Modeling and Parametric Study of a Ceramic High Temperature Heat Exchanger and Chemical Decomposer

Abstract

It is proposed to use ceramic high temperature heat exchanger as a sulfuric acid decomposer for hydrogen production within the sulfur iodine thermo-chemical cycle. The decomposer is manufactured using fused ceramic layers that allow creation of channels with dimensions below one millimeter. A three-dimensional computational model is developed to investigate the fluid flow, heat transfer, stresses and chemical reactions in the decomposer. Fluid, thermal and chemical reaction analyses are performed using FLUENT software. Temperature distribution in the solid is imported to ANSYS software and used together with pressure as the load for stress analysis. Results of this research can be used as a basis for investigation optimal design of the decomposer that can provide maximum chemical decomposition performance while maintaining stresses within design limits.

Design, Fabrication, and Testing of Ceramic Plate-Type Heat Exchangers with Integrated Flow Channel Design

“…The increased fracture toughness would be desirable and is possible by using longer fibers in combination with the adjustment of a weak fiber–matrix interface. An appropriate interphase concept has been already reported by embedding the fibers into a soft carbon matrix, which protects the fibers against the silicon attack during the final MI process 16 . Such improvements to the microstructure are technically feasible by modifying the compounds and by adapting the net shape molding process.…”

“…An appropriate interphase concept has been already reported by embedding the fibers into a soft carbon matrix, which protects the fibers against the silicon attack during the final MI process. 16 Such improvements to the microstructure are technically feasible by modifying the compounds and by adapting the net shape molding process. Microstructures with reduced density gradients are required, especially in the fin areas.…”

“…The viability of several different HX designs with varying complexities are currently being explored 16–18 . The plate HX with small flow channels provides a good approach for constructing a ceramic IHX because high‐power density can be obtained.…”

“…The viability of several different HX designs with varying complexities are currently being explored. [16][17][18] The plate HX with small flow channels provides a good approach for constructing a ceramic IHX because highpower density can be obtained. The off-set fin plate design enables a very large heat transfer area density and an effective counter current flow.…”

Laser Beam Machining, Laser Beam Hybrid Machining, and Micro-channels Applications and Fabrication Techniques

“…42 and 43. High-temperature and compact micro heat exchangers can be manufactured using ceramic tape technology which uses fused ceramic layers to create channels with dimensions below 1 mm [200]. Metal-based microchannel heat exchangers are also of current interest because of the combination of high heat transfer performance and improved mechanical integrity [201].…”