Gray Flex - Radiational Cooling [RE-wrenches]

Joel Davidson joeldavidson at earthlink.net
Tue May 1 07:06:25 PDT 2001


I knew I shouldn't have touched that joint of pipe.

Jerry Caldwell wrote:

> That's right Joel, there are different plastic-like
> materials of different hardnesses made from hemp.
> Sounds like a very cool futuristic idea.  For now I
> guess we can just call it... a pipe dream.
>
> Jerry
> --- Joel Davidson <joeldavidson at earthlink.net> wrote:
> > 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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> === message truncated ===
>
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