Ba (OH)2·8H2O composite phase-change material and its heat release characteristics in solar photovoltaic/photo-thermal collectors

doi:10.11949/j.issn.0438-1157.20161763

Abstract

Abstract:

A new barium hydroxide octahydrate composite phase-change material with melting point of 78℃ was developed, and its super cooling degree was reduced by 3-5℃ with the nucleating additive and its thermal conductivity can be enhanced by 11.7% combined with nanotechnology. Heat release characteristics of the new material were investigated on the experimental solar photovoltaic/photo-thermal (PV/T) collectors with cascade heat storage through paraffin wax, water and the new material. The system experimental results show that the new material has no super cooling and performs stable during phase-change. Under the circumstances that the water flow is 90 L·h^-1 and the environment temperature is 20℃, the solar collecting system can effectively store solar energy and water temperature can be maintained above 50℃ for more than 60 min, and meanwhile in the first 20 min, the outlet hot water temperature is above 70℃. Thus, the solar energy storage system can reduce the solar cell temperature, and at the same time meet the requirements of daily life.

Key words: phase-change material, super cooling, thermal conductivity, solar PV/T collector, cascade thermal storage

摘要：

开发了一种熔点为78℃的八水氢氧化钡复合相变材料，通过添加成核剂使复合相变材料的过冷度降低3~5℃，结合纳米技术使材料的热导率提高了11.7%。基于包含复合相变蓄热材料与石蜡、水蓄热的梯级蓄热太阳能光伏、光热集热器，对该新型材料的释热特性进行了实验，实验结果表明，八水氢氧化钡复合相变蓄热材料无过冷，在其相变温度上相变平稳。在水流量为90 L·h^-1，环境温度为20℃时，集热系统可以有效地储存太阳能，以50℃为参考点放热时间长达60 min以上，且在放水前20 min内，系统的出水温度都高于70℃，因此该系统能够在降低太阳电池工作温度的同时，满足日常生活需求。

关键词: 相变材料, 过冷, 热导率, 光伏/热集热器, 梯级蓄热

CLC Number:

TK02

JI Jun, LIU Yufei, REN Yinglei, HUA Weisan, ZHANG Xuelai. Ba (OH)₂·8H₂O composite phase-change material and its heat release characteristics in solar photovoltaic/photo-thermal collectors[J]. CIESC Journal, 2017, 68(8): 2985-2990.

纪珺, 刘宇飞, 任迎蕾, 华维三, 章学来. Ba(OH)₂·8H₂O复合相变材料及其在太阳能光伏/热集热器上的释热特性[J]. 化工学报, 2017, 68(8): 2985-2990.

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Ba (OH)₂·8H₂O composite phase-change material and its heat release characteristics in solar photovoltaic/photo-thermal collectors

Ba(OH)₂·8H₂O复合相变材料及其在太阳能光伏/热集热器上的释热特性

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