> Generally, when one builds a liquid cooling system for his computer, what
> is the mechanism of operation of the liquid pump? For example, is it a
> piston pump? Centrifugal pump? What kinds are normally used?

The  most consistent requirement seem to be that they are made of expinsive=
um.
I would not be surprised if you can buy then withcrystal rotors and
OFC windings.
But  ...

Expect centrifugal in almost all cases to get easy highish head.
Peristaltic possible.
Piston also possible but tend to be extra cost when you can sell
centrifugal at high $ and get extra profit instead.

_______

Here's a slew to allow their methods to be examined.

           http://www.xoxide.com/wacopu.html

Of those, this fine example at $US80

    http://www.xoxide.com/swiftech-mcp655.html

.... is centrifugal, has its own microcontroller,
Maximum 10 foot head and maximum 50 psi, so we can already see the
OFC/crystals at work - ie 10 foot head around here is 10/32 x 14 =3D~ <
5 psi.
And no - the 50 was not a 5.0 typo as they say also 3.5 bar. Maybe
they are bah-cubs?
317 gph/1200 lph.
12v DC 2A nominal.
Hmm. 1200 lph x 9.8 (G) x 3.3M head  X 1/3600 h/s =3D~ 4 Watt-hour  SO
24 Watt-hour ~=3D 16% efficient may be about right.

Quick check 1200 lph =3D 333 cc/second
Water stores 4.2 J/g/K so for a 10K rise wattage able to be handled =3D
333 x 4.2 x 10

=3D~ 14 KiloWatt.

That should be enough for most cpus   :-)

_____________

Also centrifugal
More $
Less Watts
Less flow
Hald the pressure max
50% more head max.
This is fun.
Only good for 14 kW.

_______________

Slightly mote realistic

Thermaltake spare part.
$50

7.2W nom
500 +/- 50 litres/hour
Lift 1.8m - probably AT rated flow as they tend to be somewhat real.

5.8 kW cooling at 10C rise for perfect mixing.

"Adequate".

____________________________

Water heat capacity =3D 4.2 J/cc/K

So cooling capacity =3D  4.2 x  CC/second x degrees K (or C) temperature ri=
se.

So eg 100 cc / second at 1 degree rise handles 420 Watts IF you get
all water rising by that amount. (ie if average rise is that)




        Russell
--=20
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