I wonder if it is possible to run a toy test of an ecat based on a heat pipe design performance: 200 times the heat conductivity of solid copper rod?
On Mon, Feb 16, 2015 at 12:55 PM, David Roberson <[email protected]> wrote: > I put together a simple static model of an ECAT type of device and a > few vorticians were interesting in how it performed. One of these, Osmo > Laaksonen, took my very simple model and improved it as well as offered a > link to it for anyone to download. He has taken an ideal model of a type 2 > design and produced several important graphs that demonstrate how a system > of this type behaves. > > It should be noted that the device modeled is stable at any input power > although it contains a negative resistance region. Of course, you will > not be able to set the input to a fixed power level that results in static > operation within that special region. You will however be able to remove > the input drive and observe that the device cools back to ambient after it > goes through a transient condition. > > Osmo chose parameters that are closer to those seen in a real device > although we do not have adequate data to verify that this particular design > is possible. The geometry and the behavior of the fuel are key ingredients > that have not been well analyzed thus far. > > You will find that the device graphed obeys the two general rules that I > established earlier for an input controllable positive feedback thermal > system with reasonable power gain. First, there exists no temperature > within the region of operation where the internally generated power exceeds > the power being radiated, conducted, and convected into the ambient. This > ensures that no latch up condition occurs during operation. Also, the > slope of the input power versus device temperature contains a negative > region. This results in a negative resistance region which is desired in > order to maintain a good COP. > > The spreadsheet can be downloaded at: > https://docs.google.com/spreadsheets/d/1-a6DVROpImcdbLm7YQLe5cY3ZThm_k7wgJHc531Psgo/edit?usp=sharing > > I recommend that you download the file and take a close look at what it > displays. This type of characterization appears to enhance ones > understanding of how this type of system operates and will guide the > designs toward optimum results. Please direct any questions to me. > > Dave >
