[Greenbuilding] new solar heating system in this country

[Nick Pyner]

I think it's a bit more than that. The mass of fluid, little as it is, may
get so cold under night-sky radiation that it freezes and wrecks the
collector.

Draining back into 1000 gallons doesn't seem such a good idea, hardly worth
the effort, and neither fish nor fowl.

But if it was viable, I guess swimming pool treatment would suffice. Maybe
that's what clorox is.


Nick Pyner

Dee Why   NSW

  -----Original Message-----
  From: greenbuilding-bounces at lists.bioenergylists.org
[mailto:greenbuilding-bounces at lists.bioenergylists.org]On Behalf Of Clarke
Olsen
  Sent: Thursday, 15 March 2012 12:16 PM
  To: Green Building
  Subject: Re: [Greenbuilding] new solar heating system in this country


     The reason to use a drain-back system is to not have the mass of fluid
in the collector get so cold overnight.
  The collector will, of course, be ice-cherry-cold, but it should warm-up
faster when empty. I am setting up a
  system where I intend to drain-back into a 1,000 gal tank, skipping the
heat exchanger.
  The concrete tank is enclosed in 10"+ of foam, in the hope of year-round
storage.
     Question: What could I use to suppress possible organisms from growing
in that hot, dark soup? Vinegar? Clorox?
  The water will remain in that unpressurized system: domestic heat & water
will be through heat exchangers in the tank.


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