为提高太阳能烟囱集热系统（SCHCS）效率,提出在集热棚入口增设透明挡板优化设计方案。采用三维数值模拟结合离散纵坐标（DO）辐射模型、太阳光线追踪对集热棚入口无挡板、一层挡板、两层挡板3种模型对比研究。采用相同模型尺寸的SCHCS试验结果验证仿真结果正确性。对比分析3种模型对SCHCS温度、速度、压力、熵产、集热效率性能参数影响结果,选取更合适的集热棚优化设计。结果表明：与无挡板集热棚入口相比,改变集热棚入口设计可提高SCHCS温度场、压力场、速度场的均匀性。与一层挡板相比,两层挡板更好地改善了系统温度、压力、速度均匀性。太阳辐照度为200 W/m2时,两层挡板的集热效率比无挡板和一层挡板分别高8.49%、22.85%;太阳辐照度为1000 W/m2时,两层挡板的集热效率比无挡板和一层挡板分别高9.71%、13.05%。
Abstract
In order to improve the efficiency of solar chimney heat collection system （SCHCS）, an optimized design scheme of adding transparent baffle at the entrance of collector was proposed. Three-dimensional numerical simulation combined with discrete ordinate （DO） radiation model and solar ray tracing were used to make a comparative study on the three models of without baffle, with one baffle and with two baffles at the entrance of collector. SCHCS such as test results with the same model size were used to verify the correctness of the simulation results. The effects of the three models on SCHCS temperature, speed, pressure, entropy production and heat collection efficiency were compared and analyzed, and a more appropriateoptimal design of heat collection shed was selected. The results show that the uniformity of temperature field, pressure field and velocity field of SCHCS can be improved by changing the design of collector entrance compared with no baffle. Compared with one baffle, two baffles can better improve the uniformity of temperature, pressure and velocity of the system. When the solar radiation is 200 W/m2, the heat collection efficiency of two-layer baffle is 8.49% and 22.85% higher than that of non-baffle and one-layer baffle respectively. When the solar radiation is 1000 W/m2, the heat collection efficiency of two-layer baffle is 9.71% and 13.05% higher than that of non-baffle and one-layer baffle respectively.
关键词
太阳能烟囱 /
集热系统 /
结构优化 /
集热效率
Key words
solar chimney /
heat collecting system /
structural optimization /
heat collection efficiency
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基金
内蒙古自然基金（2021LHMS05007）; 风能太阳能利用技术教育部重点实验室开放基金（2019-2021); 内蒙古工业大学博士基金（BS201933）; 内蒙古自治区重大专项（2019ZD0014）
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