There seems to be a great deal of contraversy related to the actual COP demonstrated by Rossi during his public tests. I especially recall the two that used the table top cubic device that he plans to place within his megawatt shipping model.
Several of us made attempts to calculate the thermal energy being delivered to the load and had various degrees of success. The input electrical energy was relatively easy to calculate since Rossi supplied us with the drive waveforms, but the thermal energy being delivered from the unit was not obvious. With this issue in mind, I was wondering how my latest computer model of the ECAT would perform under similar conditions. The results from the runs are intuitive and I felt that it should be reported. One observation that stands out is the relatively small value of COP that is obtained during a single input power pulse run. If a steady series of like pulses are applied to the ECAT it will result in a net COP that can readily average the 6 value that Rossi claims. Maintaining this COP is not trivial under the best of circumstances, but good control technique can accompolish the task. A COP of the value that Rossi plans to deliver in production (6) requires him to push the core temperature to a degree that is relatively close to the thermal runaway limit according to the model. The close proximity to the run away point enables the temperature decay process an opportunity to delay its transition downward. That delay is the key to delivery of a high COP. If instead of continuous operation you only desire one input drive cycle then the period during which you heat the box up to operational temperature is wasted to a great extent. Much of the input energy is applied during a time when the core is cool and not exhibiting any major positive feedback. That ensures that this initial heat merely becomes transferred to the output without much boosting. So, when the wasted input energy is taken into consideration and only one drive toward the thermal run away threshold is enacted, the model predicts that the overall COP would be around 2. Compare this to the COP of 6 that would be obtained under continuous input drive pulse conditions that Rossi describes. I use his published duty cycle (1/3 to 1/4) as the input waveform for my model. With this result in hand, it is easy to understand why the skeptics complain about the overall demonstration. This gives them plenty of opportunity to suggest that the COP is actually unity and it certainly would not be 6. A low COP is going to be generated unless a much longer test is conducted with a tight power control process. Dave
