摘要
建立相变蓄热U型真空管太阳能集热器三维传热数值计算模型,研究工质流动时相变材料对U型真空管集热器热性能的影响,与无相变U型真空管集热器进行对比,探讨相变材料主要物性参数和工质质量流量对其热性能的影响规律。结果表明,在U型真空管集热器中填充相变材料可有效降低U型真空管集热器的出口温度峰值,相变材料在夜间及太阳辐射较弱时释放热量,延长了集热器的有效运行时间,相变集热器与传统无相变集热器的有效集热量相差较小。与无相变集热器相比,相变集热器出口温度峰值最大降低了10.6 K,有效运行时间延长了1.0~3.7 h。
A three-dimensional heat transfer model of U-pipe evacuated tube solar collector with phase change material(PCM)is established.The influence of PCM on the thermal performance of U-pipe evacuated tube collector is studied with working fluid flowing,the comparison of thermal performance of U-pipe evacuated tube collector with and without PCM is made,and the influence of the main physical parameters of PCM and the mass flow rate of working fluid on the thermal performance of solar collector is discussed.The results show that the peak outlet temperature of U-pipe evacuated tube collector is reduced effectively with PCM.Heat is discharged by PCM when solar radiation is weak and at night,and the operating time of solar collector is extended.The difference of effective heat gains of solar collector with and without PCM is very small.Compared to that of solar collector without PCM,the peak outlet temperature of the solar collector with PCM is reduced by 10.6 K,and the operating time is extended by 1-3.7 h.
作者
刘艳峰
李彤
李勇
陈耀文
王登甲
刘加平
Liu Yanfeng;Li Tong;Li Yong;Chen Yaowen;Wang Dengjia;Liu Jiaping(State Key Laboratory of Green Building in Western China,Xi’an 710055,China;School of Building Services Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2021年第7期244-250,共7页
Acta Energiae Solaris Sinica
基金
“十三五”国家重点研发计划(2016YFC0700400)
陕西省重点研发计划(2018ZDCXL-SF-03-01)
陕西省教育厅专项科研项目(18JK0471)
陕西省自然科学基金(2019JQ-768)
中国博士后科学基金面上项目(2016M602780)。
关键词
太阳能集热器
相变材料
数值模拟
热性能
U型真空管
solar collector
phase change material
numerical simulation
thermal property
U-pipe evacuated tube
