Is that what all that ruckus was outside last night? Huh.
On Tue, Dec 31, 2013 at 9:45 PM, MarkI-ZeroPoint <zeropo...@charter.net>wrote: > Dave, > > It’s New Year’s eve… > > Go have a drink and give the grey-matter a break!!! > > J > > Happy New Year, > > -mark > > > > > > *From:* David Roberson [mailto:dlrober...@aol.com] > *Sent:* Tuesday, December 31, 2013 7:13 PM > *To:* vortex-l@eskimo.com > *Subject:* [Vo]:Tickle The Dragon > > > > I constructed a new computer model of the ECAT that allows me to modify > the variables quickly and made some interesting observations. If the > internal temperature of the device reaches the thermal run away level, then > it is on its way toward self destruction as Rossi has mentioned on several > occasions. It is speculated that he could still reverse the action if some > form of active cooling is incorporated within his design to pull it back > from the brink. My latest model suggests that the amount of deviation away > from the thermal run away temperature determines how much cooling is > required to salvage the system. > > The other side of the equation is also valid. If we assume that the drive > is removed at the optimum time, which is when the internal temperature is > close to but slightly below the run away point, then the device will > immediately begin to cool off and head toward room temperature. This > behavior is a typical positive feedback loop where the change in direction > reinforces itself and the action gains momentum with time. The longer you > wait before you correct the direction, the harder the task becomes. > > With this in mind, I toyed with the new model to see if it might be > possible to use this behavior to our advantage. The model suggests that > this is the case and that the net COP of the device can be quite large if > it is possible to keep the control input power pulses to low values. For > this to operate it is necessary for Rossi to run the ECAT at very near the > thermal run away trip point. The closer, the better and this reminds me of > tickling a dragon. You better be careful or it might get angry and you > know the consequences. > > I initiated the output power by supplying a large power pulse which is > required to push the operation into the negative resistance region so that > the positive feedback takes over and the modeled temperature begins to > climb toward the thermal run away level. The temperature climb takes place > while the large drive level is active so that control is available. Once > close operation to the trip point is achieved, the power input is rapidly > removed. This removal of input power is the control method which causes > the positive feedback system to reverse direction and begin its path toward > cooling to room temperature. > > Then, my new test control concept is put into action. I monitor the > internal feedback power which falls rapidly as the device cools even though > the temperature and output power falls quite a bit less due to the > polynomial power effect. The reversal can be achieved by supplying power > greater than the difference between the self sustaining power and the > internally generated power. The actual power required approaches zero if > the temperature can be kept at a tiny amount below the thermal runaway > temperature. If active cooling is available, then both sides of the trip > point could be used. > > The model demonstrates a very large COP, but of course changes in the > environment such as the temperature of the coolant and its flow rate as > well as many other factors must be considered to determine a safe operation > temperature band. And, since the ECAT is not available to test it is not > possible to establish real time constants for accurate modeling. With > these constraints I have constructed a very general model that can be used > to generate concepts and to see how some of the variables interact. I have > no way to obtain delay information at this time and of course, that will > complicate the performance greatly if excessive. > > I want to mention that the recent statements that Rossi has made on his > blog strongly suggest that the ECAT operates in a manner that is consistent > with my model. It is interesting that I can immediately place his numbers > into my model in a location that makes sense. The latest discussion of the > mouse having a reverse relationship to the main cat does seem out of line > unless he is using words to obscure the meaning. > > Dave >
