Evening Dan,
>>At 10:35 PM 11/19/2006, you wrote:
I wouldn't necessarily choose this way to look at the problem unless
you had some way to meter the water flow.
I doubt that the flow rate is exactly 10 gpm thru the 3/4 pipe.
Of course if they know how long it takes to fill a tank, that is as
accurate as any flow meter, so it may be very close.
It is hard to do anything to a water system without adding pressure
drops and changing flow rates.
I found water systems design almost as interesting as electrical systems.
One of the first systems whereas I did total calculation of pressure
loss related to a 300 and 375 runs from a creek.
I studied a lot and worked a number of theoretical systems.
When I built the system, with 12 Sprinkler heads running, my pressure
loss was 2 PSI from pump to the sprinklers.
Needless to say, I was delighted. I never liked the way all this had
to be calculated and thought it to be primitive.
Of course, especially if you could not achieve the 6 amp current
level, you could slow down the flow and thereby increase the ppms.
Seems some water could make it hard to achieve the 6 amps, even
with proper circuits. I guess the close electrode spacing makes it possible.
I think eventually someone will build a state of the art system like
this. Some degree of automation and sensing would be used.
Automatic spacing of the electrodes could be accomplished.
Some very good EC sensors are available at a reasonable cost.
A number of other sensors could all be combined with the Faraday
formula . Even the voltage levels and current would be controlled
by the program. I am sure I could write a program to do it all.
Sounds like fun !
These things are best done by unpaid people who do if for the
love of the game. That way, 6 months or one year to perfect the
system is in order. No rush for sure.
Using your values, 631 ml of water for 1 second at 6 amps
we get 10.84 ppm.
So, this is very close to what we calculated before.
Yes, I expected that. I did not feel it was necessary but I was
curious and felt it may be interesting to some that have never
thought of stream velocity in a piping system.
The higher the stream velocity, the greater the pressure loss.
To achieve low pressure loss, the stream needs to be slower and pipes
larger. Much like using wire too small in an electrical system.
Bigger wires, less voltage drop, bigger pipes, less pressure loss.
It would be good if several people were building systems like we have
been discussing. One is not enough. <grin>
Wayne
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