Apparently the ERV measured 102.8 C @ atmospheric pressure. That is dry
steam.
That implies the customer used steam at a negative pressure.
On 8/23/2016 8:50 PM, Bob Cook wrote:
Dave--
The steam table indicates a condition of equilibrium between the
liquid phase and the gaseous phase of water. If the conditions are 1
bar at a temperature above the 99.9743 there is no liquid phase in
equilibrium with the steam (gas) phase. The gas is phase is at 102
degrees and is said to be super heated.
The steam tables tell you nothing about liquid phase carry-over in a
dynamic flowing system. Normally there would be a moisture separator
in the system to assure no carry-over.
Bob
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*From:* David Roberson <dlrober...@aol.com>
*Sent:* Monday, August 22, 2016 9:27:19 PM
*To:* vortex-l@eskimo.com
*Subject:* Re: [Vo]:Interesting Steam Calculation
Dave--
Where did the pressure of 15.75 psi abs come from? I thought the
pressure of the 102C dry steam (assumed) was 1 atmos.--not 15.75 abs.
I think your assumed conditions above 1 atmos. were never measured.
Bob Cook
Bob, I used a steam table calculator located at
http://www.tlv.com/global/TI/calculator/steam-table-pressure.html to
obtain my data points.
According to that source, 14.6954 psi abs is 0 bar at a temperature of
99.9743 C degrees.
At 102 C degrees the pressure is shown as 15.7902 psi absolute.
Also, at 15.75 psi abs you should be at 101.928 C. I must have
accidentally written the last digit in error for some reason.
Does this answer your first question?
You are correct about the assumed pressures above 1 atmosphere not
being measured directly. I admit that I rounded off the readings a
bit, but the amount of error resulting from the values I chose did not
appear to impact the answers to a significant degree. In one of
Rossi's earlier experiments the temperature within his ECAT was
measured to reach a high of about 135 C just as the calculated power
being measured at the output of his heat exchanger reached the
maximum. At the time I concluded that this must have occurred as a
result of the filling of his device by liquid water.
I chose 130 C for my latest calculations mainly as an estimate of the
temperature within the ECAT modules. The higher pressure (39.2 psi
absolute) was the value required to keep the liquid water in
saturation with the vapor. Rossi is using a feedback system to
control the heating of his modules and that requires him to operate
each at a few degrees above the output temperature(102 C?) as a
minimum. There is no guarantee that he regulates them at 130 C as I
assumed, but that temperature was consistent with having a ratio of
vapor volume to liquid volume of nearly 100 to 1.
Of course I could have raised the ECAT temperature to get a larger
ratio of flash vapor to liquid water at the output stream. Likewise,
the ratio would drop if a lower temperature is assumed. The 130 C
appeared to be near to his earlier design, and I had to choose
something. Do you have a suggestion for a better temperature or
pressure to assume?
Dave
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