[Greenbuilding] PEX and solar

[Morgan McDonald]

Glazed flat-plate collectors and evacuated tube collectors can reach
very high temperatures; the return pipe coming from the collectors can
contain steam at startup. Pex is probably okay for the feed side..

Cheers,

MM

_______________________________
Morgan McDonald, B.Eng.(Mech)
Design Manager
Taylor Munro Energy Systems, Inc.
11-7157 Honeyman Street, Delta BC (Canada) V4G 1E2
T: 604.946.4433   F: 604.946.3804
mcdonald at taylormunro.com
www.taylormunro.com
 

-----Original Message-----
From: greenbuilding-bounces at listserv.repp.org
[mailto:greenbuilding-bounces at listserv.repp.org] On Behalf Of Vadurro,
Rob, EMNRD
Sent: September 14, 2007 7:26 AM
To: greenbuilding at listserv.repp.org
Subject: [Greenbuilding] PEX and solar

Sacie sez:

 

>I learned to my distress PEX can not be used in solar water systems

because it can't take the heat, distressed because I embedded it in my
walls and to the roof in preparation for just this.  But 

otherwise, what is bad about it?   Sacie 

 

>Uh oh, I did the same rough-in.  If PEX will take 120F for domestic hot
water, why not solar?  Are you expecting more than 120F in a solar hot
water heater?  

 

>A newer vacuum collector might get so hot, the older, less insulated
collectors may not.  Any experiences?  

 

--Lawrence

 

I recently installed a couple of Heliodyne collectors and water systems.
There were two temperature settings for the water coming off the
collectors- the lowest one was 160 degrees F.

 

-Rob Vadurro



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