Enhancement of air-side heat transfer performance of additively manufactured condensers

This report outlines the investigation of Triply Periodic Minimal Surface (TPMS) designs for enhanced air-side performance novel air-cooled heat condensers. Four types of TPMS, Schwarz-Primitive, Schwarz-Diamond, Schoen-Gyroid, and Schoen-IWP, were produced by “MS Lattice” software and they were num...

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Main Author: Chan, Yi Qing
Other Authors: Leong Kai Choong
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2024
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Online Access:https://hdl.handle.net/10356/177515
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spelling sg-ntu-dr.10356-1775152024-05-30T07:16:22Z Enhancement of air-side heat transfer performance of additively manufactured condensers Chan, Yi Qing Leong Kai Choong Wong Teck Neng School of Mechanical and Aerospace Engineering MKCLEONG@ntu.edu.sg, MTNWONG@ntu.edu.sg Engineering Mechanical engineering This report outlines the investigation of Triply Periodic Minimal Surface (TPMS) designs for enhanced air-side performance novel air-cooled heat condensers. Four types of TPMS, Schwarz-Primitive, Schwarz-Diamond, Schoen-Gyroid, and Schoen-IWP, were produced by “MS Lattice” software and they were numerically investigated using “Ansys Fluent” software. In this study, the thermal performance of 70% and 80% porosity TPMS and Modified Primitive 1 and 2, which were designed by previous Final Year Project students, were investigated. Simulation tests were conducted to obtain the effective thermal conductivity ( ), the heat transfer coefficients, and the pressure drop per unit depth (∆P /H) of each structure. The numerical results showed that structures with 70% porosity have a higher than structures with 80% porosity where Schwarz-Diamond - 80% porosity has the highest of 20.8585 W/m·K while Modified Primitive 1 (80% porosity) has the lowest keff of 9.2337 W/m·K. Modified Primitive 1 (80% porosity) has a lower ∆P HHPthan Modified Primitive 2 (70% porosity) while the heat transfer coefficient comparison for both Modified Primitive structures depends on the boundary conditions applied in the simulations. Modified Primitive 1 has a higher heat transfer coefficient when isothermal conditions were applied to the top and bottom of the structures and a lower heat transfer coefficient when constant heat flux condition was applied to the bottom of the structures. To experimentally investigate these structures, samples of 90 mm long, 40 mm wide, and 15 mm high with a 3.5 mm thickness base were fabricated using additive manufacturing (AM) technology which is a selective laser melting (SLM) technique. Experiments were conducted on all ten samples using the mini wind tunnel setup with a centralised air compressor in Singapore Centre for 3D Printing (SC3DP). The experimental results have shown that Schwarz-Primitive - 80% porosity has the highest ∆P HH of 0.0226 kPa/mm and Modified Primitive 1 has the lowest ∆ HHPof 0.0096 kPa/mm at 2.5 m/s. Schwarz-Diamond - 70% porosity has the highest heat transfer coefficient of 1358.5 W/m2·K and the highest Nusselt number (Nu) of 1125.3 at 2.5 m/s. However, it also has a very high ∆ HH of 0.0204 kPa/mm. Bachelor's degree 2024-05-30T07:16:22Z 2024-05-30T07:16:22Z 2024 Final Year Project (FYP) Chan, Y. Q. (2024). Enhancement of air-side heat transfer performance of additively manufactured condensers. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/177515 https://hdl.handle.net/10356/177515 en application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Mechanical engineering
spellingShingle Engineering
Mechanical engineering
Chan, Yi Qing
Enhancement of air-side heat transfer performance of additively manufactured condensers
description This report outlines the investigation of Triply Periodic Minimal Surface (TPMS) designs for enhanced air-side performance novel air-cooled heat condensers. Four types of TPMS, Schwarz-Primitive, Schwarz-Diamond, Schoen-Gyroid, and Schoen-IWP, were produced by “MS Lattice” software and they were numerically investigated using “Ansys Fluent” software. In this study, the thermal performance of 70% and 80% porosity TPMS and Modified Primitive 1 and 2, which were designed by previous Final Year Project students, were investigated. Simulation tests were conducted to obtain the effective thermal conductivity ( ), the heat transfer coefficients, and the pressure drop per unit depth (∆P /H) of each structure. The numerical results showed that structures with 70% porosity have a higher than structures with 80% porosity where Schwarz-Diamond - 80% porosity has the highest of 20.8585 W/m·K while Modified Primitive 1 (80% porosity) has the lowest keff of 9.2337 W/m·K. Modified Primitive 1 (80% porosity) has a lower ∆P HHPthan Modified Primitive 2 (70% porosity) while the heat transfer coefficient comparison for both Modified Primitive structures depends on the boundary conditions applied in the simulations. Modified Primitive 1 has a higher heat transfer coefficient when isothermal conditions were applied to the top and bottom of the structures and a lower heat transfer coefficient when constant heat flux condition was applied to the bottom of the structures. To experimentally investigate these structures, samples of 90 mm long, 40 mm wide, and 15 mm high with a 3.5 mm thickness base were fabricated using additive manufacturing (AM) technology which is a selective laser melting (SLM) technique. Experiments were conducted on all ten samples using the mini wind tunnel setup with a centralised air compressor in Singapore Centre for 3D Printing (SC3DP). The experimental results have shown that Schwarz-Primitive - 80% porosity has the highest ∆P HH of 0.0226 kPa/mm and Modified Primitive 1 has the lowest ∆ HHPof 0.0096 kPa/mm at 2.5 m/s. Schwarz-Diamond - 70% porosity has the highest heat transfer coefficient of 1358.5 W/m2·K and the highest Nusselt number (Nu) of 1125.3 at 2.5 m/s. However, it also has a very high ∆ HH of 0.0204 kPa/mm.
author2 Leong Kai Choong
author_facet Leong Kai Choong
Chan, Yi Qing
format Final Year Project
author Chan, Yi Qing
author_sort Chan, Yi Qing
title Enhancement of air-side heat transfer performance of additively manufactured condensers
title_short Enhancement of air-side heat transfer performance of additively manufactured condensers
title_full Enhancement of air-side heat transfer performance of additively manufactured condensers
title_fullStr Enhancement of air-side heat transfer performance of additively manufactured condensers
title_full_unstemmed Enhancement of air-side heat transfer performance of additively manufactured condensers
title_sort enhancement of air-side heat transfer performance of additively manufactured condensers
publisher Nanyang Technological University
publishDate 2024
url https://hdl.handle.net/10356/177515
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