Thermal enhancement of hollow-Core 3DP through nozzle design customization

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies Pub Date : 2025-02-13 DOI:10.1016/j.susmat.2025.e01273

Nik Eftekhar Olivo, Valeria Piccioni, Francesco Milano, Fabio Gramazio, Matthias Kohler, Arno Schlueter, Benjamin Dillenburger

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引用次数: 0

Abstract

On the architectural scale, material extrusion (ME) or Big Area Additive Manufacturing (BAAM) have been fabrication methods for polymer-based components explored as an alternative to injection molding, over the past 20 years. These Additive Manufacturing (AM) techniques face long printing hours, slow material cooling rates, and high material usage when scaling towards building-size components. Hollow-core 3D printing (HC3DP) is an novel fabrication method that addresses these limitations by extruding tubular beads, thereby saving time and materials. A key advantage of HC3DP is its insulating properties due to the air chambers within the prints. This technique has significant potential for large-scale facade fabrication while providing essential thermal insulation.

However, initial research indicates that deploying HC3DP at an architectural scale, while meeting building insulation standards, requires using a double pane with an internal infill structure. This reduces its ability to optimize time and material efficiency. The full potential of this technology rather relies on its application for the fabrication of single-pane mono-material façade elements. Therefore, as a first step, this research aims to explore the different insulating properties of various HC wall configurations from more complex to infill-less wall typologies. As a second step, thermally optimized bespoke die-end extrusion nozzles are designed for HC3DP of façade panels to achieve higher material, time, and thermal efficiency.

Through bespoke nozzle customization, different levels of thermal insulation improvement could be achieved, reaching an U-Value of 0.998 W/m2K on a HC3DP single-pane panel, improving by two the insulating capacity of basic single pane circular-sectioned HC, and complying with the nearly zero-energy building (NZEB) standards (1). All of this while reducing printing time, material usage and cost up to half compared to an insulating-equivalent HC3DP wall typology.

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来源期刊

Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment

CiteScore

13.40

自引率

4.20%

发文量

158

审稿时长

45 days

期刊介绍： Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.