Please use the search funtion.
Quote:
Originally Posted by
ydeardorff
OK, Are you referring to overall 28% KOH per gallon, or per liter? That's an awfully high concentration.
Wouldn't that high of a percentage eat the plates for lunch, and spontaneously melt all of your wires running the cell? LOL
The highest I have heard anyone running their cells was about 5 or 6 tea spoons per gallon.
There are numerous posts of people using the 28% KOH (mass percentage) for lower resistance and for better anti-freeze protection.
The reason others use only a few percent KOH is because they are controlling the amperes this way. High resistance low percentage electrolyte reduces the current but is low efficiency.
At this point, I will bow out of this conversation as you have your pre-concieved ideas. Good luck making 30 watts of heat from your 100 watt input.
Excuse me for butting in again.
Quote:
Originally Posted by
ydeardorff
thats what I was planning. 28% is far higher a mix strength than Id like to go with for an indoor appliance. @28% seems like Id need a pwm with a heat sink on it the size of a small volkswagen.
My latest cell got a MMW of 6 @ 50 degrees electrolyte temp. So that's a good starting point @ 3 teaspoons per gallon. The search function works fine.
I was looking for a mix ratio to plate gap, and cell size, to go along with a pwm duty cycle and frequency.
Never mind I guess Ill just figure this stuff out myself. Sry for bothering the "mentors" LOL
It was my fault for getting off on the tangent of system viability and efficiency.
If you want absolute electrolysis efficiency, you must reduce the voltage across each cell. Current is needed to produce HHO, but the lower your voltage across each cell, the higher your MMW.
The more concentrated your electrolyte ( up to saturation) the lower your voltage needs to be to drive a particular current. Some electrolytes are more effective than others but it is hard to beat KOH as a common material.
The closer your cell spacing the lower your drive voltage.
The higher your electrolyte temperature the lower your drive voltage.
"Better" electrode plate materials can reduce your drive voltage.
I use true Faraday type cells instead of the through hole "dry cells" or the wet bath arrangements. This means I can optimize a single cell for the current capacity of my power supply. Notice current is largely unaffected by plate area. Just make sure plate area is large enough to keep you in the 0.5amps/cm*cm or less, to keep plating and erosion minimal.
I use 304 tubular stainless electrodes spaced 3mm (1/8") apart. For example: Saturated NaOH electrolyte yields a current/temperature/voltage curve of 5A/25degC/2.6V, 10A/40degC/2.3V and 15A/80degC/2.0V.
These may not conform to other's test numbers, but it allows me to design based on my cell configuration by simply stacking the number of cells to meet my power supply capabilities and the temperature I expect to operate at. This allows you to maximize your MMW.
The value of the answers isn't guaranteed by mentor status.
Quote:
Originally Posted by
Stevo
Excellent idea, sir!
The list of Mentors shows a great variability in the ability to answer questions with lucidity.