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Q: Electrostatics

Discussion in 'Electronic Design' started by Mark Jones, Dec 12, 2004.

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  1. Mark Jones

    Mark Jones Guest

    Hi. I have this old 1981 H&R General Electric 15kV/1mA DC supply. It
    works like a charm, although I have no idea what it came out of. But
    I've been thinking of using it for electrostatic air filtration.

    In the furnace return-air duct, I'd like to open up a section and
    slide in a well-insulated and grounded "module" consisting of a series
    of positively-charged collection plates (parallel to the flow of air)
    and a negative ion supply "grid" ahead of this to emit ions. Of course
    the plates are easily removable for cleaning.

    Yes they make electrostatic furnace filters commercially, but damn
    are they expensive!

    Questions, hopefully someone can help:

    1. Is 15kV too high an EMF? Most tabletop ionic devices seem to
    operate around 7kV/10uA but a furnace duct would have a much larger
    air volume and velocity.

    2. Would the distance between emitter and collector matter much in a
    forced-air system?

    3. Is there a way to calculate the length and diameter of "grid"
    needed to facilitate ionic production vs. ozone production?

    4. Is there a way to calculate optimum collection plate dimensions
    and surface area?

    Or will this all need to be trial-and-error... I don't fancy the
    notion of patching a gaping hole in the furnace ductwork if the
    prototype flops. :)

  2. Mark Jones wrote...
    I don't think that old 1mA supply has a high enough power capacity.
    You'll also need large a pulse-rated high-value 20kV glassmike cap.
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