On Tue, Nov 15, 2011 at 1:18 PM, James Bowery <[email protected]> wrote:
> On Tue, Nov 15, 2011 at 11:56 AM, Joshua Cude <[email protected]>wrote: > >> 2011/11/15 James Bowery <[email protected]> >> >>> If the pressure at the output thermocouple of the Oct 28 demo exceeds >>> the critical pressure of steam at the reported temperature, then there is >>> no heat of vaporization represented in the mass flow hence in the imputed >>> power level. >>> >> >> As Stephen Lawrence has emphasized, if the fluid is all steam at the >> output, then the temperature fluctuation corresponds to about a 1% power >> fluctuation. If it is all water, then it's about 2%. Neither seems very >> likely given the huge range of power outputs reported over the year. >> > > My understanding is that Rossi's primary problem in achieving self-heating > was fine tuning the control of the water flow rate so as to stabilize > temperature, rather than relying on an internal resistance heater to assist > in setting the lower bound of the target range. If that is the case, then > we should expect to see fluctuations in mass flow rate rather than > fluctuations in temperature -- regardless of phase. > I guess that's possible, although you might expect a kind of oscillation in the temperature, like you get with a thermostat. Where does he describe this? Does he use the output temperature in a feedback loop to adjust the flow? I haven't seen any indication of that in any of the earlier ecats, and not enough of the multi-cat was shown to see any evidence for it.
