On 11-11-11 09:07 AM, Jed Rothwell wrote:
David Roberson wrote:
You answer is clearly indicated by the temperature readings at T2.
This was very constant.
Yes, of course. It has to be very constant. The pressure did not
change, so the steam temperature did not change.
This again!
For a flow through boiler with constant water flow rate, said rate being
fixed independent of the power generation level and output temperature,
it's *only* true that steam temperature is fixed by the pressure if the
effluent is a mixture of steam and liquid water (whether as entrained
droplets or as an actual liquid flow).
You can't have it both ways. Either the steam is dry (complete
vaporization), in which case the temperature and pressure of the
effluent are independent, or it's not. Your assertion that the output
temperature depends directly on the pressure is a tacit statement that
it's not producing dry steam.
Steam behaves as a "magic" gas which disobeys PV=nRT *only* when it's
buffered by liquid water.
When heat increased, more steam was generated,
Only if either (a) the effluent was a mixture of steam and water, or (b)
the pump rate was increased. Absent either of these, the mass of steam
produced must have been constant.
In case anybody hasn't gotten it, let me repeat it: The rate of mass
flow *out* of the device is fixed by the *pump* *rate*, not by the power
level. If the stuff coming out is 100% dry steam, then its temperature
must depend on the power level, not just on the pressure.
but the temperature of that steam did not rise. When more steam
entered the heat exchanger, the temperature of the cooling water rose.
- Jed
