化工学报2025，Vol.76Issue(4)：1722-1730,封2,10.DOI:10.11949/0438-1157.20241139
太阳能直接吸收相变集-蓄热器的放热特性研究
Heat release performance of direct absorption/storage solar collector
摘要
Abstract
The phase change material(PCM)-based direct absorption/storage solar collector(DASSC)has the advantages of less heat transfer process,lower thermal energy loss,and higher photothermal conversion efficiency.The PCM exhibits limited light absorption capacity and low thermal conductivity,leading to significant temperature gradients and a low heat transfer rate in DASSC.Current research predominantly addresses the heat storage process in DASSC,with insufficient focus on the characteristics of the heat release process.To address this gap,a photo-thermal conversion shaped composite PCM(CPCM)is prepared using a melt blending method in conjunction with a vacuum adsorption technique.The DASSC is subsequently developed,leveraging the high absorption and substantial heat storage density properties of the CPCM.The light absorption and phase change characteristics of the CPCM are tested,and the effects of inlet temperature and Reynolds number of the heat transfer fluid on the heat release characteristics of the DASSC are investigated.The sensitivity and correlation of these two parameters on the heat release rate of DASSC are analyzed using the Morris method.The findings indicate that the absorbance of CPCM is 3.03 times that of pure PCM.Additionally,when the inlet temperature decreases from 16.0℃to 10.0℃,the average heat release rate of DASSC increases by 47.7%.As the Reynolds number increases from 2462 to 5628,the average heat release rate of the DASSC exhibits a 15.0%enhancement.The sensitivity and correlation of the inlet temperature on the heat release rate of the DASSC are significantly higher than those of the Reynolds number.The optimal value of the inlet temperature should be calculated separately in the design and optimization of the heat release performance of DASSC,while the Reynolds number can be directly determined based on the positive and negative correlation.关键词
相变/太阳能/热力学性质/光热转化/集-蓄热器Key words
phase change/solar energy/thermodynamic properties/photo-thermal conversion/storage solar collector分类
能源科技引用本文复制引用
刘淑丽,周文豪,张少良,沈永亮..太阳能直接吸收相变集-蓄热器的放热特性研究[J].化工学报,2025,76(4):1722-1730,封2,10.基金项目
国家自然科学基金项目(52178063,52406066) （52178063,52406066）
国家资助博士后研究人员计划项目(GZC20233388) （GZC20233388）
