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R-values of reflective insulation materials

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R-values of reflective insulation materials nicksanspam 04-28-2008
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Posted by on April 29, 2008, 7:34 pm

>Thanks for that Nick I will google somewhere to download it from.
>Was going to use 3 reflective air spaced layers behind a trickle
>solar panel array system.

Under what kind of glazing? Warm water vapor quickly degrades polycarbonate.

Multiple relfective airspaces require iteration to determine intermediate
surface temps, as described in ASTM STP 1116. Adding individual airspace
resistances does not work.

Nick


Posted by Solar Mike on April 30, 2008, 7:54 am

nicksanspam@ece.villanova.edu wrote
> Under what kind of glazing? Warm water vapor quickly degrades
> polycarbonate.
Yes I know, talking to people in the local plastic shop it aborbs water
vapour over time and goes brittle. I wanted them to heat bend some sheets of
it with folded right angle edges; cannot readily be done because of this.

Trickle panels are:
3m high x 1m width galv iron sheets, matt black powder coated on the sun
side, water channels made by vertically running silicon beading spaced every
5cm down the metal sheet, laying 75u clear mylar on top of the silicon,
lightly pressing before it sets to form a vapour shield. The water runs
between the metal and the mylar. Each panel then sits in a wood frame with
an overall cover of 1mm flat clear thick polycarbonate with uv protection.

Time will tell how long the mylar will last. The poly glazing will block the
uv entering the box and hopefully stop the plastic header/bottom water pipes
from falling to bits..

Was going to run multiple air spaced layers of foil faced building
insulation paper (the stuff without bitumen) behind the metal panels finally
the wooden ply bottom. Figured some water vapour will escape into the box ,
so there will be vent holes.


> Multiple relfective airspaces require iteration to determine intermediate
> surface temps, as described in ASTM STP 1116. Adding individual airspace
> resistances does not work.

May make a small test panel and do some measurements with foil then non
water absorbent insulation material.


Cheers
Mike (NZ)



Posted by Mike on May 1, 2008, 6:12 am
On 29 Apr 2008 09:49:46 -0400, nicksanspam@ece.villanova.edu wrote:

>It's not easy to estimate the US R-value of a reflective insulation system.
>It varies from about 1 to 10

....and most of the time it can be completely ignored (assuming you
are not working on an off the planet application)


--

Posted by Morris Dovey on April 29, 2008, 4:04 pm
Solar Mike wrote:

> What version of basic is this, looks like GWBasic or TurboBasic, something I
> last used about 15 - 20 years ago. Can you still get it. Have been running
> VB.Net last 8 years, and VB6 before that.
> If someone could point me in the direction of where to get a suitable
> windows version to run this, would be cool to try running the code.
>
> Cheers
> Mike (NZ)

Try <http://www.geocities.com/KindlyRat/GWBASIC.html>. I think that's
where I got my copy a while back.

I think you'll need to run it in a DOS or CMD window (depending on which
version of Windows you're running).

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/

Posted by Solar Mike on April 30, 2008, 4:27 pm

"Morris Dovey" wrote in message

> Try <http://www.geocities.com/KindlyRat/GWBASIC.html>. I think that's
> where I got my copy a while back.
>
> I think you'll need to run it in a DOS or CMD window (depending on which
> version of Windows you're running).
>

Thanks have just gone and downloaded it from the above link.

Cheers
Mike



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