Date: Fri, 12 Jun 2015 12:28:14 -0700
Reply-To: PB <pbrattan@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: PB <pbrattan@GMAIL.COM>
Subject: Re: how to cool a poptop?
In-Reply-To: <CAEwp_cROGd-Y-nLuZqDsCxikvZzGwpza5bZyOSm1JTCxvC=wHA@mail.gmail.com>
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Marc, where are you located? As for tinting, my 2002 Jeep Liberty is the
only vehicle I ever had with tinted windows, and was pleasantly surprised
at how much it lowered the temperature inside, even while parked in the hot
sun (windows always cracked open.) I ALWAYS seek shaded parking, but
sometimes it's just not available.
The tint guy where I got an estimate also tinted the brand new 1990 Westy
belonging to another member of this list 25 years ago! At that time, he
removed the back window to tint it. Somebody else in his shop removed the
2 sliders to tint them. He told me it would no longer be necessary to
remove the cabinet side window, as he had new and better tools to do the
job, but still wanted to remove the sliders, if possible. What I needed to
look up about the slider (glass part only) was that there is something -
maybe fuzz around it that is no longer available to buy a replacement. A
youtube video shows a guy removing the glass from the slider with only
basic everyday tools, and it looks fairly simple, but I don't know if it's
as simple to put it back.
Patti
On Fri, Jun 12, 2015 at 10:18 AM, Marc Perdue <mcperdue@gmail.com> wrote:
> Alistair,
>
> The surface of a dark poptop will be hotter. A darker surface can't
> conduct the heat absorbed by the dark surface fast enough so it
> reradiates it back to the exterior and feels hotter on the surface.
> How much of the heat gets through to the interior depends on the
> conductivity of the fiberglass. This strikes me as odd too, and I
> didn't get it till I attended a solar engineering conference years
> ago. A presentation by the masonry institute showed that lighter
> colors for mass storage walls were more efficient because their
> ability to conduct the heat collected on the surface to the interior
> of the mass was better matched to the ability of their surface to
> absorb incoming solar radiation, or insolation. What they also found
> was that amount of mass wasn't as important as the surface area
> exposed to the incoming solar radiation. What that means to us is park
> in the shade.
>
> As others have noted, your windows are the bigger problem. Their high
> transmissivity allows much of the insolation to pass through, where it
> gets converted to heat, which doesn't pass back out of the window as
> easily. If you further insulate the inside of your van without
> reducing the insolation, you're basically creating a passive solar
> collector or oven.
>
>
> Patti,
>
> I had my van tinted after camping at my first festival shortly after I
> bought it. It is significantly cooler now, though I don't have actual
> measurements to back that statement up. The guys that did my van were
> able to do the window behind the linen closet without taking the
> window out. Same with the sliders, though one of them is peeling back
> some from the seal at the leading edge of the window. I should take it
> back to them; they gave me a lifetime warranty on their work.
>
> Marc Perdue
>
> On Fri, Jun 12, 2015 at 10:41 AM, Dan N <dn92610@gmail.com> wrote:
> > the Easy-Up canopy is way to go... but quite heavy... about the same
> weight
> > as full size awning
> >
> > On Fri, Jun 12, 2015 at 7:13 AM, Steve Williams <sbw@sbw.org> wrote:
> >
> >> I'm told at Burning Man folks rely on shade structures over their vans
> >> and other dwellings. Not feasible for parking at work, maybe, but if
> >> planning to camp where no shade is available, it might be worth carrying
> >> a collapsible shade structure.
> >>
>
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