ladelfina
Thinks s/he gets paid by the post
- Joined
- Oct 18, 2005
- Messages
- 2,713
So, I'm remembering having heard somewhere that radiators supposedly work better when painted black. We have big heating bills and the light grey/cream radiators could withstand a touch-up (a matte dark charcoal grey color could be nice)... but "the Google" gives me conflicting stories.
Plenty o' academic types reasoning why it's irrelevant or negligible (because "radiators" heat more by convection than by true radiation) but some practical folks claiming it works.
Anyone have a real-life experience similar to [or different from] this guy?
OTOH MOST people seem convinced that metallic paints reduce the radiators' efficiency. I am hard-pressed to think why that'd be so; the metal used in metallic paint is aluminum, which is the same material as some of our radiators, anyway. So why in this case would people claim it 'reflects' (the heat back into the base metal) rather than conducts (the heat from the base metal to the air)?
Others say metallic is actually better because it goes on in a thinner coat, or because it is more emissive than non-metallic paint. There are also other home-grown theories, such as the bare cast iron having more surface area than painted (paint fills in tiny surface irregularities).
http://www.brownstoner.com/renovations/2005/08/painting_the_ra.html
http://ths.gardenweb.com/forums/load/oldhouse/msg101718273439.html
I failed thermodynamics and don't have a horse in this race.
Lotsa theories; have any of you put it to the test?
Related.. refrigerators more efficient when painted white? (talking about in a home rather than the blazing desert...)
Plenty o' academic types reasoning why it's irrelevant or negligible (because "radiators" heat more by convection than by true radiation) but some practical folks claiming it works.
Anyone have a real-life experience similar to [or different from] this guy?
http://www.naturalhandyman.com/qa/qapaintradiator.htmlI remember making a mistake with radiator color in my first home, which had a similar steam system to yours... a former coal furnace... except it burned fuel oil. There was one bathroom in the house... a very small one on the second floor that had you sitting inches from the radiator... enough said! Anyway, I thought it would be aesthetically pleasing (read "look cool") to paint the radiator black. Well, the BTU output from this tiny radiator was so intense that I ended up repainting it white to make the room useable. After that I selectively repainted radiators black or white based on my heating experience in each room. Since most of the radiators were under covers, the color change was not noticeable, but the temperature difference sure was!
OTOH MOST people seem convinced that metallic paints reduce the radiators' efficiency. I am hard-pressed to think why that'd be so; the metal used in metallic paint is aluminum, which is the same material as some of our radiators, anyway. So why in this case would people claim it 'reflects' (the heat back into the base metal) rather than conducts (the heat from the base metal to the air)?
Others say metallic is actually better because it goes on in a thinner coat, or because it is more emissive than non-metallic paint. There are also other home-grown theories, such as the bare cast iron having more surface area than painted (paint fills in tiny surface irregularities).
http://www.brownstoner.com/renovations/2005/08/painting_the_ra.html
http://ths.gardenweb.com/forums/load/oldhouse/msg101718273439.html
I failed thermodynamics and don't have a horse in this race.
Lotsa theories; have any of you put it to the test?
Related.. refrigerators more efficient when painted white? (talking about in a home rather than the blazing desert...)