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2024 , Vol. 33 >Issue 1: 383 - 393

DOI: https://doi.org/10.1007/s11630-023-1891-y

Plastic Crystal Neopentyl Glycol/Multiwall Carbon Nanotubes Composites for Highly Efficient Barocaloric Refrigeration System

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  • 1. School of Energy & Environment, Southeast University, Nanjing 210096, China
    2. School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
    3. School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
    4. Birmingham Centre for Energy Storage, School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK

网络出版日期: 2024-01-16

基金资助

The research described in this work is supported by the Basic Research Program of Frontier Leading Technologies in Jiangsu Province (BK20202008), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX23_0240), the key research and demonstration projects of future low-carbon emission buildings (No. BE2022606), Hebei Natural Science Foundation (No. E2022210022), Science and Technology Project of Hebei Education Department (No. BJK2022056) and the Introduction Program of Oversea Talents of Hebei Province (No. C20220505).

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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Plastic Crystal Neopentyl Glycol/Multiwall Carbon Nanotubes Composites for Highly Efficient Barocaloric Refrigeration System

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  • 1. School of Energy & Environment, Southeast University, Nanjing 210096, China
    2. School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
    3. School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
    4. Birmingham Centre for Energy Storage, School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK

Online published: 2024-01-16

Supported by

The research described in this work is supported by the Basic Research Program of Frontier Leading Technologies in Jiangsu Province (BK20202008), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX23_0240), the key research and demonstration projects of future low-carbon emission buildings (No. BE2022606), Hebei Natural Science Foundation (No. E2022210022), Science and Technology Project of Hebei Education Department (No. BJK2022056) and the Introduction Program of Oversea Talents of Hebei Province (No. C20220505).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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摘要

塑性结晶新戊二醇（NPG）具有庞压卡效应。然而，它们的应用在几个方面受到限制，例如低导热系数、大热滞后和差回弹性能。在本研究中，选择了具有超高导热率和高机械强度的多壁碳纳米管（MWCNTs）来增强NPG的性能。最佳混合比例被确定为NPG与3wt%MWCNTs的复合材料，该复合材料在牺牲较少的相变焓的情况下能够将过冷度降低6K。随后，最佳配比的复合材料的综合性能与纯NPG进行了比较。在40 MPa的情况下，观察到390 J·K–1·kg–1的熵变化和9.9 K的温度变化。此外，所需的最小驱动压力降低了19.2%，以实现可逆的压热效应。此外，复合材料的热导率提高了约28%，显著缩短了压热制冷循环中的热交换时间。更为重要的是，超高的压力释放率使复合材料的回弹时间减少了73.7%，为恢复膨胀功提供了新的机会。

关键词： barocaloric refrigeration; neopentyl glycol; MWCNTs; performance enhancement

本文引用格式

DAI Zhaofeng, SHE Xiaohui, SHAO Bohan, YIN Ershuai, DING Yulong, LI Yongliang, ZHANG Xiaosong, ZHAO Dongliang . Plastic Crystal Neopentyl Glycol/Multiwall Carbon Nanotubes Composites for Highly Efficient Barocaloric Refrigeration System[J]. 热科学学报, 2024 , 33(1) : 383 -393 . DOI: 10.1007/s11630-023-1891-y

Abstract

Plastic crystal neopentyl glycol (NPG) exhibits colossal barocaloric effect with high entropy changes. However, their application is restricted in several aspects, such as low thermal conductivity, substantial supercooling effect, and poor springback properties. In this work, multi-walled carbon nanotubes (MWCNTs) with ultra-high thermal conductivity and high mechanical strength were selected for performance enhancement of NPG. The optimal mixing ratio was determined to be NPG with 3 wt% MWCNTs composites, which showed a 6 K reduction in supercooling without affecting the phase change enthalpy. Subsequently, comprehensive performance of the composites with optimal mixing ratio was compared with pure NPG. At 40 MPa, 390 J·K–1·kg–1 change in entropy and 9.9 K change in temperature were observed. Furthermore, the minimum driving pressure required to achieve reversible barocaloric effect was reduced by 19.2%. In addition, the thermal conductivity of the composite was increased by approximately 28%, significantly reducing the heat exchange time during a barocaloric refrigeration cycle. More importantly, ultra-high pressure release rate resulted in a 73.7% reduction in the springback time of the composites, offering new opportunities for the recovery of expansion work.

Key words： barocaloric refrigeration; neopentyl glycol; MWCNTs; performance enhancement

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