The expert systems implemented in spreadsheet programs are not very popular and there is a common believe that their capabilities are strongly limited. However, our experience proved that this type of expert system could be very useful in the equipment selection. We recommend the development of the expert systems starting from the specialized tools and next transfer of the structured knowledge systems into spreadsheet programs. The paper prosents the spreadsheet-based expert system for the selection of stirred tank vessels. The general methodology of the mixers selection is presented first. The program structure and the implementation aspects are discussed further. The last part of the paper presents the example of the system application, comments about the obtained solutions and summary.
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