Cooling and leaks; was: removing parts from PCBs ?JUNK MAIL? 4

[Dwight K. Elvey]

>From: "Doc Shipley" <doc at mdrconsult.com>
>
>Chuck Guzis wrote:
>
>> On 11/21/2005 at 12:55 PM Eric J Korpela wrote:
>> 
>> 
>>>The drawbacks of this system are that you need to prime it, and that a bad
>>>enough leak will disrupt the coolant flow, so you need to monitor the flow
>>>rate or have a decent thermal shutdown mechanism. You need that in case of
>>>pump failure, anyway.
>> 
>> 
>> Why not simply use a standard sump pump?  Most such pumps can push a 15 or
>> 20 foot head and don't need to be primed. 
>
>   I think that putting the computer higher than the pump can push is 
>the point.   If the computer's on the low-pressure side of the circuit, 
>(the pump is *pulling* water through instead of *pushing* ) it would 

Hi
 Not actually pulling. It would still be pushing but the
top part of the system would be siphoning. This means it has
negative pressure relative to the air.
Dwight

>take a very large leak to get the system wet.  It'll pull air into the 
>water lines, instead of pushing water out into the electronics.
>
>
>	Doc