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Little Giant Pumps
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.
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.