Abstract
Heat exchanger network analysis, the key to improving economics by energy savings in many process industries, has been covered in this chapter. Option of saving hot and cold utility with alternate configurations for the same process has been discussed for a simple two-stream problem. A generalised approach to real life multi-stream problems is next introduced along with concepts of stream specification table, hot and cold composite curves for energy minimisation targeting and heat recovery pinch temperature. The concept of minimum temperature driving force (ΔTmin) and its optimum value is discussed and typical (ΔTmin) values used in industries are tabled. The pinch design is explained using graphical illustration and problem table algorithm. The design strategy is explained with stream matching rules and grid diagram representation. Complex cases with multiple utilities and threshold problems are covered. Utility pinch and grand composite curves are illustrated. A set of guidelines for data extraction is provided before the chapter ends with illustration problems.
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