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

[Troy Harvey]

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