Gray Flex - Radiational Cooling [RE-wrenches]

[Lynne A Carter]

If some manufacture out there could make us some good flex conduit.  For the
ratings needed for PV, Then this issue could be solved.  Chris and I would
like to see a breathable, fireproof, Hemp Product that could be the
alternative to the Grey Flex stuff.
It could even have a name printed on the side like BP or Shell. (don't have
stock in homedopot so for get them.)
So if your out there get this product on the market.

Lyn at solarvillage.com
Solar Village Institute inc.
PO Box 14
Saxapahaw, NC  27340
Tel. 336-376-9530
Fax. 336-376-1809
www.solarvillage.com

----- Original Message -----
From: Rob Wills <RWills at AdvancedEnergy.com>
To: <RE-wrenches at topica.com>
Sent: Friday, April 27, 2001 8:12 AM
Subject: RE: Gray Flex - Radiational Cooling [RE-wrenches]


> Jay said "and will fill with water ( I
> punch a small hole in the bottom of the loops as a drain hole when
possible)
> over time"
>
> Many people do not know that a common mechanism for water in conduits and
> junction boxes on
> PV modules is to do with the optical behavior of the cells - being good
> solar absorbers,
> they also have very good emissivity, which means on a clear night they
will
> cool to below ambient.
>
> If they cool to below dew point, moisture will condense on the backs of
the
> modules, and especially
> in junction boxes. It's something to think of when designing wiring
systems
> (and equipment that mounts
> to PV modules and frames).  The drain holes are important as hermetic
> sealing is not possible.
>
> Rob Wills
>
>
>
> -----Original Message-----
> From: jay peltz [mailto:jay at asis.com]
> Sent: Thursday, April 26, 2001 10:29 AM
> To: RE-wrenches at topica.com
> Subject: Re: Gray Flex [RE-wrenches]
>
>
> Hi Bill,
>
> Well actually I am implying that the code doesn't always make sense, but
> that
> isn't anything new in life or in book of code that's hundreds of pages
long.
> And as you know you can ask 4 people and get 5 answers about the safety of
> almost any issue.
>
> But  there will always be different points of view that have good data to
> back
> them up as well. The guys in charge have to listen to the points of view,
> then
> decide what they think is best and act on it. What they decide is what we
> are to
> do.
>
>
> What I was trying to point out only was the seeming inconsistency of some
> things, such as flex conduit use for PV vs say Air Conditioning installs.
> Yes I
> know that conduit is only a physical protector, and will fill with water
 I
> punch a small hole in the bottom of the loops as a drain hole when
possible)
> over time.
>
> I  accept your data but I would like to know if you have measured the
> temperature of a black rooftop AC install?  how does this compare with a
PV
> system?
>
> QUESTION:
> As the flex is rated for a given temperature, then give the geographical
> range
> of the country, is it possible to use different rated flex in different
> parts
> just like we derate for geographical temps?  For example up here on the
> northcoast, in Arcata the hi temperature for the year might be 80 degrees
F,
> where as in Sac its probably like 110 or so?
>
> I am trying to do the best work possible and to do that I need the most
> information possible.
>
> Thanks Bill I really do appreciate it,
>
> Sincerely,
>
> jay
>
> Peltz Power
>
> - - - -
> To send a message: RE-wrenches at topica.com
>
> Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
>
> List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
>
> Check out participant bios: www.mrsharkey.com/wrenches/index.html
>
> Hosted by Home Power magazine
>
> Moderator: michael.welch at homepower.com
>
>
>
> - - - -
> To send a message: RE-wrenches at topica.com
>
> Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
>
> List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
>
> Check out participant bios: www.mrsharkey.com/wrenches/index.html
>
> Hosted by Home Power magazine
>
> Moderator: michael.welch at homepower.com
>

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://www.topica.com/lists/RE-wrenches/

List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm

Check out participant bios: www.mrsharkey.com/wrenches/index.html

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com

==^================================================================
EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9
Or send an email To: RE-wrenches-unsubscribe at topica.com
This email was sent to: michael.welch at homepower.com

T O P I C A  -- Learn More. Surf Less.
Newsletters, Tips and Discussions on Topics You Choose.
http://www.topica.com/partner/tag01
==^================================================================