optimaldesignofshell-and-tubeheatexchangerspdf.docVIP

Computers chem. Engng, Vol. 18, 5uppl., pp. 5295-5299, 1994 Printed in Great Britain. All rights reserved 0098-1354/94 $6.00+0.00 Copyright ? 1993 Pergamon Press Ltd OPTIMAL D]~SIGN OF SHELL-AND-TUBE HEAT EXCHANGERS M. REPPICH and J. KOHOUTEK Department of Process Engineering, Technical University of Brno, Technicka 2, 616 69 Brno, Czech Republic. Abstract A new method allowing the optimal design of baffled shell-and-tube heat exchangers will be dis? cussed in this paper. Tile known commercial design tools do not consist optimization strategies. There are presented as simplified expressions describing interaction between heat transfer and pressure drop that can he used for optimal design of heat exchangers from economic viewpoint. The developed program system HEATDESIGN is realizing a general computer-supported design on the basis of estimation of optimal pressure drops determined by consideration of economic conditions and process data. Examples show the influence of changed economic parameters or process data on the design and costs by means of optimization. In addition the program gives the possibility to optimize components of apparatus. Keywords Tubular heat exchanger; optimization; pressure drop. 1. Introduction Shell-and-tube heat exchangers are still numerously used in petrochemical and energy indus? tries because of their rElatively simple manufacture and their adaptability to different operating conditions. This heat f:xchauger type distinguishes itself by low pressure drops with high flow velocities. The design of shell-and-tube heat exchangers including thermodynamic and fluid dynamic design, strength calculations, cost estimation and optimization represents a complex process containing au integrated whole of design rules, calculating meth