RE: Little Giant Pumps

["Albertson, Chris" <CAlbertson@primeadvantage.com>]

Tom,

Some ideas:

What about replumbing so that the pump feeds a manifold
and then each camera takes it's cooling water from the
manifold.  This way there is no "down stream" camera.
I know "manifold" sounds complex but in this context it
is likely that manifold = 1/2 inch plastic "Tee" fitting.

For you electrical enginerring types:  what I mean is to
"wire" the cameras in parallel rather then series.

One other idea.  My TASS Mk III water tank is elevated.
I keep it on a stand on a bench.  the water level is
seven feet off the floor.  The pump has less work to do
this way.

Also.  I have an open cell sponge filter on the pump intake.
Very cheap and simple.

You can get cheap, high volume quick disconects at 
Home Depot in the garden section.
I've installed these on the garden hose I
keep in front of the house.  They allow a lot more then
a few gal/hr to pass and will hold back my 125PSI water
pressure when disconnected.  About $5.00 each



> -----Original Message-----
> From: Tom Droege [mailto:tdroege@veriomail.com]

 
> Sigh!  I have spent the last few hours with anti-freeze 
> dripping off my 
> chin.  Everything is on the floor and I have to crawl around 
> to fix the 
> water system.  I now have a bare trickle running through the 
> system.  It is 
> probably enough.  One does not need much.
> 
> Let's see:
> 
> Allow a 5 F rise through the system.  There is about 3 amps 
> max drawn by 
> the TECs.  This is 36 watts.  One has to get rid of this plus 
> the heat 
> pumped out of the cold side.  Let's guess 7 watts per camera. 
>  That is then 
> a total of 50 watts.  This is 170 btu/hr.  170btu/5F = 34 pounds per 
> hour.  At 8 pounds per gal this is 4 1/4 gal per hour.  Hmmm! 
>  I wonder 
> what it is.
> 
> OK, I measured it.  I am getting 2.2 gph.  So the temperature 
> rise is more 
> like 10 F.  This means that the down stream camera is seeing 
> 5 F hotter 
> water than the upstream one.  This will cost 2.7 C over what 
> I could get 
> with higher flow.  2.2 gph is really just a trickle.
> 
> The problem is those nice self sealing disconnects that I use 
> on the back 
> of the camera.  They do not have a very large orifice, and it 
> tends to get 
> clogged.  So take care.  I have reconnected the water filter 
> even though it 
> causes a pressure drop.
> 
> I think I need a Medium Giant pump instead of a Little Giant.
> 
> Tom Droege
> 
>