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3D Printing a Tortuous Network for Use as a Heat Exchanger

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Title: 3D Printing a Tortuous Network for Use as a Heat Exchanger

Authors: John P. Chandler IV, Joseph J. Thalakkottor, N. Krishnan P. Veluswamy , Davin Kahler, Orian Welling , and David R. Salem

DOI: 10.33599/nasampe/c.24.0342

Abstract: 3D printed tortuous networks have convenient properties to be used to efficiently heat fresh air for enclosed spaces in cold environments as a cost-effective HVAC solution. This is done by drawing outside air with a negative interior pressure through a network of microchannels in a heated panel which conducts heat into the incoming air. This study discusses the optimization of the channel tortuosity and diameter of a 3D printed panel for use as a heat exchanger. 3D printing these panels is an ideal solution due to its ability to create complex internal geometries. This was done by first creating a model of a micro channel network that can vary the channel tortuosity and diameter. Next, the efficiency of the vascular heat exchangers was evaluated using multiphysics simulation software. Lastly, the results of the simulations were verified by manufacturing a series of vascular panels and performing physical tests using the same boundary conditions. The vascular heat exchangers were evaluated using then Effectiveness-Number of Transfer Units (ε-NTU) which quantifies the efficiency of a heat exchanger by comparing the actual heat transfer and the theoretical maximum heat transfer. The vascular heat exchangers were manufactured using a stereolithography (SLA) 3D printer.

References: [1] American Society of Heating Refrigerating and Air-Conditioning Engineers, ASHRAE Standard: Standards for Natural and Mechanical Ventilation, 2022. [2] Ghalandari, M., Irandoost Shahrestani, M., Maleki, A., Safdari Shadloo, M., & El Haj Assad, M. Applications of intelligent methods in various types of heat exchangers: A Review. Journal of Thermal Analysis and Calorimetry, 2021 [3] Taylor, B. J., & Imbabi, M. S. Environmental design using dynamic insulation. Transactions- American Society of Heating Refrigerating and Air Conditioning Engineers, 2000 [4] Craig, S., & Grinham, J. Breathing walls: The design of porous materials for heat exchange and decentralized ventilation. Energy and Buildings, 2017 [5] Ghanbarian, B., Hunt, A. G., Ewing, R. P., & Sahimi, M. (2013). Tortuosity in porous media: A critical review. Soil Science Society of America Journal, 2013 [6] Prabhanjan, D. G., Raghavan, G. S. V., & Rennie, T. J. Comparison of heat transfer rates between a straight tube heat exchanger and a helically coiled heat exchanger. International communications in heat and mass transfer, 2002 [7] White, F. M. Fluid Mechanics. Singapore: McGraw-Hill Education, 2016

Conference: CAMX 2024 | San Diego CA

Publication Date: 2024/9/9

SKU: TP24-0000000342

Pages: 10

Price: $20.00

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