The various processes occurring in shell and tube heat exchangers are examined for their dependence on the physical properties of the fluid streams. This dependence, coupled with estimates of likely uncertainties in the various properties, is used in developing a simple procedure for evaluating the resultant uncertainty in heat exchanger design calculations. Two case studies, which use a well-tested computer program, have shown that the above procedure adequately quantifies the uncertainties in the calculation of heat transfer area and pressure drop.
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