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【Applied Energy最新原创论文】一种用于户外热管理的新型高发射、低导热柔性相变复合材料

AEii国际应用能源  · 公众号  ·  · 2023-08-20 18:30

正文

原文信息:

Novel flexible phase change materials with high emissivity, low thermal conductivity and mechanically robust for thermal management in outdoor environment

原文链接:

https://www.sciencedirect.com/science/article/pii/S0306261923009200

Highlights

(1) The flexible materials combining radiative sky cooling and PCM are prepared.

(2) The materials have high emissivity, high enthalpy and low thermal conductivity.

(3) The cooling capability of materials is successfully tested.

(4) The materials are suitable for tents, car covers and other outdoor applications.

摘要

由于大量的能源消耗和温室气体排放,全球变暖加剧,夏季高温将成为常态。高温环境会严重威胁户外工作者的身体健康。迫切需要采用新技术来降低工人在极热环境下的热应力问题。本文将相变材料(PCM)与辐射天空冷却技术相结合,成功制备了一种新型柔性复合相变材料(CPCM),该材料由石蜡(PW)、聚丙烯中空纤维(PP纤维)和热塑性弹性体(SEBS)组成。与传统的封端技术相比,熔融的SEBS可以简单经济地封闭纤维端部。新型CPCM的焓值高达180.01J/g,导热系数低至0.26 W/ (m·K),减少了热量从外部向内部的传递。CPCM抗拉强度为3.89MPa,可承受的最大力可达147N,疏水性试验接触角为114.8°,为新材料在户外环境中的广泛应用提供了保障。此外,光学测试显示其发射率(大气窗口)为0.955,极高的发射率有利于材料在夜间的辐射冷却。晴天时,CPCM与环境的平均温差为6.403℃,最大温差为13.414℃。在帐篷的模拟实验中,当外界温度达到60℃时,有CPCM比无CPCM的帐篷表面温度低约22℃。

Abstr act

High summer temperatures will become the norm as global warming intensifies due to massive energy consumption and greenhouse gas emissions. High-temperature environments will seriously threaten the health of outdoor workers. It is urgent to adopt new technologies to solve the problem of reducing the thermal stress of workers in an extremely hot environment. Herein, phase change material (PCM) and radiative sky cooling technology were combined and prepared successfully a new kind of flexible composite phase change material (CPCM) with paraffin wax (PW), polypropylene hollow fiber (PP fiber) and Linear styrene-b-(ethylene-co-butylene)-b-styrene triblock copolymer with 30 wt% styrene (SEBS). Compared with the traditional end sealing technology, the melted SEBS can close the end of the fiber easily and cost-effectively. The novel material (10PP) has a high enthalpy of 180.01J/g, and the thermal conductivity is as low as 0.26 W/ (m· K), the low thermal conductivity of CPCM reduces the transfer of heat from the outside to the inside. Tensile strength is 3.89MPa, the maximum force that 10PP can withstand reaches 147 N, and the contact angle for the hydrophobicity test is 114.8°, which provides a guarantee for the wide application of the new material in an outdoor environment. Besides, the optical test shows an emissivity (atmospheric window) of 0.955, and the extremely high emissivity facilitates radiative cooling of the material at night. On a clear day, the average temperature difference and maximum temperature difference between 10PP and the environment are 6.403°C and 13.414°C respectively. In the simulation experiment of the tent, when the external temperature reaches 60°C, the surface temperature of the tent with CPCM is about 22°C lower than that without CPCM. This inspiring work offers a great contribution to flexible passive cooling materials for outdoor applications.

Keywords

Phase change material

High enthalpy

Low thermal conductivity

Mechanical property

Hydrophobicity

High emissivity

Graphics


Graphical abstract.

Fig. 2. Profile based on the proposed vector representation (purple line) and real energy consumption profile (red line).

Fig. 5. (a) Load-Displacement curve; (b) Stress-Strain curve; (c) Water contact angles of 10PP; (d) Bend the 0PP; (e)Bend the 10PP; (f) Bend the 15PP.

Fig. 9. (a) Photos of the tent and materials attached to the tent; (b) Thermal imaging photos of tents with and without materials at 26 °C; (c) Thermal imaging photos of tents with and without materials at 30 °C; (d) Thermal imaging photos of tents with and without materials at 40 °C; (e) Thermal imaging photos of tents with and without materials at 50 °C; (f) Thermal imaging photos of tents with and without materials at 60 °C.







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