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Methodological Framework for Synthesis of Multiperiod Heat Exchanger Networks with Minimum Total Annual Cost Using an Optimization Model and Area Reassignment Technique

Journal: International Journal of Mechanical and Production Engineering Research and Development (IJMPERD ) (Vol.10, No. 3)

Publication Date:

Authors : ; ;

Page : 14161-14174

Keywords : Heat Exchanger Network Synthesis; Total Annual Cost; Multiperiod; Area Reassignment; MINLP;

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Heat exchanger network synthesis is one of the most important fields in the chemical processes. They are used to exchange heat among hot and cold streams. In this way, a great amount of heat can be recovered leading to a reduced utilities consumption, hence, improving the plant economics. Using heat exchangers increases the capital costs, therefore, a trade-off between the utility costs and capital costs should be considered. The optimal design of a multiperiod heat exchanger network is to configure a heat recovery system that achieves the temperature targets of the different periods at the minimum total annual costs. This paper presents a framework for designing multiperiod HENs, so that the trade-off between energy costs and capital costs can be simultaneously optimized. The proposed technique depends on a two-stage strategy, in the first stage, a model is built then solved using mathematical programming for the specified design periods to obtain a feasible configuration that achieves the heating targets with minimum total annual cost possible. In the second stage, further reduction in the total annual cost is obtained by using a technique that reassigns the heat exchangers areas over the different periods so that no excessive heat transfer areas are overdesigned.

Last modified: 2020-09-30 16:45:33