Nice model Dave. Now, try it if the output temperature remains steady at 1200C as Rossi claims. This implies very little positive feedback. What COP would he achieve?
Jojo ----- Original Message ----- From: David Roberson To: [email protected] Sent: Friday, August 24, 2012 7:54 AM Subject: [Vo]:ECAT Model with Interesting Correlations I have been fiddling with one of my models of the ECAT and just wanted to let the group have a peek. Rossi has been active on his journal and suggested that his device has certain characteristics which my model tends to support. It should be noted that any model of Rossi's device is going to be lacking at this point in time since very little reliable information is available. My objective in this case is to reveal that a relatively simple model does in fact give results that are reasonably consistent with what he claims. Please realize that these results are at best speculative and should be considered educational but not accurate. With this disclaimer, I will proceed with the disclosure. The model consists of a power drive source that supplies heat to a device that internally generates excess heat that is proportional to the second order of the absolute temperature within. The net heat is thus the sum of the drive power plus the contribution of the internally generated heating process. Since the internally generated heat energy is defined as E = k * T * T, very little shows up until you approach the operating region. I have experimented with various heat output functions, such as exponential, linear or third order in the past. Each of these has an interesting behavior and I plan to investigate further. The model I am discussing in this report behaves a great deal like what Rossi mentions in his journal. For one thing, there exists a well defined temperature where the device goes into a positive feedback self sustaining mode. Unfortunately, once that happens, it is difficult to control unless a form of active cooling is incorporated into the design which quickly drains heat from the device. In this model, I am assuming that there is no such process available. So, to keep things sane, I allow the output power to reach a peak power that is 90% of the self sustaining level. When the temperature of that state is reached, the input power is reduced to zero. At power levels that are less than the self sustaining point the device immediately begins to cool and will eventually cease to generate excess heat. An interesting note is that the closer one drives the unit to self sustaining, the longer is the initial time constant before the heat rapidly declines. This characteristic allows Rossi to push the device harder if necessary to achieve a higher COP. Now, my model allows me to reapply input power after the internal heating has declined to the point that I desire. In the real world this function could be achieved by using a temperature sensor driving a control network. In my current example I find that a drive duty cycle of 41 % seems to fit Rossi's description relatively well. The average power output of the system divided by the average power input required to obtain this result is 6.028. This figure is very much in line with his standard 6.0. The ratio of the peak system power output to the peak power input is approximately 2.7. One of Rossi's answers to a blog question states that he drives the unit with a 3 to 1 ratio by my interpretation. In the same context, he states that his duty cycle is 50% which is a bit higher than my model results. In my opinion this simple model seems to add support to the description given by Rossi and that is interesting. I would expect the behavior of the real ECAT to be more complex by far than the simple model that I used, but there seems to be correlations. So, I suggest that you guys file this report away in the reaches of your minds, with the understanding that there might actually be substance to what Rossi is telling us. Dave
