槽式太阳能新型腔式吸热器的热性能研究
THERMAL PERFORMANCE OF SOLAR TROUGH SYSTEM WITH A NOVEL CAVITY RECEIVER
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摘要: 提出一种适用于抛物槽集热器的新型太阳能腔式吸热器,该装置具有较高的集热效率,同时连接安装和日常运行维护也相对便利。对其建立一套三维传热模型,并搭建采用新型腔式吸热器的抛物槽集热器实验系统,通过实验测试对比吸热器瞬时效率,验证模型的准确性。此外,定量分析不同环境参数与工作参数对新型腔式吸热器热性能的影响,结果表明:集热效率随着法向直接日射辐照度、环境温度的升高而增加,随着环境风速和吸热器入口传热流体温度的升高而降低,而受传热流体质量流量的影响较小。Abstract: A novel cavity receiver is proposed for parabolic trough collectors. The heat-collecting efficiency of it is high,and it is simple to connect and operate and maintain. In this study,a three-dimensional heat transfer model of the novel cavity receiver is built for simulation. And an actual system of the parabolic trough collector with the novel cavity receiver is built for experiments. By comparing the receiver’s instantaneous efficiency in the simulation and in the experiments,the accuracy of the model is verified. In addition,the thermal performance of the novel cavity receiver in different environment parameters and working parameters is quantitatively analyzed.The results showed that heat-collecting efficiency increases with the increase of normal direct solar irradiance and ambient temperature,decreases with the increase of ambient wind velocity and inlet fluid temperature,and is less affected by mass flow rate of the heat transfer fluid.
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