My model is really quite simple and does not handle sintering of the materials. The turn around temperature can be set by adjusting the parameters of the model and is chosen to approach the real world information that is available. As you know, Rossi does not give out very much to work with.
I view my model as a guide to understanding the behavior of the Rossi like devices under temperature excursions. Maybe later it can be improved to be more accurate. Dave -----Original Message----- From: Eric Walker <[email protected]> To: vortex-l <[email protected]> Sent: Thu, Aug 30, 2012 11:58 pm Subject: Re: [Vo]:ECAT Simulations With Third Order Temperature Dependency On Thu, Aug 30, 2012 at 3:38 PM, David Roberson <[email protected]> wrote: I wanted to mention one observation that is fairly important. If you set the upper turn around timing extremely critically, it is possible to get a very large COP. The reason is that the time constants associated with the thermal resistance and capacitance become quite large. The timing is as critical as it is large however and the system is balanced upon a sharp edge. It typically does not take long for the positive feedback to dominate and the curve begins a rapid decent. It sounds like your model suggests that it is fairly easy to have a power excursion that sinters the substrate if the device is operated at too high a temperature. I wonder whether this is behind Defkalion's using discrete spikes spikes in the input power rather than a continuous drive. Perhaps they find this eliminates some of the feedback problem. Are you including a stochastic component in the temperature as a function of the input power? If you do, I suspect the model will have to be operated at a lower average temperature than if the model were purely deterministic. Eric
