Executive Summary Heat Exchanger Network Retrofit The retrofit of heat exchanger networks (HEN) is a complicated process to design and implement. Several solutions to the retrofit problem have been suggested. This paper will compare two specific approaches and evaluate the most effective and useful methodology. Also, this paper will attempt to improve process pinch technology by incorporating optimization software and other techniques. Mixed Integer Linear Programming The Mixed Integer Linear Programming (MILP) methodology allows the user to tailor the program for very specific scenarios. This is beneficial for the retrofit application because industrial retrofit problems are numerous and varied. The MILP maintains the intricateness of the retrofit problem by not making any of the classical simplifying assumptions. Another benefit of the MILP is the ability to easily change the objective function, which allows the user to optimize a variety of cost functions. Process Pinch
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