that there is still no MPPT regulators > available capable > of accepting array voltages greater than 150. > > > > Thanks, > > > > Carl Emerson > > Free Power Ltd. > > Auckland NZ > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options & 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 _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & 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
