8 - Analysis and Design of Heat Recovery Systems for Grassroots and Retrofit Situations

Abstract

This chapter builds on Chapters 2 and 4 and describes more advanced concepts, representations, procedures and graphical diagrams related to the analysis and design of heat recovery systems for both grassroots and retrofit situations. The grassroots case is extended to add more industrial realism, and to bring investment costs into the discussion. Key elements of the grassroots component are Multiple Utilities, Heat Transfer Area considerations, additional design tools beyond the Pinch Design Method, forbidden matches and an introduction to the use of optimisation for heat exchanger network design. Key elements of the retrofit part are procedures for Targeting, Design and Optimisation, where in all these stages focus is on maximum utilisation of existing equipment, making the task very different from the grassroots case. The Network Pinch concept will also be described, which as the name indicates is a feature of the Heat Exchanger Network (HEN), while the Heat Recovery Pinch is a feature of the stream data.