新型扁盒肋片式太阳能集热器的数值模拟与实验研究*
Numerical simulation and experimental test of a novel compact solar collector with internally extruded pin-fin flow channel
摘要：
建立了扁盒肋片式集热器的CFD模型，对集热器内部流体的流动与换热进行了数值模拟。搭建了太阳能光伏光热实验系统，进行了冬季实验测试。模拟结果与实验结果较吻合，验证了模型的可靠性。结果显示：出口温度随入口流量的增大呈曲线形下降，每小时集热量呈线性增长，流速为0.5～0.6 m/s时，温度衰减率为10%左右，每小时集热量增加率为12%左右；出口温度和每小时集热量均随热源温度的升高呈线性升高和增大，整体增长33.33%左右；温度分布呈双曲线形，圆柱肋片处产生对称涡旋；冬季工况下，实测PV/T系统发电效率在10%以下，集热效率为12%左右，水箱温度为25 ℃左右。
Abstract：
Establishes a CFD model of flat box finned collector, and numerically simulates the fluid flow and heat transfer inner the collector. Builds a solar photovoltaic/thermal experimental system and carries out the winter experimental test. The simulation results are consistent with the experimental results, which verifies the reliability of the model. The results show that the outlet temperature decreases in a curve with the increase of the inlet flow, and the heat collection per hour increases linearly. When the flow velocity ranges from 0.5 m/s to 0.6 m/s, the temperature attenuation rate is about 10%, and the heat collection per hour increases about 12%. Both the outlet temperature and the heat collection per hour increase linearly with the increase of the heat source temperature, and the overall growth rate is about 33.33%. The temperature distribution is hyperbolic, and symmetrical vortices are generated at the cylindrical ribs. Under winter working conditions, the power generation efficiency of the PV/T system is less than 10%, the heat collection efficiency is about 12%, and the temperature of the water tank is about 25 ℃.
Keywords:flat box finned solar collector, solar photovoltaic/thermal system, heat collection, outlet temperature, plate core temperature