摘要
基于螺旋式微通道冷却的菲涅尔聚光PV/T系统性能进行研究,分析太阳直射辐照度（DNI,G）、冷却水流速及入射角对其热电性能的影响。结果表明,增大冷却水流速可提高PV/T系统的光电转换效率,但当流速大于某一值后,系统光电转换效率基本保持不变;光热转换效率随流速的增大呈先增后减的趋势,且随着G的增大光热转换效率逐渐升高,当G为1000 W/m^2,冷却水流速为3.8 m/s时,系统光热转换效率可达43%;当G在200-1000 W/m^2范围时,光电光热综合效率最大值为79.55%,DNI对其影响较小;入射角的增大对系统能量转化与利用均产生不利影响,为保证系统高效运行入射角应控制在0.3°以内;同时,对菲涅尔聚光PV/T系统的输出性能进行试验测试,结果表明,呼和浩特冬季一日内,系统峰值功率13.89 W出现在G最大时,但光电转换效率最大值26%出现在G突降时刻。
The performance research of Fresnel concentrating PV/T system based on spiral microchannel cooling wascarried out,and the effect of the direct solar irradiance（DNI,G）,flow rate of cooling water and incidence angle on thethermoelectric performance of the system was analyzed. The results show that the photoelectric conversion efficiency ofPV/T system can be raised with the increase of flow rate of cooling water,but the photoelectric conversion efficiency ofthe system will mainly maintain constant when the flow rate is beyond certain value. The photothermal conversionefficiency of the system increases firstly and then decreases with the increases of the flow rate,and the photothermalconversion efficiency of the system rises gradually with the increase of G,when G is 1000 W/m^2,the flow rate of coolingwater is 3.8 m/s,the photothermal conversion efficiency of the system can reach up to 43%. The maximum value of theoverall photothermal and photovoltaic efficiencies is 79.55% when G is in range from 200 W/m^2 to 1000 W/m^2,the effectof DNI on efficiency is less. The increase of the incident angle has an adverse effect on the energy conversion andutilization of the system,the incident angle has to be less than 0.3° to ensure the operation with higher efficiency.Meanwhile,the output performance of the Fresnel concentrating PV/T systems was also tested and the results show thatduring one day of the winter in Hohhot,the system peak power of 13.89 W appears at maximum of G,but maximumphotoelectric conversion efficiency of 26% occurs at the sudden drop time of G.
作者
闫素英
李彦洁
田瑞
王峰
王胜捷
Yan Suying;Li Yanjie;Tian Rui;Wang Feng;Wang Shengjie(College of Energy and Power and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;Wind and Solar Energy Utilization Technology Laboratory at the Provincial Ministry of Education, Hohhot 010051, China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2018年第6期1552-1558,共7页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51766012)
内蒙古自然科学基金(2015MS0542)
内蒙古科技计划(2016)
关键词
菲涅尔聚光
CPV/T系统
砷化镓
太阳电池
热电转换效率
Fresnel concentrating system
CPV/T system
GaAs
solar cells
thermoelectric energy conversion
