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Re: Solar water heating system value - Page 2

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Posted by Tony Wesley on March 8, 2006, 4:58 pm
 
meow2222@care2.com wrote:

The risk that the system will not work exactly as designed.


Posted by SJC on March 8, 2006, 6:50 pm
 


  These guys show a draindown system as one of their options.
I don't think that they would recommend something unproven.
http://www.thermomax.com/Drain%20Down%20DHW.htm

Posted by meow2222 on March 9, 2006, 12:02 am
 SJC wrote:

Why does he think there is a risk of incompetent engineering in one
system but not another?

NT


Posted by Derek Broughton on March 9, 2006, 1:41 pm
 meow2222@care2.com wrote:


"Those guys" show a system that is reliable as long as that valve opens.
Also, what makes you think they're "recommending something" for northern
climates - they're in Maryland, for heavens sake!

Valves fail.  It's not incompetent engineering.

In a glycol-loop system, even if the pump breaks down there's no risk of
flooding.  Even if it gets cold enough to freeze the glycol (!!) you have
at most a few gallons of it in the loop.  So far, all you've told me about
drain-down systems is that they're safe.  Convince me.
--
derek

Posted by nicksanspam on March 9, 2006, 7:05 pm
 

Aha. I've been thinking drainBACK, as in "the water drains back when the pump
stops, by gravity, with no valve."

Nick


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