中文摘要：

针对120℃以下低温太阳能光热发电中存在光照强度会随时间变化的问题，在搭建的太阳能光热和有机物朗肯循环（ORC）发电实验台上，研究集热器性能随光照强度的变化规律，分析光照强度变化对ORC发电系统性能的影响。实验结果表明：整个系统光电转换效率可达2．2％，热电效率可达4．5％，热电效率和发电功率受光照强度降低影响较大；当光照强度小幅降低时，集热器有效吸热量降低，导热液温度降低，ORC热电效率与发电功率降低且幅度较大，膨胀机转速、膨胀比虽降低但幅度较小；当光照强度大幅降低时，系统性能降低剧烈，需通过减少工质流量，才可使系统继续稳定工作。

英文摘要：

In view of the problem that the radiation intensity changing with time in low temperature （〈120℃ ） solar thermal power generation, a solar organic Rankine cycle power generation experiment was built up. The change regularity of performance of solar collector with radiation intensity was studied. The influence of the change of radiation intensity on the performance of ORC power generation system was analyzed. The experimental results show that the photoelectric efficiency and thermoelectric efficiency of the whole system reach up to 2.2% and 4.5%, respectively. The thermoelectric efficiency and power are greatly influenced by the decline of radiation intensity. When available absorbed heat of collector and heat transfer fluid temperature decreases with a low range decrease of radiation intensity, ORC thermoelectric efficiency and power decrease with a higher range. However, the speed and expansion ratio of expander decrease with a lower range. When heat transfer fluid decreases with a high range decrease of radiation intensity, the mass flow rate of working fluid needs to become less to keep power generation system stable.