双面受热太阳能平板接收器热性能模拟研究

Thermal Performance Simulation Study of Solar Double Heating Flat Plate Receiver

为提高太阳能光热转换效率,建立同轴非完整型平移抛物面聚光系统。分析双面受热平板接收器的能量传递及转换过程,采用热阻网络图的分析方法建立平板接收器的理论计算模型。利用MATLAB 7.0软件编制程序实现了平板接收器的热性能计算。在结构参数、环境参数和进口参数确定的情况下,当吸热板导热系数、厚度和吸热板表面发射率变化时,分析温度、能量及热性能的变化趋势。研究表明:导热系数和吸热板厚度达到一定数值,继续增加对于提高接收器的热性能基本没有太大意义;吸热板表面发射率对热性能影响显著,采用发射率为0.1的选择性涂层可实现能量最大转化;环境温度在0~30℃变化时,双面受热比单面受热的热效率提高了8.18%~37.01%。

To improve the conversion efficiency of solar energy,the coaxial nonholonomic translational parabolic focusing system is established.By analyzing the energy transfer and conversion course of the double-sided heating plate receiver,the thermal resistance network diagram is analyzed to form theoretical calculation model of flat plate receiver.MATLAB 7.0 software program is used to calculate the thermal performance of the plate receiver.When the structural parameters,environmental parameters and import parameters are determined,as the thermal conductivity of the heat absorber,the thickness and the emissivity of the surface of the heat absorber change separately,the variation trends of temperature,energy and thermal performance are analyzed.The results show that when the thermal conductivity and the thickness of the heat-absorbing plate reach certain values,further increases are of little significance for enhancing the thermal performance of the receiver.the emissivity of the surface of the heat absorption plate has a vital influence on the thermal performance,and the energy transformation can be maximized by the selective coating with the emissivity of 0.1.When The ambient temperature changes in 0~30 ℃,the thermal efficiency of double-sided heating is 8.18%~37.01% higher than that of single-sided heating.