Global optimization of heat exchanger networks using a new generalized superstructure

• We extend the general HEN superstructure proposed by Floudas et al., 1986.
• we compare two different reformulations, and we solve the problem globally.
• We introduce a new feature to RYSIA, the global optimizer we developed recently, called lifting partitioning.
• Among results, we obtain structures that cannot be obtained using other models (stages, etc.).

We present an extension of a previously presented superstructure (Floudas et al., 1986) for heat exchanger network grassroots design. This extension is such that it includes several matches between two streams, activates splitting control and allows for mixing temperature control. We solve this model globally using RYSIA, a recently developed method bound contraction procedure (Faria and Bagajewicz, 2011a, Faria and Bagajewicz, 2011b, Faria and Bagajewicz, 2011c and Faria et al., 2015). We also add a new RYSIA feature called Lifting Partitioning. Results show structures that cannot be obtained using the stages model (Yee and Grossmann, 1990) or other similar restrictive models.