Date: Thu, 11 Jun 2015 14:29:19 -0700
Reply-To: Bill Gibson <bill.bgibson@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Bill Gibson <bill.bgibson@GMAIL.COM>
Subject: Re: how to cool a poptop?
In-Reply-To: <C71ED7F5-E692-4E53-9186-8B264EFE47A5@shaw.ca>
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There is much less effect from light or dark paint than most people assume.
Black paint will get hotter than white paint, but the mass of the paint is
so small that it does not contribute very much to interior heating, even
though you can touch white painted surfaces more easily than black painted
surfaces. The glass creates a strong greenhouse effect, and that does raise
the inside temps when the windows are closed. Simple ventilation prevents
the greenhouse effect to a large degree, but tinting or reflective
insulation, best outside, not inside glass, is better yet. Think shade, or
space satellite style. Beep Beep.
My stock, no air conditioning 84 Westphalia in southern Arizona has a white
top, and Twinkie yellow cream paint, doesn't have tinted glass, but leaving
windows slightly open and using interior sunshades when parked makes it
possible to touch the steering wheel, etc. this time of year (June). It
just gets dusty.
On Thu, Jun 11, 2015 at 12:55 PM, Alistair Bell <albell@shaw.ca> wrote:
> I can tell you from direct experience that I could not keep my hand on the
> blue (darkish blue) pop top on my friends westy. Whereas the white pop top
> on my van parked beside it was just warm to the touch.
>
> Alistair
>
>
>
> > On Jun 11, 2015, at 11:02 AM, PB <pbrattan@GMAIL.COM> wrote:
> >
> > The "paint guy," where I took my Westy for an estimate, seemed to think
> > that a white poptop would not make a difference during hot weather.
> Where
> > I live it can go up to 110 degrees or more, but there are usually only
> > about 20 or less of these days per year, and usually spread out in August
> > and September. If it's 108 degrees outside, I can't see how a white
> rooftop
> > could reduce the inside temp by more than 2 or 3 degrees, which would
> still
> > result in a sizzling 105 degrees.
> >
> > I'm wondering if there's any feasible or "creative" way to install
> > Reflectix or any other type of insulation *inside* the poptop, or would
> > there happen to be some kind of "paint on" insulation for the exterior...
> >
> > Patti
> > 90 Westy Automatic
> > North Hollywood, CA
> >
> > *♪♫**♥**♫♪♪♫**♥**♫♪♪♫**♥**♫♪♪♫**♥**♫♪*
> > If it's not on my Smart Phone, it doesn't exist...
> > ●▬▬▬▬▬▬ஜ۩۞۩ஜ▬▬♥▬▬▬ஜ۩۞۩ஜ▬▬▬▬▬●
>
--
Bill Gibson
Tempe, Arizona, USA
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