[DeTomaso] Difference between an aluminum radiator and one that is black

[Ken Green]

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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