Quote:
Originally posted by nicozeg
You're complicating more than necessary; The systen's already making a lot of heat. If ambient is too cold, you only need to stop airflow thru rad. Generaly, coolant temp 10ºC colder than room dont cause condensation.
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A lot of heat yes, enough to keep the liquid room temp on a cold winter day? absolutly not! Even if the airflow is shut of. I have had to work on the roofs of building in a middle of a snow storm at 0F on a windy day. There is plenty of cold to drop the temps down below the room temp. All it takes is ONE extreamly cold windy day to destroy thousands upon thousand's of $'s of equipment! Would YOU take that risk? I know I wouldn't.
There are ways around this though without adding a heater. You can make a bypass valve that will direct the warmed water back into the main line without going through the exchanger, but you DO NOT want to completly shut off the liquid flow through the exchanger as that will freeze it and wren the bypass valve closes you will have no flow. Then that would be a good test for the overheat sensors you would have to attach to each peice of equipment that are connected to a main shutoff switch.
There are reasons liquid doesn't cool this amount of high $ equipment already. If it was as easy as some make it out to be in this thread it would have already been done a long time ago!
The military does this but not on such a large scale, and they always have a backup system in case of disaster. This is not possible/economical for a server room application.