2011/11/15 James Bowery <jabow...@gmail.com> > 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. So, the relatively stable temperature is strong evidence that the fluid is a mixture of phases at the local boiling point. The small fluctuations that do occur probably result from somewhat erratic pressure.
Moreover, the fact that the temperature of 105C is reached within minutes of reaching 100C, is even stronger evidence that 105C does not represent pure steam. An eightfold increase in power transfer in a few minutes seems implausible given the thermal inertia evidenced by the 2-hour or more warm up period.
