Physics on a sunny day
- From: "Edward Green" <spamspamspam3@xxxxxxxxxxx>
- Date: 16 Jul 2006 10:52:45 -0700
I bought a new patio table with a sun umbrella. I bought a new garden
bench. I sat on the bench under the peach tree in the hot sun, and it
was good -- a mild breeze blew, and it was pleasant. I moved to under
my new sun umbrella, and it was not good -- a radiant heat as from an
oven came off the underside, and it was not pleasant.
The umbrella, it seems, is not a good design. Not as good as the peach
tree, which wasn't even designed for our benefit, so far as we know.
The dark green leaves evidently reflect a large portion of the sun's
radiation, so the tree as a whole does not heat up significantly beyond
ambient temperture, though exposed to non-equilibrium radiation. Or is
the tree actively cooling itself by evaporation? Whatever it is the
tree is doing, the umbrella is not. The umbrella, though apparently
lighter in color than the tree, is absorbing light and reradiating it
in the IR.
Moral: the works of man suck. Shady trees rule.
.
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