Hot water at summer camp [RE-wrenches]

[Darryl Thayer]

Hello
My understanding is that as CO2 desoloves in water it
becomes acid.  As this acid passes through the
limetone of soil and rock it becomes CaCO3? This makes
hard water.  As the water is heated the CaCO
precipates as the hard water products.  

When I am concerned with overheating and stagnation, I
use a closed water drainback system.  I am concerned
with usnig antifreeze in stagnation systems because
the antifreeze breaks down and becomes acid.  Just
heating water does not.  The closed water drain back
system must be properly drain when the pump shuts
down.  These systems survive here in Minnesota, they
cost as much as antifreeze systems.  

Darryl
--- Ken Schaal <ken at commonwealthsolar.com> wrote:

> 
> Acid neutralizer tanks are on p.2937 of the curent
> Grainger catalog #398. 
> Limestone [ marble chips] raises the ph. As it does
> so, it dissolves and 
> could thus precipitate if conditions are right.The
> rate at which it 
> dissolves is a function of the water ph, and the
> amount of flow. In a hot 
> copper pipe, or collector, it will form a coating
> which is both protective 
> and somewhat inhibiting of conduction.
> Here in the flatlands of the SE, central Va. with
> shallow 50 wells in sandy 
> soil we have a ph about 5.5. Up in the mountains
> with limestone formations, 
> it's less of a problem.
> 
> 
> 
> 
> ----- Original Message ----- 
> From: "Bill Loesch" <solar1online at charter.net>
> To: <RE-wrenches at topica.com>
> Sent: Friday, March 23, 2007 8:00 AM
> Subject: Re: Hot water at summer camp [RE-wrenches]
> 
> 
> >
> > Ken,
> >
> > I have never heard of the marble chips technique
> before. Do I understand
> > that the marble chemically reacts with the acid
> water as well as becomes a
> > precipitate site for hard water scale? If there is
> a chemical reaction, 
> > how
> > long does the marble last?
> >
> > My compliments for thinking outside of the box.
> >
> > Is this marble tank something you home brew or is
> it commercially 
> > available?
> > Details please.
> >
> > Thanks again,
> >
> > Bill Loesch
> > Solar 1 - Saint Louis Solar
> > 314 631 1094
> >
> > ----- Original Message ----- 
> > From: "Ken Schaal" <ken at commonwealthsolar.com>
> > To: <RE-wrenches at topica.com>
> > Sent: Thursday, March 22, 2007 6:32 AM
> > Subject: Re: Hot water at summer camp
> [RE-wrenches]
> >
> >
> >>
> >> A simple solution to copper corrosion due to acid
> water is to install a
> >> neutralizer tank, which uses marble chips to
> raise the ph. Thicker copper
> >> will only delay the problem.
> >> There will be more lime deposits to precipitate
> onto very hot surfaces,
> > like
> >> coffee makers, which can be cleaned with vinegar.
> For boilers, and batch
> >> heaters subject to high temps or stagnation,
> appropriately placed valves
> >> will facilitate cleaning with acid.
> >>
> >> One of the many reasons to use drainback systems,
> especially now that 
> >> very
> >> low wattage pumps with high head are available.
> >>
> >> Ken
> >>
> >>
> >>
> >> ----- Original Message ----- 
> >> From: "Tom Lane" <tom at ecs-solar.com>
> >> To: <RE-wrenches at topica.com>
> >> Sent: Wednesday, March 21, 2007 8:26 AM
> >> Subject: Re: Hot water at summer camp
> [RE-wrenches]
> >>
> >>
> >> >
> >> > Hi All,
> >> > I strongly recommend the SunEarth Copper Heart
> versus the Progressive
> > Tube
> >> > (TCT) PT-40. The TCT PT-40 uses a .030 copper
> sheet that is welded to
> > form
> >> > a tube. We have had lots of problems with this
> leaking in agressive
> > water.
> >> > The Copper Heart  uses extruded .058 DWV copper
> pipe--almost twice as
> >> > thick. I suggest a Rheem or Rudd 80 or 120
> gallon wrap around heat
> >> > exchange tank if the water is agressive(low
> ph., iron oxides, CO2 or 
> >> > O2,
> >> > etc.. with a SunEarth or AET Drainback or
> pressurized glycol system.
> >> > Gator Tom
> >> > 
> 
> 
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> 



 
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