Alan, we have too many crows around here and I will capture some for you if required.
The key thought about the temperature waveform is as follows: Rossi wants to have the largest possible stable COP. You achieve that by allowing the temperature of the heat producing material to reach a value where the internal heat generation is exactly balanced by the heat being extracted to the outside. If you do not keep the temperature slightly below this point then the device will proceed toward thermal failure. The closer you can approach this critical temperature, the longer the temperature will hesitate before beginning its downward path. I have played with a model with this characteristic and find that the COP of 6 is not too difficult to achieve, but trying to obtain more tends to eliminate the margin you need for stable operation. It is also necessary to operate the system in a pulse width modulation mode just as Rossi demonstrates. His waveforms shown in the third party test are entirely consistent. Dave -----Original Message----- From: Alan Fletcher <a...@well.com> To: vortex-l <vortex-l@eskimo.com> Sent: Wed, May 22, 2013 1:47 pm Subject: Re: [Vo]:Levi Hot Cat paper is a gem > From: "James Bowery" <jabow...@gmail.com> > Sent: Wednesday, May 22, 2013 8:41:33 AM > p18 "The electrical power to the dummy was handled by the same > control box, but without the ON/OFF > cycle of the resistor coils. Thus, the power applied to the dummy was > continuous" > > > That would be fine if the dynamics weren't important to the test, but > on p25 we see: > > > "Plot 3. Average surface temperature trend of the E-Cat HT2 over > several minutes of > operation. Note the heating and cooling trends of the device, which > appear to be different from > the exponential characteristics of generic resistor." As I indicated earlier, the exponential RC time constant depends on a SINGLE LINEAR resistor (conductivity*length) and Capacitor (specific heat*volume). First, even if they were linear, it's a complex MESH of RC's (see my Spice analysis of the heat exchanger). Second, the dominant term in heat loss from the surface of the cylinder (ie the resistor) is radiative, varying as T^4 Only the smaller convective component is linear with temperature. Third, we know where the heating resistor is. But we don't know where the Ni/H "thermalization" occurs. In the powder? In the H? In the steel surrounding the powder? I sketched a tentative RC mesh model. It has at LEAST 30 resistors (more than half non-linear) and 10 Capacitors. I'd eat crow/my hat/whatever if the result came out even vaguely exponential. This is a red herring (ie a complete distraction and waste of time) which is irrelevant to determining the nature and source of heat.
