next message in archive
next message in thread
previous message in archive
previous message in thread
Index of Subjects
hey were painted black.=C2=A0 I couldn&#39;t It’s reversible, works both ways: an object with a ‘black’ surface will both absorb a wide range of visible and infrared radiation, and if the object is heated, it will emit in a broad range but the emission spectrum depends largely on the temperature reached. For heating, you are more interested in the infrared component of the emitted radiation. How ‘black’ something is (technically, how spectrally flat, and what percentage of radiation is absorbed and not reflected out again) depends on what the paint or other coating is. Traditional sources like candle soot deposited on the bottom of a saucer, and lamp black from oil lamps were very good black absorbers but have been superseded in paints by oil industry products. On May 27, 2020, at 10:11 PM, N Robinson <nrobbyn@gmail.com> wrote: > Re the blacking, when living in Montreal in an old house with hot water furnace and radiators , I wondered at a certain point if the radiators would radiate more heat if they were painted black. I couldn't find anything on the net, probably because I did not know what question to ask. It was just a hunch, because black absorbs more heat; but this heat would be coming from the inside, so to speak...? > > Still don't know but perhaps David's discovery holds the answer. > > I did not paint them black and did not use my chimes to test anything. > > Nancy
next message in archive
next message in thread
previous message in archive
previous message in thread
Index of Subjects