[TowerTalk] polyrod

[Keith Dutson]

One could think of an object here on Earth as an antenna receiving energy
from the sun.  Since the sun is transmitting about 4 × 10**26 watts, it is
not difficult to understand why that Al plate got so hot.

The reason a white object does not get as hot as a dark one is simply that
it reflects a large portion of light energy instead of absorbing it.  Also,
an object with more mass stores more energy.  Translated into desired
properties of fiberglass used as guy lines: white, thin rod with high
temperature resistance.

73, Keith NM5G

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Roger K8RI on Tower
Sent: Monday, May 02, 2005 10:35 PM
To: Tom Rauch; k3mm at comcast.net; towertalk at contesting.com
Subject: Re: [TowerTalk] polyrod

Just as a point of interest on color and heat.



In a glass covered solar heater using Forest Green as the color on the
heating element, if the water flow stops, I believe the resting temperature
of the element will be around 340 to 380 F.



I've seen bare aluminum plate 4' X 8' X 1" think (that's heavy!) that had
been left laying on the pavement in front of the shop where I used to work
get so hot that a cup of water thrown on it would hiss as it turned into
steam.  It was like throwing water onto a hot frying pan.



Roger Halstead (K8RI and ARRL 40 year Life Member) N833R - World's oldest
Debonair CD-2 www.rogerhalstead.com


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