At 10:29 AM 8/5/2011, Daniel Rocha wrote:
By knowing the RH, you will know the steam quality, adding temperature and output, you will find the pressure inside the chamber.
That's nonsense. Relative humidity maxes at 100%. The device used doesn't even reach that level.
Steam quality has little relationship to pressure because liquid water takes up so little volume compared to water vapor, gram per gram.
If, as you claim, RH corresponds to steam quality, try to find a conversion table. In fact, measuring steam quality is a difficult business, it's far from simple.
The temperature, however, if we assume saturated steam, will indeed tell us the pressure. Wet steam will, with constant pressure, maintain that same temperature over a range of 0-100% steam quality. (at 0% it's pure liquid water, no vapor. At 100% it is dry steam.)
The only way to derive steam quality from temperature would be to verify that the steam is hotter than the temperature for wet steam at the known pressure. Dry steam can get as hot as you can make it. Wet steam is, at a pressure of 1 bar, nailed to a temperature of 100 C.
It goes over that value in the E-cat because there is pressure from steam generation.
People should really get this: there is practically no way to make try dry steam without taking special precautions to separate the liquid and vapor phases, after the water has been boiled. Boilers ordinarily produce wet steam, typically 95% quality. I suggest looking up steam quality, there is lots of information about it on the web.
Boilers, however, do not ordinarily have liquid water spilling over the edge of a hole in the side of the boiler, at a pace determined by the difference between the pumped rate and the vaporization rate. If there is substantial steam (my very rough estimate is 5% vaporization, under Rossi conditions) the water will be atomized by the flow of steam, the steam will go from 5% or so (normal) wetness to as high as 95% wetness. I.e, 5 % quality.
