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Transport Phenomena in Thermal Engineering. Volume 2

ISBN:
1-56700-015-0 (Print)

HRSG DESIGN AND PERFORMANCE PREDICTION USING THE ε-NTU APPROACH

C.K. Cha
Foster Wheeler Energy Corporation, Clinton, NJ 08809, USA

F. D. Fitzgerald
Foster Wheeler Energy Corporation, Penyville Corporate Park, Clinton, NJ, USA 08809-4000

Abstract

In contrast to most of the other computer codes which employ the LMTD method, the Ε - NTU method is used in this code for sizing and for predicting the off-design performance of multi-pressure level HRSG (Heat Recovery Steam Generator) systems. The Ε-NTU approach has some advantages particularly in a performance calculation over the LMTD method. The Ε-NTU method is quite simple and straight-forward while the LMTD method involves successive approximation. Improvements in calculation stability, rate of convergence and accuracy of solution are discussed. The basic equations and solution strategy are presented.