Experimental study on wind tunnel force measurement of flat roof Trough Condenser (FRTC). (August 2021)

• Record Type: Journal Article
• Authors: Zou, Qiong; Wang, Chao; Zeng, Xuan; Shan, Ming; Zhao, Yulong; Liu, Yichao; Tang, Haoyu
• Is Part Of: Solar energy. Volume 224(2021)
• Page Start: 1302
• Page End: 1312
• Publication Date: 2021-08
• Subjects: Flat roof -- Wind tunnel force measurement experiment -- Trough Condenser -- Wind (torque) coefficient; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2021.06.081
• Languages: English
• ISSNs: 0038-092X

Abstract

Highlights: The force experiment of flat roof Trough Concentrator model was carried out in the wind tunnel. The wind load coefficient of the flat roof Trough Concentrator varies with the vertical and horizontal wind azimuth angle. The resistance coefficient of flat roof is 67.39% smaller than that of ground. The most unfavorable conditions appear in the tilt angle of 10°, the horizontal wind azimuth angle of 45° and 315°. The conical vortex at the edge of the roof makes the wind coefficient between the roof and the ground different. Abstract: In this paper, the flat roof Trough Condenser (FRTC) model is studied using a wind tunnel high frequency dynamic force measurement experiment. The Trough Condenser's (TC) wind (torque) coefficients were obtained in six azimuths. The regularity and features of the wind coefficient when changing within a horizontal wind azimuth angle of 0°~360° and tilt angle of 0°~90° were analyzed. In addition, the TC on the flat roof and the TC installed on the ground were compared and analyzed. The results showed that the FRTC's resistance coefficient, lift coefficient and fundament tilting torque coefficient are all much greater than the side force coefficient, side torque coefficient and azimuth torque coefficient. When designing the TC's structure, the main consideration is the influence of resistance, fundament tilting torque and lift force. The maximal value of the resistance coefficient is 0.938, the maximal fundament tilting torque coefficient is 0.869, and the maximal value of the lift coefficient is −0.620. In addition, compared with the TC on the ground, the roof's resistance coefficient is 67.39% lower, the lift coefficient is 130.65% lower and the fundament tilting torque coefficient is 68.01% lower. Furthermore, as the wind field on the roof is different from that on the ground, while the height of the condenser is lower, and the parapet shields the condenser to a certain extent, the maximum wind (torque) coefficient is also different when under different working conditions. Finally, the effect of the cone vortex on the roof's edge also impacts these results.