Liquid cooling systems and apparatus and data processing systems and
communication systems with liquid cooling systems are presented. A number
of embodiments are presented. In each embodiment a plurality of heat
transfer systems capable of engaging a plurality heat generating
components and each such heat transfer system adapted to transfer heat
from the heat generating components is implemented. Each of the heat
transfer systems is in liquid communication with a heat exchange system
that receives heated liquid from the heat transfer systems and returns
cooled liquid to the heat transfer systems. The liquid communication
from/to the heat exchange system and the heat transfer systems is in
parallel, in series or a combination of parallel and series. Another
embodiment disclosed is for data processing systems and communication
systems having rack mounted sub-assemblies which can be inserted into or
retracted from a rack or other holding device (and even while the data
processing system or the communication system is operating) wherein the
liquid communication to the heat transfer systems on a sub-assembly may
be switched on or off. Another embodiment is disclosed for the cost
effective and noise-muffling deployment of fans in a liquid cooling
system having more than one heat exchange system therein.