基于Matlab的槽式太阳能集热器二维传热模型效率分析

Efficiency Analysis of Two Dimensional Heat Transfer Model for Parabolic Trough Solar Collector Based on Matlab

槽式太阳能集热器是聚焦式太阳能热发电装置的关键部件.针对槽式太阳能集热器的传热过程,建立了二维稳态传热模型,利用Matlab软件中的fsolve函数对其进行了传热模拟并与LS-2型集热器的实验结果进行对比.结果表明:传热流体的模拟出口温度与实验出口温度最大相对误差为1.85%,说明采用fsolve函数计算过程稳定,结果精度较高.同时分析了太阳辐射强度、传热流体入口温度和室外风速变化对集热器效率的影响情况.分析表明,当太阳辐射强度升高及传热流体入口温度降低时,集热器效率增加;并且传热流体温度的变化对集热器效率的影响远大于太阳辐射强度变化对效率的影响,而室外风速变化对集热器效率的影响不大.

The parabolic trough solar collector is the key part of the concentrating solar power system.The two dimensional heat transfer model is established to simulate the heat transfer process of the parabolic trough solar collector.The model is simulated by using fsolve function of Matlab software,and the results are compared with the experimental results of LS-2 collector.The results show that the maximum relative error between the simulated outlet temperature and the outlet temperature is 1.85%,the calculation process of fsolve function is stable and the result is accurate.The influences of solar radiation intensity,heat transfer fluid inlet temperature and variation of outdoor wind speed on the performance of the parabolic trough solar collector are investigated.It is shown that the collector efficiency increases with the increase of solar radiation intensity or the decrease of the inlet temperature of the heat transfer fluid;the effect of the variation of heat transfer fluid inlet temperature on the collector efficiency is greater than that of the variation of solar radiation intensity,and the variation of outdoor wind speed has little influence on the collector efficiency.