Re: The Joys of Cooling

[Chris Albertson <chrisalbertson90278@yahoo.com>]

Michael,

I can only think of a few things you didn't put in the
writeup below.  Don't know if they apply to your setup.

1) With a long plumbing run perhaps the coolent temp = air
   temp by the time it has made it to the camera.  maybe you
   need to insulate the tubbing or convert to larger diameter
   tubbing  Or do both, 1/2" PVC pipe and foam insulation is
   cheap.

   When you first turned on the pump cold water in the lines
   was pushed to the camera, later the warmer tank water got
   into the lines

Here is a real long shot

2) Where is the pump pickup in the tank, on the bottom I assume.
   I'd also guess the ice would be near the top as it floats.
   Possibly an hour after adding ice the tank temp is not
   uniform. Maybe you need to mix up the tank to get the
   cold water down to where the pickup lives.
   The action of dumping the ice
   would stir the water but it would settle down.  You may be
   sucking the water from the warmest part of the tank and
   measuring the tank temp at the coldest location.

   I sometimes have to use ice to cool photographic chemicals
   down to 68F in summer. I absolutly need to use a circulation
   pump if I add ice to a water bath if I want the bath to have
   a uniform temp.

3  You re-circulate the water.  You do have the inlet and
   outlet on oposite ends of the tank? 


When I ran my Mk III I used a good sized pump plus I put an
aqquarium "power head" in the water tank to keep the water
at the tank surface moving.  This caused enough evaporative
cooling that the tank would always stay cooler then the air
here in So. California.


--- Stupendous Man <richmond@a188-l009.rit.edu> wrote:
> 
>   I've been experimenting with the Rochester Mark IV.  Last night,
> I ran a test that gave some strange results.  I have some ideas,
> but hope that others can give me advice.
><SNIP>

=====
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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