[DeTomaso] Difference between an aluminum radiator and one thatis black
Jim Hendrickson
chendric at bellsouth.net
Wed Jun 24 00:30:54 EDT 2009
"I have no idea why they are called radiators."
I guess if you want to be technically correct, you should call it a water to
air heat exchanger.
-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Ken Green
Sent: Wednesday, June 24, 2009 12:16 AM
To: detomaso at realbig.com; mark skwarek
Subject: Re: [DeTomaso] Difference between an aluminum radiator and one
thatis black
Mark,
There are qualitatively different ways heat is transferred, it's been
years, but I'll take a shot at it:
1) conduction, two bodies at different temperature in direct contact, the
heat transfer is proportional to the difference in temperature;
2) convection, hot air rises, so a flow of air, heated by one body, rises
and conducts the heat to a cooler body, you can look up equations, but not
as simple and conduction;
3) radiation, a body radiates heat proportional the absolute temperature to
the 4th power. A body has coefficient that is factored in, and a flat black
body radiates (and absorbs) the best, a mirror the least. But, it has to be
pretty hot for this to matter. I think that our radiators are not that
hot. I have no idea why they are called radiators. I think the cooling is
mostly conduction into the air passing through the radiator.
Please excuse any errors in terms, I had thermo over 30 years ago.
Ken
--- On Tue, 6/23/09, mark skwarek <ehpantera at yahoo.com> wrote:
From: mark skwarek <ehpantera at yahoo.com>
Subject: [DeTomaso] Difference between an aluminum radiator and one that is
black
To: detomaso at realbig.com
Date: Tuesday, June 23, 2009, 5:12 PM
Has anyone studied whether there is a difference between an aluminum
radiator and one that has been blackened. I would think the black one would
reject more heat.
Mark
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