adiel
Junior Member
Posts: 119
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copper
Feb 28, 2015 21:52:53 GMT -8
Post by adiel on Feb 28, 2015 21:52:53 GMT -8
did anyone tried to use copper as the radiator?
is it expanding much?
is it changing colors?
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copper
Mar 1, 2015 5:24:49 GMT -8
Post by belgiangulch on Mar 1, 2015 5:24:49 GMT -8
Do you mean copper sheet to replace the 55 gal barrel ? Would be expensive to buy sheet copper and soldering a top on it ,but would be very nice looking as it colored with heat. I believe erni & erica used a copper sheet to wrap around a 55 gal steel barrel as a decorative cover ... looked great.
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Post by matthewwalker on Mar 1, 2015 7:49:03 GMT -8
It doesn't emit heat energy very well at all, so you won't feel much heat from it. Highly conductive, very poor emissivity. Look here: en.wikipedia.org/wiki/EmissivityIt's almost as bad as aluminum foil. |
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copper
Mar 1, 2015 8:24:50 GMT -8
Post by shilo on Mar 1, 2015 8:24:50 GMT -8
ERICA
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adiel
Junior Member
Posts: 119
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copper
Mar 1, 2015 11:12:19 GMT -8
Post by adiel on Mar 1, 2015 11:12:19 GMT -8
It doesn't emit heat energy very well at all, so you won't feel much heat from it. Highly conductive, very poor emissivity. Look here: en.wikipedia.org/wiki/EmissivityIt's almost as bad as aluminum foil. thanks!! great link. |
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copper
Mar 2, 2015 9:09:38 GMT -8
Post by Dan (Upstate NY, USA) on Mar 2, 2015 9:09:38 GMT -8
I donno, I use stainless steel barrel and it puts out a lot of heat, low emissivity or not.
Copper would oxidize a fail at the temperature I run my stove at, and if made with solder joint the solder would burn out or melt out quick.
A copper seamed box may work but the thickness you would use to make it last would be expensive as a stainless barrel.
And my stainless barrel is not holding up any better then a plain steel barrel in the areas that it gets red hot.
I would have been better off going to my local welder, for the price I paid for my stainless barrel, and have him weld up some thick plain steel.
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copper
Mar 3, 2015 2:57:57 GMT -8
Post by Vortex on Mar 3, 2015 2:57:57 GMT -8
It doesn't emit heat energy very well at all, so you won't feel much heat from it. Highly conductive, very poor emissivity. Look here: en.wikipedia.org/wiki/EmissivityIt's almost as bad as aluminum foil. If copper is Highly conductive with very poor emissivity, does that make it a good heat store? Copper is well known for it's ability to conduct heat (copper bottomed kettles etc), but if it's so good at absorbing heat what's it then do with it? surely it has to radiate it back out? (Car radiators are made of copper). |
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adiel
Junior Member
Posts: 119
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copper
Mar 3, 2015 10:51:40 GMT -8
Post by adiel on Mar 3, 2015 10:51:40 GMT -8
It doesn't emit heat energy very well at all, so you won't feel much heat from it. Highly conductive, very poor emissivity. Look here: en.wikipedia.org/wiki/EmissivityIt's almost as bad as aluminum foil. If copper is Highly conductive with very poor emissivity, does that make it a good heat store? Copper is well known for it's ability to conduct heat (copper bottomed kettles etc), but if it's so good at absorbing heat what's it then do with it? surely it has to radiate it back out? (Car radiators are made of copper). i also don't really get it but i have a stove with shining stainless chimney and when i check with the infrared thermometer it shows 40 but if i touch it it is 80 at least. what i understood was that the emissivity is low but the conductivity is high. maybe the heat is conducted inside the copper to the next thing it touches but it does not radiates? |
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copper
Mar 6, 2015 14:26:07 GMT -8
Post by pinhead on Mar 6, 2015 14:26:07 GMT -8
Heat can transfer in three ways: Conduction, Convection, and Radiation.
Emissivity is a measurement of the material's ability to radiate heat. Conductivity and Emissivity are two separate measurements.
For instance, aluminum has a higher conductivity than steel, though it has a lower emissivity.
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stoker
Junior Member
Posts: 61
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copper
Mar 8, 2015 16:44:18 GMT -8
Post by stoker on Mar 8, 2015 16:44:18 GMT -8
It doesn't emit heat energy very well at all, so you won't feel much heat from it. Highly conductive, very poor emissivity. Look here: en.wikipedia.org/wiki/EmissivityIt's almost as bad as aluminum foil. Quoting some of the numbers from that Wikipedia page: Aluminium foil 0.03 Aluminium, anodized 0.9 Copper, polished 0.04 Copper, oxidized 0.87 Paint (including white) 0.9 So paint the copper (with as thin a layer of paint as you can, since most paints are not great conductors) and you'll be fine. Or just let it oxidise, which will happen spontaneously anyway, turning it from bright shiny yellow/orange to dull brown. |
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