The objective of this work is to develop an interactive computer aided preliminary design program for shell and tube heat exchanger based on the Bell (Delaware) method with internal evaluation of all required physical properties utilizing the best methods in the open literature known for their accuracy and reliability. FORTRAN90 is the program language used in this work. All mechanical and geometrical required data are internally evaluated. This program will be used to study the performance of Bell (Delaware) method by comparing the results obtained via this program with experimental data from industry. Cost estimates are to be generated by the program for all components, using very well known cost estimate techniques. Finally, the developed program was tested for accuracy and consistency against existing design cases from industry. The program was tested with other six experimental samples, and it was found that the program work accurately and the percentage of error in most parameters are in the allowable.

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