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Performance Analysis and Optimal Design of Heat Exchangers Used in a High Temperature and High Pressure System

[+] Author Affiliations
Byoung Ik Choi, Kui Soon Kim, Man Yeong Ha, Ji Hwan Jeong

Pusan National University, Busan, South Korea

Jong Rae Cho

Korea Maritime University, Busan, South Korea

Torbjorn Lindquist, Philip P. Walsh

Rolls-Royce Strategic Research Centre, Derby, England, UK

Paper No. GT2008-50511, pp. 501-507; 7 pages
doi:10.1115/GT2008-50511
From:
  • ASME Turbo Expo 2008: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Berlin, Germany, June 9–13, 2008
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4314-7 | eISBN: 0-7918-3824-2
  • Copyright © 2008 by ASME

abstract

A computational study for the optimal design of heat exchangers used in a high temperature and high pressure system is presented. Two types of air to air heat exchangers are considered in this study. One is a single-pass cross-flow type with straight plain tubes and the other is a two-pass cross-counter flow type with plain U-tubes. These two types of heat exchangers have the staggered arrangement of tubes. The design models are formulated using the number of transfer units (ε-NTU method) and optimized using a genetic algorithm. In order to design compact light weight heat exchangers with the minimum pressure loss and the maximum heat exchange rate, the weight of heat exchanger core is chosen as the object function. Dimensions and tube pitch ratio of a heat exchanger are used as design variables. Demanded performance such as the pressure loss (ΔP) and the temperature drop (ΔP) are used as constraints. The performance of heat exchangers is discussed and their optimal designs are presented with an investigation of the effect of design variables and constraints.

Copyright © 2008 by ASME

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