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Re: good bad or in different

To: <>
Subject: Re: good bad or in different
From: <>
Date: Fri, 20 Jan 2006 09:12:56 +0100
Hi Rob,

You're right.
With an uncoated copper radiator you are loosing a lot of the radiation part.
The radiator has two components how he gets rid of heat:
1. Convection with the air
2. Radiation
At a car radiator the convection part is the most important one but the
radiation is important too.

A metallic copper surface has a radiation transfer of 0,15.
A black coated copper surface can transfer 0,98.
That's the reason why all the engines are black coated.

In this connection I use this type of transfer with radiation heating
plants for energy efficient houses. This type of heating reduces the
enegy consumption a lot and avoid the build up of mould fungus.  If
the shiny copper tubes are directly coated with roughcast the heat
transfer through radiation is about 0,92-0,95.

Hope this helps

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