Total Site Targeting Accounting for Individual Process Heat Transfer Characteristics

This contribution presents an extended approach to Total Site targeting. Total Site integration offers the opportunity of maximising energy recovery between processes by reducing unnecessary fuel consumption and greenhouse gas emissions. Despite the methodology developments, how to deal with the minimum temperature differences is still an open question. This includes the overall selection of the Delta T-min values for Total Site Utility systems and how Delta T-min affects the design of the heat recovery networks of the individual processes. Specifying a single uniform Delta T-min for all processes integrated in the Total Site is not always optimum and could be too simplistic. This can lead to the underestimation of the overall site-wide heat recovery targets. The procedure proposed in this paper allows for estimating the heat recovery potential of Total Sites, which is closer to the reality. It is illustrated by a demonstration case study.