槽式太阳能倒梯形腔体接收器热性能实验研究及㶲分析

Experimental study and analysis of thermal performance of trapezoidal cavity receiver for trough solar energy system

针对适用于槽式太阳能系统的倒梯形腔体接收器,通过实验测试了不同因素对系统热性能的影响,并基于热损失率、㶲效率及㶲系数等多指标进行综合评价。研究结果表明:在研究范围内,流量、传热工质温度、环境风速对热性能的影响较大。热损失率和㶲效率均随流量的增大而减小。工质入口温度达到363K时,热损失率达到最大值为57.11%;工质入口温度达到355.7K时,㶲效率达到最大值为8.43%;风速由0.8m/s增大至2.6m/s,热损失率增加了70.1%,㶲效率减小了16.5%。㶲系数受工质入口温度、流量的变化影响较为显著。

In this study,the thermal performance of the trapezoidal cavity receiver suitable for trough solar energy system was experimentally tested to investigate the influence of different factors on the system performance.Comprehensive evaluation was conducted based on multiple indicators such as heat loss rate,thermal efficiency,and heat transfer coefficient.The results showed that the flow rate,heat transfer fluid temperature,and environmental wind speed had a significant impact on the thermal performance within the studied range.Both heat loss rate and thermal efficiency decreased with the increase of flow rate.The maximum heat loss rate of 57.11%was achieved when the heat transfer fluid inlet temperature reached 363 K,whereas the maximum thermal efficiency of 8.43%was achieved when the heat transfer fluid inlet temperature reached 355.7 K.When the wind speed increased from 0.8 m/s to 2.6 m/s,the heat loss rate increased by 70.1%,and the thermal efficiency decreased by 16.5%.The heat transfer coefficient was significantly affected by the changes in the heat transfer fluid inlet temperature and flow rate.