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针对直通式微通道冷却的菲涅尔CPVT系统热特性,本文研究了太阳直射辐照度(DNI)、环境温度以及冷却水流速对其光热性能的影响,结果表明,热效率随冷却水流速的增大呈先增大后减小的趋势,且随着DNI的增大热效率逐渐升高,当DNI为1000 W/m~2,冷却水流速为0.27 m/s时,系统热效率可达到38.68%;同时对菲涅尔CPVT系统的输出性能进行了试验测试,结果表明:系统的实时电效率与DNI的变化趋势一致,热效率基本稳定在35%左右,未随DNI的改变产生较大波动。在不同冷却水流速条件下,对比数值模拟和试验结果,二者能较好吻合,为菲涅尔聚光CPVT系统的进一步研究及应用奠定了理论和试验基础。
In this paper, the effects of direct solar irradiance (DNI), ambient temperature and cooling water flow velocity on the photothermal performance of the Fresnel CPVT system with straight-through microchannel cooling are studied. The results show that the thermal efficiency increases with the cooling water flow rate When the DNI is 1000 W / m ~ 2 and the flow rate of cooling water is 0.27 m / s, the thermal efficiency of the system can reach 38.68%. With the increase of DNI, the thermal efficiency increases gradually. At the same time, the output performance of Fresnel CPVT system was tested. The results show that the real-time electrical efficiency of the system is consistent with that of DNI, and the thermal efficiency is basically stable at about 35%, which does not cause large fluctuations with the change of DNI. Under the condition of different cooling water velocities, the numerical simulation and experimental results are in good agreement with each other, which lays the theoretical and experimental foundation for the further research and application of Fresnel condenser CPVT system.