On Mon, May 27, 2013 at 3:42 PM, Jed Rothwell <jedrothw...@gmail.com> wrote:
> Jones Beene <jone...@pacbell.net> wrote: > > >> The camera which calculates the temperature of HotCat is based on >> converting radiance into a corresponding temperature – and that camera has >> a setting for blackbody emissivity, which is usually near one at higher >> temperature. **** >> >> ** ** >> >> Levi & the Swedes (sounds like the new ABBA) used the most conservative >> setting – one. >> > > This is clearly shown in Fig. 7, where they adjusted it from 1.0 down to > 0.8 in the IR camera software. The estimated temperature rose from 496 to > 564 deg C. > > We have been over this several times. > > Yes, and still things are left out. The calculated temperature rises, but when you use the same emissivity to calculate the power from the new temperature, the net effect is small. It is positive in that case, but it's not obvious that it's always positive, because the way they choose the effective exponent is not given quantitatively. The paper does not report trying the same thing at lower emissivity like 0.2. And none of this says anything about objects that don't behave like grey bodies. So, in the December experiment, the actual power is very uncertain, and not necessarily conservative. It's sloppy work, plain and simple.
