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Performance Optimization of Compact Ceramic High Temperature Heat Exchangers

[+] Author Affiliations
Q. Y. Chen, M. Zeng, D. H. Zhang, Q. W. Wang

Xi’an Jiaotong University, Xi’an, Shaanxi, China

Paper No. GT2007-27888, pp. 983-993; 11 pages
doi:10.1115/GT2007-27888
From:
  • ASME Turbo Expo 2007: Power for Land, Sea, and Air
  • Volume 3: Turbo Expo 2007
  • Montreal, Canada, May 14–17, 2007
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4792-6 | eISBN: 0-7918-3796-3
  • Copyright © 2007 by ASME

abstract

In the present paper, the compact ceramic high temperature heat exchangers with parallel offset strip fins and inclined strip fins (inclined angle β = 0∼70°) are investigated with CFD method. The numerical simulations are carried out for high temperature (1500°C), without and with radiation heat transfer, and the periodic boundary is used in transverse direction. The fluid of high temperature side is the standard flue gas. The material of heat exchanger is SiC. NuS-G.R (with surface and gaseous radiation heat transfer) is averagely higher than NuNo.R (without radiation heat transfer) by 7% and fS-G.R is averagely higher than fNo.R by 5%. NuS-G.R (with surface and gaseous radiation heat transfer) is averagely higher than NuS.R (with only surface radiation heat transfer) by 0.8% and fS-G.R is averagely higher than fS.R by 3%. The thermal properties have significantly influence on the heat transfer and pressure drop characteristics, respectively. The heat transfer performance of the ceramic heat exchanger with inclined fins (β = 30°) is the best.

Copyright © 2007 by ASME

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