熱交換網路的設計早已經被視為一種減少化工程序公用流體使用量的有效方法。傳統上，我們的設計目標為最小單一操作條件下的總年成本(TAC)。但在多時期操作化工程序中，我們還需額外的研究議題。實體而言，雖然熱交換網路中含有相同匹配的數目但在不同時期所需要的熱交換面積是不同的。過去，沒有任何研究針對此一問題提出解決方案。所以在這篇論文中，我們提出一個改良的數學模式並配合經驗法則來產生考慮設備共用的多時間熱交換網路工程設計。最後也用幾個案例來說明上述建議的可行性與效益。

Heat exchange network (HEN) design has been considered as an effective approach to reduce the utility consumption rates in industrial processes. Yee and Grossmann, (1990) and Yee et al., (1990) stated that traditionally, the design objective is to minimize the total annual cost. However, it is often necessary to consider additional implementation issues in multi-period chemical processes as reported by Tantimuratha et al., (2001); and Aaltola, (2002). Specifically, Chen et al.,(2005); Ma et al., (2008); and Fraser et al., (2010) reported that the same match in a HEN may require different heat-transfer areas in different periods. None of the reported studies provided any guideline to produce proper exchanger designs that can handle the heat duties in all periods. In this thesis, a modified mathematical model and equipment sharing heuristics have been developed to generate suitable simple engineering designs for the heat exchangers in a multi-period HEN. Several case studies are presented in this thesis to demonstrate the feasibility and benefits of the proposed procedure.

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