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RE: [T3] Squareback car cover


On 8 Nov 2005 at 7:37, Kevin Guarnotta wrote:

> As for the greenhouse effect-my car cover is a light grey, which should
> reflect some light away. Without the cover, you really have a greenhouse,
> and the interior would actually get hotter, right?

Even light grey can absorb a lot of heat, but I agree that a closed car is also 
a pretty good greenhouse. I would expect the weave of any kind of fabric to 
actually trap quite a bit of the incoming light energy; just think of how much 
a mirror reflects, and then recall that the difference between a good mirror 
and the grey fabric is all absorbed by the fabric. Plus we have to consider 
that our eyes really can't tell us what the grey is doing with the infrared, 
where much of the energy is.

I tend to just leave my windows open a crack all the time, and on hot sunny 
days I would try to leave them open an inch, just to promote airflow and avoid 
this problem. This doesn't help much under a cover.

-- 
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054
USA

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