Euler’s Theorem and Grand Composite Curves

Abstract

This chapter introduces and develops understanding of new concepts in heat exchanger design such as Euler’s network theorem, which is a useful technique to enable the planning and design of heat exchanger networks (HENs) that achieve maximum energy recovery objectives. The practice problems in this chapter help train the reader’s ability to identify heat load loops and analyze their implications on optimization objectives, for example how loops can be removed to minimize the excessive use of heat exchanger units, hence reducing capital costs.

An understanding of grand composite curves is also developed in this chapter, including how they can be applied to make useful conclusions that guide methods of heat recovery such as raising steam at various steam levels. This aspect goes hand in hand with overall HEN design and also builds on the earlier concepts of energy cascade and pinch analysis found in the previous chapter. The application of grand composite curves would facilitate optimal placement and design of utilities to achieve best energy efficiencies. Ideas of cost-benefit analysis present in this chapter will also help build an understanding of how heat integration ties in with overall process economics.