Abstract

This article addresses the problem of heat-exchanger network design. The design of such systems can no longer be done in isolation from consideration of alternative means of energy conservation, and most importantly, from consideration of how the design of the heat recovery system interacts and impinges on the design of the core of the process and the utility system.

This article gives details on the economics of heat recovery: how to determine the energy demand; how to determine approximate capital cost; how to identify economic heat recovery level. The Pinch Design Method is discussed as a means to determine these economic factors. This method is discussed in detail from the basic principles to a worked example and shortcomings of the method are described. Systematic problem decomposition is one way to overcome the shortcomings. Many software packages are available to implement Pinch technology, but the reader is urged to develop a basic understanding of the principles of the technology and use this in combination with engineering judgement. Finally a practical design application is detailed.