Date: Mon, 8 Aug 2005 09:50:29 -0700
Reply-To: TJ Hannink <tjhannink@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: TJ Hannink <tjhannink@YAHOO.COM>
Subject: Re: Painting Poptop White and Heat Transfer
In-Reply-To: <D02E0A54ACB6C24498F1589797EE2AAF018042DA@msex01>
Content-Type: text/plain; charset=iso-8859-1
Back when I had an indoor/outdoor thermometer in my Camper, I did some experiments leaving the roof vents and window vents open while parked in direct sunlight on asphalt. My Camper already has a white pop-top and tinted glass. I found that after 1 hour in the Florida afternoon sun, the interior temperature would be around 135F while the exterior temperature would be around 95F no matter if I left windows/vents open or closed. Since it usually rains here in the afternoon, I was better off leaving everything closed so the van's interior would be dry when I got out of work.
If I left my pop-top up, the awning out and the sliding door open, the interior would also stay around the ambient temperature, but I couldn't park the Camper that way everyday. Eventually my office moved and I had parking inside a garage which kept the interior cooler than the outside air. I have since moved again and am having to deal with the 135F interior temperatures again and the long amount of time it takes for the A/C to cool the whole interior down to a more comfortable 80F.
Good luck,
Tim
"Trenholme, Phil" <Phil_Trenholme@AFFYMETRIX.COM> wrote:
I would be interested in painting my poptop White but I am afraid it
might look funny on my Burgundy Westy. Has anybody done this and have a
picture that they could share? As far as touching a surface to make a
determination of how well a paint is preventing hear transfer, this
seems valid to me. Conductive Heat Transfer calculations look at the
temperature differential.....if the exterior surface temperature is
lowered the differential from the outside temp to the inside temp will
be reduced, the time required for the interior to get hot will be
increased. I like the idea of placing a Space Blanket over the Poptop as
this would preventive heat transfer that occurs as a result of
radiation. I also believe that an exhaust fan at the roof vent connected
to the auxiliary battery would have to help keep the interior
temperature lower....I may have to perform an experiment some weekend
while my Westy sits and bakes in my driveway.
Phil Trenholme
'90 Westy
Santa Cruz, CA
TJ Hannink
Goldibox - 1987 Vanagon Camper, Wolfsburg Edition
1981 Bluebird Wanderlodge, FC-33
Winter Park, Florida
http://home.earthlink.net/~tjhannink/
http://groups.yahoo.com/group/wolfsburg_campers
http://groups.yahoo.com/group/FC_wanderlodge
FAVOR website: http://home.earthlink.net/~clubvanagon
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