Optimization of Micro-Channel Features in a Ceramic Heat Exchanger

2007 ◽  
Author(s):  
Merrill A. Wilson ◽  
Charles Lewinsohn ◽  
James Cutts ◽  
Yitung Chen ◽  
Valery Ponyavin
Keyword(s):  
Heat Exchanger ◽  
Micro Channel ◽  
Cross Sectional ◽  
Flow Paths ◽  
Pressure Drops ◽  
Microchannel Heat Exchanger ◽  
Empirical Performance ◽  
Overall Performance ◽  
Chemical Cycle ◽  
Validation Testing

It has been proposed that compact ceramic heat exchangers can be used for high temperature, corrosive applications. This paper discusses the development and optimization of a microchannel heat exchanger for the decomposition of sulfuric acid as part of the hydrogen producing sulfur iodine thermo-chemical cycle. The optimization process combines thermal-hydraulic and structural modeling (UNLV) with empirical performance and validation testing (Ceramatec, Inc.). Within the designs investigated, the micro-channel features were varied to adjust the cross-sectional profiles and the “tortuosity” of the serpentine flow paths to increase the thermal performance while maintaining low pressure drops and thermo-mechanical stresses within system. The results of these coupled optimization efforts and the associated overall performance improvement will be reported.

Dynamic Flow of Micro-Channels in a Ceramic Heat Exchanger

2006 ◽  
Author(s):  
James Cutts ◽  
Merrill Wilson ◽  
Valery Ponyavin
Keyword(s):  
Heat Exchanger ◽  
Cross Sections ◽  
Dynamic Pressure ◽  
Dynamic Flow ◽  
Flow Paths ◽  
Baseline Design ◽  
Pressure Drops ◽  
Micro Channels ◽  
Temperature Heat ◽  
Chemical Cycle

This poster presents a comparison of flow between four possible designs for ceramic high temperature heat exchanger that is used as a sulfuric acid decomposer which may be used for hydrogen production within the sulfur iodine thermo-chemical cycle. The decomposer is manufactured using fused ceramic layers that allow creation of tailored micro-channels with dimensions below one millimeter. The baseline design uses parallel straight channels with rectangular cross sections. This design will be compared with other proposed designs where varying cross sections and serpentine flow paths can improve the heat transfer with minimal effects on the pressure drop. Measurements have been taken using a dynamic pressure mat that has been calibrated to allow for precise measurements of the flow data. Results of this research are used as a basis for investigation optimal design of the decomposer that can provide maximum thermal performance while maintaining low pressure drops and thermo-mechanical stresses within system.

Thermo-Mechanical Design of a High-Temperature Silicon Carbide Micro-Channel Heat Exchanger

2003 ◽  
Author(s):  
Merrill A. Wilson ◽  
Steven M. Quist
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Mechanical Design ◽  
Mechanical Degradation ◽  
Micro Channel ◽  
Power Cycles ◽  
Microchannel Heat Exchanger ◽  
Operating Environments

Efficiency and emissions of advanced gas turbine power cycles can be improved by incorporating high-temperature ceramic heat exchangers (see Figure 1). In cooperation with the DOE, preliminary development and testing of SiC based structures has been completed. This program has focused on four initial areas: thermo-mechanical degradation as a function of the chemical operating environments, design of a layered microchannel heat exchanger, thermo-mechanical testing and analysis of these structures, and fabrication development through rapid prototyping techniques.

Design of a Ceramic Heat Exchanger for Sulfuric Acid Decomposition

2006 ◽  
Author(s):  
Merrill A. Wilson ◽  
Charles Lewinsohn ◽  
James Cutts ◽  
Valery Ponyavin
Keyword(s):  
Heat Transfer ◽  
Sulfuric Acid ◽  
High Temperature ◽  
Heat Exchanger ◽  
Ceramic Materials ◽  
Compact Heat Exchanger ◽  
Micro Channel ◽  
Micro Channels ◽  
Macro Scale ◽  
Chemical Cycle

It has been proposed that compact ceramic heat exchangers can be used for high temperature, corrosive applications. This paper discusses the design development of a micro-channel heat exchanger for the decomposition of sulfuric acid as part of the hydrogen producing sulfur iodine thermo-chemical cycle. Corrosion studies of candidate materials indicate that ceramic materials have superior corrosion and creep resistance under these high temperature, high acid concentration environments. This compact heat exchanger utilizes micro-channels to enhance the heat transfer while maintaining low pressure drops within the system. Through modular stacking of these micro-channel networks, a "shell and plate" configuration enables the processing of commercial-scale processes. The ceramic materials provide for long-life applications. The design of the micro-channel features captures the enhanced heat transfer characteristics at the micro-scale; the modular assembly permits the integration into macro-scale processes. As a case study, the thermal performance and the economics were investigated to determine the feasibility of this compact heat exchanger for the hydrogen producing sulfur iodine thermo-chemical cycle. The results of this design effort with its associated performance goals and development status will be reported.

scholarly journals Effect of Dimensionless Number (KN and RE) on Performance Index of Concentric Circular Micro Channel

2020 ◽  
Vol 8 (10S2) ◽  
pp. 41-54
Keyword(s):  
Reynolds Number ◽  
Heat Exchanger ◽  
Knudsen Number ◽  
Slip Flow ◽  
Dimensionless Number ◽  
Micro Channel ◽  
Cfd Analysis ◽  
Counter Flow ◽  
Overall Performance ◽  
Transfer Properties

Overall performance of any type of heat channel is largely depends upon Knudsen number and Reynolds number [1]. In present work the outcome of dimensionless number on heat transfer properties of micro channel heat exchanger [2]are investigated. CFD analysis of counter flowmicro channel was performed for both slip and no slip flow using Fluent as CFD code. Based on results obtain, pressure drop increases with increment in Reynolds number and Knudsen number. The effectiveness reduces with increment in Reynolds number. The comparison of thermal and hydrodynamics performance between slip and no slip flow for heat exchanger is investigated. The effectiveness increases with decreasing values of Reynolds number for counter flow. For higher effectiveness of the micro channel heat exchanger, Reynolds number should be less.

THERMAL PERFORMANCE OF GRAPHENE OXIDE NANOFLUID IN MICROCHANNEL HEAT EXCHANGER

2020 ◽  
Vol 27 (5) ◽  
pp. 439-461
Author(s):  
Yue Seong Ong ◽  
Ku Zilati Ku Shaari ◽  
Afiq Mohd Laziz ◽  
Inn Leon Lu ◽  
Mohamad Fakhrul Ridhwan Samsudin ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Heat Exchanger ◽  
Thermal Performance ◽  
Microchannel Heat Exchanger
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