done, not much point in doing more exhaustive calculations without better knowledge of construction and dimensions, but the big guess with regard to wire area doesn't make much if any difference considering nature of black body cavity receiving surface that is inner wall of finned tube. I think the conclusion that the finned wall is only around 1000°C is pretty strong, so I'll be interested to see what if any response or objections are stacked up.
I am hugely excited about the prospects of LENR - and actually stand to do very well commercially from it, but this first-principles evaluation of the Lugano test makes it look like it was another bust with at best very low COP :( A curse upon perpetrators of poor calorimetry! On 13 October 2014 18:46, Marcus Haber <tr...@gmx.de> wrote: > Hello Robert! > > Why dont u go over to > http://www.lenr-forum.com/forum/index.php/Thread/722-Ask-questions-to-the-Working-Group-ECAT-long-term-test/?postID=1386#post1386 > and tell the professors doing the test about ur concerns regarding the > temperature measurement? > But maybe it would be helpful to do some real calculations first. Coming > with crude ones is probably not enough... > > Regards > Marcus > > *Gesendet:* Montag, 13. Oktober 2014 um 07:11 Uhr > *Von:* "Robert Lynn" <robert.gulliver.l...@gmail.com> > *An:* vortex-l@eskimo.com > *Betreff:* [Vo]:E-cat Lugano demo probably had no output. > Appears that there was an inner reactor vessel wrapped with helical > resistance wires (hence shadows) from size of wires and necessary wall > thicknesses this vessel is likely around 12mm diameter. > > Inner wall area of outer finned tube about Ø18mm, 0.2m long .0113m² > > Inconel metal resistance wires can only survive a maximum of about 1350°C > without melting (actually probably lower than that over a month long period) > > From photo 12a/12b the wires appear to be covering less than half of the > core reactor vessel, giving them an area of (estimate) .005m² (this is only > a guess) We know that they dissipate 900W of electricity, and inconel has > emissivity of around 0.7. > > In order for finned tube inner wall to absorb 900W from the wires at > 1350°C they would need to be around 1000°C. At that temperature they would > also transfer approximately 900W to the external environment via radiation > and convection. > > If the inner reactor was any hotter or adding any heat to the system then > it would necessarily increase the finned tube wall temperature to increase > dissipation to environment, that would in turn increase the wire > temperature greatly, including a further bump from the radiative heat > transfer from reactor to resistance wires, increasing their temperature to > far above the point of failure. > > These numbers are only approximate (this is a crude calculation only), but > I think that quantitatively at least it appears that there is a strong > possibility that this demo was producing little if any power, based on > pretty simple physical constraints. And most certainly not the 3.8 COP > claimed. > > As to the explanation for the high temp readings - I suspect the IR camera > was picking up the colour of the resistance wires and inner reactor vessel > body through the partially transparent alumina to give an artificially high > temperature reading. > >
