Application of Ceramic Lattice Structures to Design Compact, High Temperature Heat Exchangers: Material and Architecture Selection

In this work, we report the design of ceramic lattices produced via additive manufacturing (AM) used to improve the overall performances of compact, high temperature heat exchangers (HXs). The lattice architecture was designed using a Kelvin cell, which provided the best compromise among effective thermal conductivity, specific surface area, dispersion coefficient and pressure loss, compared to other cell geometries. A material selection was performed considering the specific composition of the fluids and the operating temperatures of the HX, and Silicon Carbide (SiC) was identified as promising materials for the application. The 3D printing of a polymeric template combined with the replica method was chosen as the best manufacturing approach to produce SiC lattices. The heat transfer behaviour of various lattice configurations, based on the Kelvin cell, was determined through computational fluid dynamics (CFD). The results are used to discuss the application of such structures to compact high temperature HXs.

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Heat Transfer Problems in High Temperature Heat Exchangers

Proceeding of Advanced Course in High Temperature Equipment. ◽

10.1615/ichmt.1986.advcoursehightempeq.20 ◽

1986 ◽

Author(s):

Algirdas Zukauskas

Keyword(s):

Heat Transfer ◽

High Temperature ◽

Heat Exchangers ◽

Temperature Heat ◽

Transfer Problems

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Performance Optimization of Compact Ceramic High Temperature Heat Exchangers

Volume 3: Turbo Expo 2007 ◽

10.1115/gt2007-27888 ◽

2007 ◽

Author(s):

Q. Y. Chen ◽

M. Zeng ◽

D. H. Zhang ◽

Q. W. Wang

Keyword(s):

Heat Transfer ◽

High Temperature ◽

Heat Exchanger ◽

Performance Optimization ◽

Heat Exchangers ◽

Radiation Heat Transfer ◽

Surface Radiation ◽

Radiation Heat ◽

High Temperature Side ◽

Temperature Heat

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.

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Comprehensive analysis of transfer processes in modern high-temperature heat exchangers

Thermophysics and Thermal Power Engineering ◽

10.31472/ttpe.3.2019.4 ◽

2019 ◽

Vol 41 (3) ◽

pp. 26-32

Author(s):

B. Soroka ◽

V. Zgurskyi

Keyword(s):

Heat Transfer ◽

High Temperature ◽

Heat Exchangers ◽

Exchange Process ◽

Comprehensive Analysis ◽

Cfd Modeling ◽

Tube Heat Exchanger ◽

Transfer Processes ◽

Temperature Heat ◽

Heat Exchange Process

The CFD modeling of high-temperature tube heat exchanger has been carried out. The results of numerical analysis of internal and external secondary emitters’ (SEE) influence upon intensity and uniformity of resulting heat transfer have been presented and discussed. An internal SEE have the determining impact upon heat exchange process thus enhancing the resulting heat flux till extra 40%.

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