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Processing of phase change materials by fused deposition modeling: Toward efficient thermal energy storage designs

Journal Article · · Journal of Energy Storage
 [1];  [1];  [2];  [1];  [3];  [1]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. TCPoly Inc., Atlanta, GA (United States)
  3. National Renewable Energy Laboratory (NREL), Golden, CO (United States); University of Texas at Dallas, Richardson, TX (United States)
We report that recently, several efforts have emerged that employ additive manufacturing techniques to integrate phase change material (PCM) thermal energy storage into geometrically complex designs for advanced thermal management. In this work, we contribute to this emerging research by reporting on the production of a composite nylon-based filament for fused deposition modeling incorporating encapsulated PCMs for 3D printing heat sink geometries. Microencapsulated PCM (MEPCM) with a 6 degrees C transition temperature was selected as the material for thermal energy storage. This transition temperature was selected due to its suitability to provide thermal energy storage to target air-conditioning applications in buildings. In an attempt to improve the thermal conductivity of the composite, fine boron nitride fillers were added, although the effect on improvement was found to be negligible in the overall composite mixture. The nylon-MEPCM ratio in the filaments was optimized, and filaments containing up to 40 wt% MEPCM were successfully synthesized, which were found optimal for 3D printing complex heat sink and other geometries. Thermal and mechanical properties of the filaments were characterized, including latent heat of fusion, thermal conductivity, phase change temperature, tensile strength, and more. Thermal infrared imaging of heat sink geometries printed using the MEPCM filaments undergoing thermal discharging was also conducted. This work presents the most promising result to date in the open literature for a 3D-printed PCM composite in the combination of size, energy density, and geometric complexity of printed parts.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1898002
Report Number(s):
NREL/JA-5500-82022; MainId:82795; UUID:f96ed6c4-7722-4bbe-a67f-3344e425a489; MainAdminID:67777
Journal Information:
Journal of Energy Storage, Journal Name: Journal of Energy Storage Journal Issue: Part B Vol. 55; ISSN 2352-152X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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