先进太阳能热动力系统单元热管吸热器仿真分析

研究的目的是验证热管吸热器有良好的热性能。通过对先进太阳能热动力系统单元热管吸热器进行数值仿真,建立了相应的数学模型,给出了数值解法,并把仿真结果同NASA计算结果进行了对比。分析结果表明,热管吸热器由于热管良好的导热性和理想的等温性,热管在轴向的温差很小,这就使得热管在不同位置上的容器内的PCM都能同步、均匀的熔化;另外热管吸液芯的正常工作使得热管周向温度分布均匀,从而避免热斑现象;热管吸热器由于热管在轴向和周向上良好的等温性,在阴影期末,各蓄热容器内的PCM能够同时凝固,并最终达到完全凝固,从而避免热松脱现象。因此,热管吸热器提高了系统的效率,能避免热斑和热松脱现象。

Simulation and Analysis of Advanced Solar Dynamic System Cell Heat Pipe Receiver

In this paper,the study was to verify good thermal performance of heat pipe receiver.Cell heat pipe receiver of advanced solar dynamic system was numerically simulated.Accordingly,mathematical model was set up,numerical calculation method was offered,and calculation results were compared with those of NASA project.Analysis results show that heat pipe receiver which involves heat pipe owns the performance of perfect heat transfer and ideal identical temperature,the axial temperature difference of heat pipe is little,PCM canisters situated in different place of heat pipe can melt simultaneously and uniformly.At the same time,normal operation of wick ensures the uniformity of heat pipe circumference temperature,thus heat pipe receiver avoids phenomena of heat spot.In addition,heat pipe receiver has axial and radial performance of ideal identical temperature,all PCM canisters can freeze simultaneously at the end of eclipse,and freeze fully at last,so heat pipe receiver avoids heat ratcheting.Therefore,heat pipe receiver can improve the efficiency of system,avoid the phenomena of heat spot and thermal ratcheting.