[Beowulf] /. Swedish data center saves $1 million a year using seawater for cooling

[Mark Hahn]

> Do they not recycle the heat?

if it's warm enough, sure.  for a conventional cluster, with cold
side around 20C, the "hot" air will be 30-35C.  that might be 
interesting during winter in cool climates.  IBM has an interesting
system called Aquasar which addresses this: it uses water directly 
in node heatsinks.  this dramatically reduces the thermal resistance 
of the system, which means the exhaust heat can be much closer 
to the die temperature: 60C rather than 30ish.

regards, mark hahn.