Performance optimization of compact ceramic high temperature heat exchangers

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. Mu_S-G.R(with surface and gaseous radiation heat transfer) is averagely higher than Mu_No.R (without radiation heat transfer) by 7% and f_S-G.R is averagely higher than f_No.R by 5%. Mu_S-G.R(with surface and gaseous radiation heat transfer) is averagely higher than Nu_S.R (with only surface radiation heat transfer) by 0.8% and f_S-G.R is averagely higher than f_S.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.