From The Copper Development Association Inc. 
Condenser and heat exchange systems
 For the vast majority of heat transfer equipment applications, the transfer of heat takes place between two fluid streams. The heat exchanger is simply a device which directs the flow paths in such a way that the two streams are brought into thermal contact through a conducting wall while being kept physically separate. This thermally conductive wall is the tube in shell-and-tube type heat exchangers that make up a large percentage of such units in power plants, ships, the chemical process industry and in desalination. The relatively thin-walled tube, selected primarily for heat transfer efficiency, becomes the critical component in condensers and other heat exchangers and must perform well over long periods of time under sometimes very difficult operating conditions. Cu-Ni alloys have established a long and successful history in seawater cooled heat exchangers and will be emphasized in this paper....

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