Numerical simulation of solar collector efficiency for experimental model of unpowered ventilation system in long highway tunnel(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年06期
- Page:
- 78-82
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Numerical simulation of solar collector efficiency for experimental model of unpowered ventilation system in long highway tunnel
- Author(s):
- LIU Ning; ZHANG Sun-xiao; QU Chang-jie
- 1. Xi’an Civil Engineering Design Academy of Chang’an University Co. Ltd., Xi’an 710064, Shaanxi, China; 2. School of Civil Engineering, Chang,an University, Xi,an 710061, Shaanxi, China
- Keywords:
- tunnel engineering; unpowered ventilation system; numerical simulation; solar air collector system; heat collection efficiency
- PACS:
- U453.5
- DOI:
- -
- Abstract:
- In order to reveal the characteristics of strengthening effect of solar air tube heat collector on natural ventilation system of tunnel, a model of intensified heat collection test for unpowered ventilation system in long highway tunnel to comprehensively use solar and wind energy was designed. The FLUENT software of computational fluid dynamics (CFD) was used to simulate the temperature field in the solar air tube collector system of the experimental model. The solar radiation intensity was treated as the boundary condition. Temperature distribution of the cross section of the collector tube, the temperature difference between inlet and outlet and heat collection efficiency of the system under different radiation intensity and ventilation rate was analyzed. The results show that the temperature difference between inlet and outlet of the collector increases with the increase of solar radiation intensity and the heat collection efficiency basically remains unchanged under the condition that total air volume is constant. The temperature difference between inlet and outlet of solar collector decreases with the increase of total air volume, and the heat collection efficiency increases with the increase of the total volume under the same solar radiation intensity and environmental condition. Solar collector has an obvious strengthening effect on the natural ventilation of long highway tunnel. But in actual application, it is necessary to make a balance between heat collection efficiency and ventilation volume. The overall performance of system also needs to be assessed comprehensively.
Last Update: 2017-12-18