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The factors that are affected by number of tubes in shell and tube heat exchanger is the rate of heat transfer and flow rate.
To passivate an exchanger gently pat the shell while whispering into a bleeder
about 10% of the total number of tubes
double pipe heat exchanger is made if two concentric tubes one carrying cold flow and the other one carrying hot flow. but shell and tube hear exchangers are made of a shell like a vessel filled with many thin tubes to transfer heat between fluids. there are more data available at : http://scopewe.com/double-pipe-heat-exchanger-design-part-1/
Advantages of shell and tube heat exchanger are: * Its compact design * Capability of withstanding high pressure Disadvantages: * It is difficult to readily inspect the shell side of the tubes for scaling or tube damage