Performance comparison of compound parabolic concentrating solar air device with embedded star multi-fins receiver
Aiming at the defects of gap light leakage and surface heat transfer in the use of a glass vacuum tube,in this paper,the glass tube embedded star multi-fins receiver is used as the concentrating photothermal conversion component of compound parabolic concentrating solar air device,and the air is selected as the heat transfer medium to alleviate the above defects and reduce the sealing requirements of the device and the low temperature'burst tube'rate.The influence of the fin shape of the star-shaped multi-fins receiver on the performance of the compound parabolic concentrating solar air device was comparative studied.The influence of different star-shaped multi-fins receiver on the optical performance of the device was simulated and calculated.Based on this,the thermal properties of the device with embedded star six-fins receiver and the star five-fins receiver were tested and analyzed under actual weather conditions.The results show that when α＜7.4°,the optical performance of the solar air collector device with star six-fins receiver is better than that of the star five-fins receiver.The average light receiving rate and concentrating efficiency of the former are 98.2%and 76.4%respectively,which are 1.2%and 1.1%higher than those of the latter.In the sunny day,when the air flow rate is 4.0 m/s,the average outlet temperature,maximum instantaneous heat collection and photothermal conversion efficiency of the solar air collector embedded with the star six-fins receiver are 37.0℃,896.45 W and 75.31%,respectively,which are 1.37%,2.80%and 1.93%higher than that of the embedded star five-fins receiver.The testing results can provide a reference for the structural optimization design of the receiver of the compound parabolic concentrating solar air device.
万方数据
维普
