Gray Flex - Radiational Cooling [RE-wrenches]

[Joel Davidson]

hemp conduit?

Lynne A Carter wrote:

> 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
> >
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> >
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