基于定形相变材料的相变砂浆热力学性能

王艳; 曾长女; 李皖皖; 孙立军

doi:10.3799/dqkx.2023.102

基于定形相变材料的相变砂浆热力学性能

doi: 10.3799/dqkx.2023.102

1.
中原工学院能源与环境学院, 河南郑州 450007
2.
河南工业大学土木工程学院, 河南郑州 450001
3.
中铁十四局集团有限公司, 山东济南 250101

基金项目:

河南省重点研发与推广专项科技攻关 212102110027

国家自然科学基金 31500394

2021年河南省高等教育教学改革研究与实践项目教研〔2021〕480号2021SJGLX146Y

详细信息

作者简介:
王艳（1979-），女，博士，副教授，主要从事废物资源化利用及生态系统元素循环等方面研究工作. E-mail：wyzzti@163.com

中图分类号: TK02
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- 被引次数: 0
出版历程
- 收稿日期: 2022-08-15
- 网络出版日期: 2024-01-03
- 刊出日期: 2023-12-25

Thermodynamic Performance of Phase Change Mortar Based on Shape-Stabilized Phase Change Material

1.
School of Energy and Environment Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China
2.
College of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China
3.
China Railway 14th Bureau Group Corporation Limited, Jinan 250101, China

摘要

摘要: 普通砂浆受温度差异影响时，常常会产生温度变形、温度应力和温度裂缝，而现有相变砂浆的低热导率易导致相变不充分、储能效率低等问题，导致其自我调温能力低，也难以更好地控制由温度引起的变形、应力及裂缝.采用石蜡基相变材料制备储能型砂浆，并通过优选导热增强剂的比表面积、厚度等材料物理参数，从材料本身来提高相变基体热导率和相变砂浆储能速率，从而提升其自调温性能.设计并搭建了材料热性能测试平台，测试相变砂浆的蓄热和热应变发展规律.结果表明，相变材料掺量30%的砂浆试块上表面温度比普通砂浆块温度降低9.7 ℃，热应变降低27.54%，表明该相变材料提高了蓄热能力并显著提升了砂浆的温度自调控性能.
- 相变储能砂浆 /
- 蓄热能力 /
- 热应变 /
- 力学性能
Abstract: Ordinary mortar often produces thermal deformation and cracks when it is applied. However, the low thermal conductivity of the existing phase change mortar easily leads to insufficient phase change and low energy storage efficiency, resulting in low thermal adaptability. Thus, it cannot effectively control the development of deformation, stress and fracture induced by temperature change. In this paper, paraffin-based phase change materials are used to prepare energy storage mortar, and by optimizing the three-dimensional microscopic parameters such as the specific surface area and thickness of the thermal conductivity enhancer, the focus is on improving the thermal conductivity of the phase change matrix and the energy storage rate of the phase change mortar, thereby improving its thermal adaptability. A thermal test platform was built to test its thermal performance including the energy storage and the thermal strain development with time. It is concluded that when the phase change matrix material was mixed with 30%, the surface temperature of the mortar block was lower by 9.7 ℃ than that of the ordinary mortar block, and the thermal strain was reduced by 27.54%, indicating that the phase change material improved the heat storage efficiency and significantly improved its thermal properties of self-controlled temperature.
- phase change energy storage mortar /
- heat storage capacity /
- thermal strain /
- mechanical property

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图 1 膨胀石墨微观结构

Fig. 1. Microstructure of expanded graphite

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图 2 材料蓄热性能试验示意

Fig. 2. Platform of thermal storage performance test

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图 3 材料热适应性能试验示意

Fig. 3. Platform of thermal adaptability test

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图 4 不同PCM掺量的相变砂浆导热系数

Fig. 4. Thermal conductivity of phase change mortar with PCM content

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图 5 不同PCM掺量相变砂浆上表面温升曲线

Fig. 5. The temperature rising curve of the upper surface of phase change mortar with PCM content

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图 6 不同PCM掺量对相变砂浆热应变发展影响

Fig. 6. Influence of different PCM contents on thermal strain development of phase change mortar

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图 7 不同PCM掺量相变砂浆抗压强度

Fig. 7. Compressive strength of phase change mortar with different PCM contents

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图 8 不同PCM掺量相变砂浆抗折强度

Fig. 8. Flexural strength of phase change mortar with PCM content

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图 9 相变砂浆的微观形貌

a.复合相变材料的SEM; b.相变砂浆的SEM

Fig. 9. Microscopic morphology of phase change mortar

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图 10 石蜡及复合相变材料的DSC曲线

Fig. 10. DSC curves of paraffin wax and composite phase change material

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图 11 不同PCM掺量相变砂浆DSC曲线

Fig. 11. DSC curve of phase change mortar with PCM contents

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表 1 相变砂浆配比(kg/m³)

Table 1. Mix proportions of phase change mortar (kg/m³)

材料	PCM-0	PCM-5	PCM-10	PCM-20	PCM-30
水泥	500	500	500	500	500
水	300	300	300	300	300
砂	1 427.58	1 359.60	1 297.80	1 189.65	1 098.14
PCM	0	19.06	36.39	66.71	111.89
W/C	0.6	0.6	0.6	0.6	0.6

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