I think this is all a matter of self sustain mode needing much finer control about a threshold point while powered mode can use a duty factor approach where the material is constantly being reset much further below threshold then pushed back into runaway every cycle. When he removes the high current heating pulse to enter self sustain mode he uses a low current pulse generator to keep the reaction under "gentle" control.... Rossi has already heated the powder to start the reaction and then established a very careful balance with heat extraction such that he only needs a little energy to start running away - extend the on time so the runaway supplies additional heat then let water flow extract the additional heat and bring the reaction out of runaway during the off period - obviously he must have a control loop that rapidly modifies the duty factor to fit the cooling flow rate since cooling rate can not be varied quickly enough. I previously assumed this system would require absolute uniformity in powder geometry to prevent hot spots but these systems are prone to self destruction and his procedure might just degrade these hotspots into the needed uniformity. IMHO the enabling geometry may occur frequently between nano materials but immediately self destructs as fast as it forms except when heat energy is being extracted to preserve it. Without heat extraction the Rossi material would give one rapid heat spike like some of the Rowan confirmations of the Black Light powders and be done. Fran
From: Jeff Sutton [mailto:jsutton.sudb...@gmail.com] Sent: Wednesday, November 09, 2011 1:54 PM To: vortex-l@eskimo.com Subject: EXTERNAL: Re: [Vo]:Control Mechanism Agreed regarding self-sustaining time and there is something in the reactor that needs to be "reset". I suggest however, that simply adding heat again cannot be it as that is saying one type of heat is different from the other. Is the heater a DC device or AC with some important frequency? On Wed, Nov 9, 2011 at 1:43 PM, Jed Rothwell <jedrothw...@gmail.com<mailto:jedrothw...@gmail.com>> wrote: Jeff Sutton <jsutton.sudb...@gmail.com<mailto:jsutton.sudb...@gmail.com>> wrote: "He has shown it in "self-sustaining" mode but always shuts it down after a few hours with some excuse. Why does he do that when the blockbuster note would be "the ecat just keeps on going." I suggest this must mean that the ecat cannot just keep on running for 6 months has he notes; at least in self-sustaining mode. . . ." Did he say it can go 6 months in self-sustaining mode? I don't recall hearing that. He said that one of them ran for a year or so in Italy -- the address was listed in a patent. But I do not think it was self-sustaining the whole time. I don't know if it was self-sustaining at all. The data from that patent always shows some input power. Technologically, there is no point to a self-sustaining reaction. A reaction with a low level of input power to control it is better. Rossi has said lately that 6 hours is about the limit of a self sustaining reaction. The reasons are unclear. Maybe it peters out. Or does it go out of control? Who knows. - Jed
