太阳能热气流发电系统的性能分析

基于太阳能热气流发电系统的原理,分析了系统的发电功率和能量转换效率.数学模型的建立考虑了太阳辐射和系统尺寸参数对系统最大输出功率和最大能量转换效率的影响.以西班牙试验电站系统为例进行了数值模拟,数值计算结果与理论分析具有良好的一致性.系统最大输出功率不仅是烟囱高度的函数,同时也与系统其他尺寸和环境参数有关;在太阳辐射强度为1000W/m2条件下,当烟囱高度为300m时,系统的最大能量转换效率达到1%,当烟囱高度为1000m时,系统的最大能量转换效率可超过3%.

Analysis of the performance of the solar chimney power plant systems

Based on the principle of the solar chimney power plant systems, analysis on the output power and the energy Conversion efficiency of the systems has been presented. The effects of the solar radiation and various geometry parameters influence on the maximum power output and maximum efficiency of the system have been considered to develop the mathematical model. With the solar chimney prototype in Spain as an example, the numerical simulation results show good agreement with the theoretical analysis. The maximum power output is a function of not only the chimney height, but also the other geometric dimensions and the environment parameters as well. If the solar radiation is 1 000 W/m^2, the energy conversion efficiency will reach 1%, when the chimney height reaches 300 m, and it will surpass 3 percent when the chimney height reaches 1 000 m.