Actually the characteristic curves suggest that the input power acts like a bias that stands behind the incremental behavior. If that bias is quickly removed then there should exist a point of operation that is located ahead of the dangerous region. Unless some strong memory exists, I can imagine that the process would reverse as we all hope.
I think of the total operation point and its associated performance as being related to the Taylor series. That can also be applied to transistor networks where the output signal is very tiny or non existent when the DC bias is removed. Take away the bias and you kill the gain. We are going to need much more detailed data and many measurements in order to pin these devices down completely. It is refreshing to see that we appear to be on the verge of having that to occur. I agree that the load is a very important part of the equation. Any technique that can extract a large amount of power from the core should be able to pull the device toward stable operation. Of course it might require a heat sink of super capability once the reaction has advanced too far. Rossi was able to use cool water as you point out, and I personally like that idea due to the great amount of heat needed to raise the water temperature beyond boiling. One thing I noticed was that during the latest melt downs the input power was never reduced until the drive elements died. There did not appear to be much warning of the impending danger, but a preplanned pulse width drive could be used to anticipate that behavior to some extent. It would be much better to design a type 2 system from the beginning if it is possible. Dave -----Original Message----- From: Roarty, Francis X <[email protected]> To: vortex-l <[email protected]> Sent: Tue, Feb 10, 2015 6:16 am Subject: RE: [Vo]:Explosion May Be Out of Control LENR On Mon Feb 9 David said [snip] Since the original product was very close to becoming unstable, with the increase in gain the latest experiment most likely resulted in a situation where the positive feedback gain exceeded unity. This is just another way of saying that a negative resistance region is now present. Of course, once the input power pushes the temperature into that region the device will self sustain all the way to thermal destruction. This increase in temperature can be extremely rapid since it is of an exponential nature. [/snip] Agreed, even with power off but did not Rossi always have to carefully manage the coolant flow – This appears to be a workhorse that relies heavily on the load to choke it back as opposed to removing drive, that is to say once self sustain is present only additional loading can balance it and the drive is effectively out of the picture. Fran From: David Roberson [mailto:[email protected]] Sent: Monday, February 09, 2015 8:47 PM To: [email protected] Subject: EXTERNAL: [Vo]:Explosion May Be Out of Control LENR I just read the latest facebook entry by the MFMP group and suspect that they witnessed an explosion due to a thermal runaway event. The latest Parkhomov experiment appears to indicate the same out of control system problem. We know that the earlier Parkhomov device was stable but appeared to be on the verge of entering a negative resistance type of operation. The slope of power input versus temperature for that original system was very close to zero but slightly positive according to the data he reported. Although I would like to have a much more extensive collection of points defining power input versus temperature, I am having to assume that the curve connecting the three given points is relatively smooth. This is not too much of a stretch since the entire temperature range over which the points are taken is very limited. When Parkhomov increased the insulation surrounding his device for the recent testing, he effectively increased the positive feedback gain by a large amount. With the insulation the amount of input power required to obtain the same temperature readings was substantially reduced. It seems reasonable to assume that the core generates the same amount of heat power when subjected to the same temperature. If this is true then the ratio of internally generated power to input power must become larger at any temperature where internal heat is being generated. Since the original product was very close to becoming unstable, with the increase in gain the latest experiment most likely resulted in a situation where the positive feedback gain exceeded unity. This is just another way of saying that a negative resistance region is now present. Of course, once the input power pushes the temperature into that region the device will self sustain all the way to thermal destruction. This increase in temperature can be extremely rapid since it is of an exponential nature. With this thought under consideration I strongly suspect that the MFMP team observed the same sequence of events. Until they increased the drive level to the threshold of destruction everything would have appeared fairly normal. The main difference I would expect is for the temperature to rise faster than expected had a dummy system been driven in a like manner. Unfortunately, it might be a fine line between a stable input drive power and the initiation of run away. My take on the debris following the explosion is that there is evidence of an extreme heating event having taken place. The spheres of molten metal along with the other indications is pretty strong evidence. I do not believe that the time frame during which the heat is emitted is necessarily very long in duration. An exponential release can occur very quickly and the heat is confined by the structure as the damage is being done. To prevent this from occurring too often, I would recommend that the amount of fuel be reduced significantly for the earlier testing. A curve can then be constructed under stable conditions which will act as a guide to indicate how much fuel can be inserted before the thermal run away condition can begin. Perhaps the fact that MFMP guys and Parkhomov did such a good job of sealing in the hydrogen under a large amount of pressure is the root cause of the issue. There remains many unanswered questions, but the important fact is that we may now be witnessing an excellent example of LENR. Dave
