辐照强度对太阳能集热-辐射制冷复合系统热性能影响的研究

Study of the influence of solar irradiation intensity on thermal performance of solar heating-radiative cooling system

文章针对一种太阳能集热-辐射制冷(solar heating-radiative cooling,SHRC)复合系统,结合典型气象年数据,研究了太阳辐照强度变化对系统热效率η和总热损失系数UL的影响规律;建立了SHRC复合系统的物理模型,模拟了不同辐照强度下的系统热效率,与实验结果的均方根误差为3.97%;在此基础上对6个不同典型气候类型代表城市的全年太阳能集热性能进行了对比分析。结果表明,全年得热量最多和最少的地区分别为亚热带季风气候的堪培拉(4048.73MJ/m^2)和温带大陆性气候的纽约(2791.34MJ/m^2)。研究结果有利于综合评估和比较不同气候类型地区全年SHRC复合系统热性能,进一步对系统性能较差的季节或地区提出了改进措施。

The influence of solar irradiation intensity on thermal efficiency(η) and overall thermal loss coefficient( U L) of an integrated system of diurnal solar heating and nocturnal radiative cooling,i.e. solar heating-radiative cooling(SHRC) system,is studied based on typical meteorological year data. The physical model of SHRC system is established and the thermal efficiency under different levels of solar irradiation intensity is simulated. The root-mean-square error with the experimental results is 3.97%. On this basis,the annual solar thermal performance of six representative cities with typical climates is compared. Results show that the regions of maximum and minimum annual heat gains are Canberra with subtropical monsoon climate(4 048.73 MJ/m ^2) and New York with temperate continental climate(2 791.34 MJ/m ^2),respectively. The results are beneficial to comprehensively evaluate and compare the annual thermal performance of SHRC system in different regions. Some improvement measures for the periods or regions of poor thermal performance are put forward as well.