Re: Rochester status report, Jan 2, 2002

[Chris Albertson <chrisalbertson90278@yahoo.com>]

>   One of my colleagues here suggested I re-wire the coolant system
> so that it runs through the two cameras in parallel, not serial.
> That would be cheaper than buying a big (1/6 HP) new pump, but
> would take more work outside in the cold without gloves.  Sigh.
> I'll let you all know what happens.
> 
>                                               Michael Richmond

Michael,

If you parallel the cameras by putting a "Tee" in the line
you can't be sure the coolant will
flow evenly between the cameras.  It could even be a 10%/90%
split and worse it could (will) change as the mount moves
around.

It is the same as an electronic circuit where you parallel two
diodes to handle a larger load.  One will have a lower forward
resistance and take more current and blow.  The trick is to
add a small resistor in series with each diode.  That may work
with water but adding that "resistance" will force you into
a larger pump anyways.

It may be cheaper to use two small pumps and make two independent
cooling loops.  At least the flow would be deterministic.


=====
Chris Albertson 
  Home:   310-376-1029  chrisalbertson90278@yahoo.com
  Cell:   310-990-7550
  Office: 310-336-5189  Christopher.J.Albertson@aero.org

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