All indications are that the visible spectrum contains very little of the energy being radiated so what we see can not be used to figure the radiated power. Many other variables appear to get into the fray which forces us to rely upon calibration if we are to achieve accurate accounting of the radiated and convected power. It is unfortunate that the input power was not the same during both the dummy run and the active one since the increased apparent temperature would have clearly demonstrated excess power if any was present.
I am left with believing that excess power was generated due to the rapid increase in calculated output power when a small increase in input power was applied. This is a characteristic of an ECAT system with positive thermal feedback. A passive system would not display this behavior. Dave -----Original Message----- From: Alan Fletcher <[email protected]> To: vortex-l <[email protected]> Sent: Wed, Oct 29, 2014 11:35 am Subject: Re: [Vo]:MFMP interviews spokesman from WILLIAMSON From: "Eric Walker" <[email protected]> Sent: Tuesday, October 28, 2014 10:20:52 PM On Tue, Oct 28, 2014 at 12:36 PM, Alan Fletcher <[email protected]> wrote: Basically what happens is that as the temperature changes the peak of the blackbody spectrum moves through different parts of the emissivity/wavelength curve. Are you assuming a standard Boltzmann curve that just shifts its peak according to emittance? Is it possible that the frequency and heat-dependant combination of emittance, transmissivity and reflection make it so that there is a distribution other than a Boltzmann distribution for the alumina shell? Eric Yes, that's how Planck's formula/integration works. It TRIES to send a Boltzmann curve, but this is modulated by the emissivity spectrum. As the temperature increases the spectral peak get higher and shifts to shorter wavelengths. If the emissivity is higher then the total power will increase, otherwise (as in this case) it decreases. Per Manara the transmission looks negligible outside the visible range, where there's practically no blackbody power anyway up to 1400C. (It moves to the visible at much higher temperatures -- 4000 to 6000C).
