On Fri, Jun 24, 2011 at 1:05 PM, Jed Rothwell <[email protected]> wrote:
> Joshua Cude wrote: > > It is not necessary to do any tests to know that with a given input flow >> rate of water at room temperature, if the output fluid is at 100C, the >> corresponding power for 99% liquid (by mass) is about 7 times lower than it >> is for 100% steam. >> > > This vessel is shaped like a teapot or a steam locomotive. For a reason. > Unless the liquid flows through too fast and overflows, only dry steam can > escape from it. And yet, before it is boiling, liquid water escapes from it. Below the boiling point. > If it was overflowing that would be obvious from the temperature. > How? If part of the water was converted to steam, then the water/steam mixture would be at 100C. > > The vessel will boil away all of the water at these flow rates. There is no evidence that it does that. > It is not pressurized, so the temperature will be just over 100°C. You don't need pressure to increase the temperature of dry steam above 100C. If vessel produces more heat than is needed to boil away the water, the > vessel itself will get hotter, and radiate into the surroundings. > If the vessel gets hotter, the water will boil earlier in its path through the device, and the steam will have to get through this hotter device. When you pass air, far above its boiling point, past a heating element in a furnace, what happens? Why, it gets hotter. That's how I keep my house warm in winter. The heat capacity of steam is pretty small (half that of water), so only a little heat transferred to the steam would show up as a substantial increase in its temperature. > > This has been common knowledge for 170 years. Anyone familiar with teapots > knows this. It's not a teapot. The fluid is pumped through the system. > The speculation and handwaving here about a magical ability to make water > appear to boil with far less energy than this is complete, 100% pure, > unadulterated bullshit. > To get water to boil, you only have to heat it to 100C. To convert it all to steam takes 7 times the energy. That's been known for 170 years.
