Joshua Cude <joshua.c...@gmail.com> wrote: element is always completely submerged. I.E. input flow is adjusted so >> that it matches evaporation rate. >> > > First of all, the flow rate is not adjusted in any of the demos after the > experiment is started. >
Correct. Only the anomalous heat output is adjusted. The only thing that is necessary to account for a flat temperature is, as > you say, that the flow rate is high enough so that the entire heating > element remains wet. > Right, but if it overflows, the incoming cold water will replace the hot water, and it will fall below 100 deg C. That's what happens with other experiments close to boiling with flow calorimeters. You cannot keep it right at 100 deg C when it overflows. To believe that all the water is converted to dry steam at the bp, would > require (1) that Rossi knew beforehand the exact flow-rate to balance the > power, and (2) that the power remain stable to a per cent or so. > Not a per cent. Just boost it a little if the temperature falls below 100 deg C (starting to overflow), and back off if it seems to rise much above 102 deg C (drying up). There is plenty of space for a reservoir of water in there. It would take a while to fill up to the top, or boil off to the bottom. Besides, Rossi has run it many times before; he knows how to control the anomalous power; he knows what the incoming flow rate is; and he knows high he should set the anomalous power to match the flow rate. The response time to adjust the heat is about the same as it is for a cook to keep a saucepan of boiling vegetables from boiling over or running out of water and burning. > Secondly, why would he want to do this? Allowing the steam to go above the > bp would give him the evidence he needs to shut the likes of me up. > He does not want to overheat the thing. He told me that. - Jed
