[RE-wrenches] Solar Combi-systems: Heat dump or Stagnate?

[Tump]

Review Schuco panels they use a anti freeze that separates out during hi
temp stagnation we refer to it as "steam back", glycol separates from the
water, water turns to steam creates pressure that moves the glycol out of
the collectors. They say because of this design their anti freeze also has a
cycle life of 10 years. The only draw back is if you have the pump shut off
due to hi temp the controller will not restart until the next day.
Use it in my home & I like the product. 

    Tump at swnl.net        www.SWNL.net
           Solarwinds Northernlights   
   Serving Mid Coast Maine & Northern California
     Me.# 207-832-7574  Cl.#  610-517-8401
 
                          Blair "TUMP" May
      ********  MAINE'S CHARTER ********
            NABCEP    "Certified PV Installer" 
   
      ********  MAINE'S CHARTER ********
   Trace Xantrex "Certified" Dealer / Installer"
   
  


-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Troy Harvey
Sent: Thursday, April 23, 2009 12:43 PM
To: RE-wrenches
Subject: [RE-wrenches] Solar Combi-systems: Heat dump or Stagnate?


I'm wondering how many of you out there have installed medium sized  
solar hot water systems (6-8 panel) that were designed to stagnate  
during summertime over production as opposed to diverting to a heat  
dump or radiator? The International solar agency has a couple of  
papers that show a properly designed system should be able to stagnate  
in a way that the boiling glycol mix vapors in the panels, purge the  
panels of fluid, turning off the system without degrading the glycol.

That doesn't seem to be a typical way to design systems in the U.S. ,  
we've usually gone to a heat dump. Does anyone have experience with  
this?


Troy Harvey
---------------------
Heliocentric
801-453-9434
taharvey at heliocentric.org


_______________________________________________
List sponsored by Home Power magazine

List Address: RE-wrenches at lists.re-wrenches.org

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