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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Derek wrote: Most cars tend to have black radiators, condesors etc. but I've noticed some oil coolers and sleeve type air units use silver (aluminum). Is this just a styling issue with cars and refridgerators etc., or is one colour better for radiators? Similarly, all the evaporators I recall seeing, have all been in their raw metal colour. Does it make much difference at the end of the day? Thanks. I've got a really old book on steam heating and plumbing that had a write-up on the effects of color on radiators. Turns out radiators painted black or a dark color were slightly more efficient than unpainted or light-colored ones. The difference was very slight in those tests and at the temperatures they were using. Probably added manufacturing cost has something to do with it, coupled with the very slight efficiency boost that can be had from black vs. as-is. On the wrecks I've robbed,radiators were uniformly black, A/C components were in the white. Might just be tradition on the radiators' color. Stan |
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O.T. Heat Exchangers ..... Silver or Black?
Most cars tend to have black radiators, condesors etc. but I've
noticed some oil coolers and sleeve type air units use silver (aluminum). Is this just a styling issue with cars and refridgerators etc., or is one colour better for radiators? Similarly, all the evaporators I recall seeing, have all been in their raw metal colour. Does it make much difference at the end of the day? Thanks. |
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wrote in message ps.com... Derek wrote: Most cars tend to have black radiators, condesors etc. but I've noticed some oil coolers and sleeve type air units use silver (aluminum). Is this just a styling issue with cars and refridgerators etc., or is one colour better for radiators? Similarly, all the evaporators I recall seeing, have all been in their raw metal colour. Does it make much difference at the end of the day? Thanks. I've got a really old book on steam heating and plumbing that had a write-up on the effects of color on radiators. Turns out radiators painted black or a dark color were slightly more efficient than unpainted or light-colored ones. The difference was very slight in those tests and at the temperatures they were using. Probably added manufacturing cost has something to do with it, coupled with the very slight efficiency boost that can be had from black vs. as-is. On the wrecks I've robbed,radiators were uniformly black, A/C components were in the white. Might just be tradition on the radiators' color. Stan Early radiators were brass and copper. The black paint was on them to help control corrosion and hide the radiator from view from the front of the auto (hiding all the solder joints was also a big thing). Many newer vehicles have bare aluminum BUT on many of them you cannot see the radiator from in front of the vehicle anyway since many are now pulling the air from the area below the front bumper. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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also, you need to look at the reflectivity/absorbtivity of the material in
the proper bands - visible is not where most of the radiated energy goes with a radiator, it's in the low part of the IR band. Also, most cooling is by convection, not radiation, so removing the paint offers a lower thermal resistance to the air "Steve W." wrote in message ... wrote in message ps.com... Derek wrote: Most cars tend to have black radiators, condesors etc. but I've noticed some oil coolers and sleeve type air units use silver (aluminum). Is this just a styling issue with cars and refridgerators etc., or is one colour better for radiators? Similarly, all the evaporators I recall seeing, have all been in their raw metal colour. Does it make much difference at the end of the day? Thanks. I've got a really old book on steam heating and plumbing that had a write-up on the effects of color on radiators. Turns out radiators painted black or a dark color were slightly more efficient than unpainted or light-colored ones. The difference was very slight in those tests and at the temperatures they were using. Probably added manufacturing cost has something to do with it, coupled with the very slight efficiency boost that can be had from black vs. as-is. On the wrecks I've robbed,radiators were uniformly black, A/C components were in the white. Might just be tradition on the radiators' color. Stan Early radiators were brass and copper. The black paint was on them to help control corrosion and hide the radiator from view from the front of the auto (hiding all the solder joints was also a big thing). Many newer vehicles have bare aluminum BUT on many of them you cannot see the radiator from in front of the vehicle anyway since many are now pulling the air from the area below the front bumper. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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