Heat Rejection of Alum
Heat Rejection of Alum
(OP)
I am trying to find out if a black anodized piece of die cast alum. will reject heat faster than a plain polished piece. heat cond. won't be a factor here--it's radiation vs convection. I am aware of the importance of the actual temp. for radiation heat loss, but for this case the temp. is only ~125 deg C. What temp. would be necessary for the black anod. piece (I assume there is a slight insulation effect of the anod.) to reject heat faster than the bare one?





RE: Heat Rejection of Alum
nick
RE: Heat Rejection of Alum
RE: Heat Rejection of Alum
RE: Heat Rejection of Alum
This means that the anodic layer is equivalent to 30 mils of aluminum in thermal conductivity. Now it just depends on how thick your thermal path is.
TTFN
RE: Heat Rejection of Alum
RE: Heat Rejection of Alum
The following site explains this in a little detail. In his book he says that it is better not to paint black and the optimum surfaces for those temps is unpainted with Alodine treatment.
http://www.sacskyranch.com/paint.htm