二元共晶相变材料热物性研究
The Study of Thermal Properties of Binary Eutectic Phase Change Materials
孙玮 1胡成志 1唐大伟1
作者信息
- 1. 大连理工大学能源与动力学院海洋能源利用与节能教育部重点实验室,大连 116024
- 折叠
摘要
二元共晶相变材料在储热及控温领域具有重要的应用价值,其过冷度在长期储能方面起到重要作用.本文基于CaCl2·6H2O和CaBr2·6H2O两种水合盐,合成了多组二元共晶相变材料,两种水合盐熔化温度分别为32.41℃和29.95℃,结晶温度分别为-3.42℃和12.52℃,对应的相变潜热为191 kJ·kg-1和115 kJ·kg-1.通过对合成的二元共晶相变材料进行热物性测试,结果表明二元共晶相变材料的可调节熔化温度为15.5～28.17℃,最高过冷度为26.02℃,其潜热值随CaCl2·6H2O含量的增加而增大.此外,添加增稠剂能够有效改善材料的过冷稳定性.本研究为低温长期储能领域提供了更多可选择的相变材料,也为调节相变材料的相变温度以及通过相变材料实现长期储能目标提供理论支撑.
Abstract
Binary eutectic phase change materials have important application value in the field of heat storage and temperature control,and their supercooling degree plays an important role in long-term energy storage.In this paper,based on two hydrated salts of CaCl2·6H2O and CaBr2·6H2O,multiple groups of binary eutectic phase change materials were synthesized.The melting temper-atures of the two hydrated salts were 32.41℃ and 29.95℃,and the crystallization temperatures were-3.42℃ and 12.52℃,respectively.And the corresponding latent heats of phase change are 191 kJ·kg-1 and 115 kJ·kg-1.The thermophysical properties of the synthesized binary eutectic phase change material were tested,and the results showed that the adjustable melting temperature of the binary eutectic phase change material was 15.5～28.17℃,the highest undercooling degree was 26.02℃,and its latent heat value increased with the increase of CaCl2·6H2O content.In addition,adding a thickener can effectively improve the supercooling stability of the material.This study provides more alternative phase change materials for the field of low-temperature long-term energy storage,and also provides theoretical support for adjusting the phase change temperature of phase change materials and achieving long-term energy storage goals through phase change materials.
关键词
相变材料/长期储热/二元共晶水合盐/过冷度/相变潜热Key words
phase change materials/long-term heat storage/binary eutectic hydrated salts/sub-cooling/latent heat of phase change引用本文复制引用
基金项目
国家自然科学基金(52176058)
国家自然科学基金(51806028)
出版年
2024
NETL
NSTL
万方数据