Induced flow for ventilation and cooling by a solar chimney |
| |
| Affiliation: | 1. Mechanical Engineering Dept., University of Technology, Baghdad, Iraq;2. Electromechanical Eng. Dept., University of Technology, Baghdad, Iraq;1. College of Civil Engineering, Hunan University, Changsha, Hunan 410082, China;2. College of Engineering, Hunan Agricultural University, Changsha, Hunan 410128, China;1. Civil and Infrastructure Engineering Discipline, School of Engineering, RMIT University, GPO Box 2476, Melbourne, VIC, 3001, Australia;2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, 230026, PR China;3. Department of Urban Planning, School of Urban Design, Wuhan University, 430072, PR China;4. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, PR China;5. Department of Building, National University of Singapore, Singapore, 117566, Singapore;1. Energy Resources Engineering Department, Egypt-Japan University of Science and Technology, Alexandria, Egypt;2. Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, Tokyo, Japan;1. Faculty of Architecture and Planning (Building Technology), Thammasat University, 99 Mu 18 Klongluang, Patumthani, Thailand;2. Center of Excellence in Electromagnetic Energy Utilization in Engineering (CEEE), Department of Mechanical Engineering, Thammasat University, 99 Mu 18 Klongluang, Patumthani, Thailand |
| |
| Abstract: | An experimental and numerical model of a solar chimney was proposed in order to predict its performance under varying geometrical features in Iraqi environmental conditions. Steady, two dimensional, turbulent flow was developed by natural convection inside an inclined solar chimney. This flow was investigated numerically at inclination angles 15° to 60°, solar heat flux 150–750 W/m2 and chimney thickness (50, 100 and 150) mm. The experimental study was conducted using a single solar chimney installed on the roof of a single room with a volume of 12 m3. The chimney was 2 m long; 2 m wide has three gap thicknesses namely: 50, 100 and 150 mm. The performance of the solar chimney was evaluated by measuring the temperature of its glass cover, the absorbing wall and the temperature and velocity of induced air. The results of numerical model showed that; the optimum chimney inclination angle was 60° to obtain the maximum rate of ventilation. At this inclination angle, the rate of ventilation was about 20% higher than 45°. Highest rate of ventilation induced with the help of solar energy was found to be 30 air changes per hour in a room of 12 m3 volumes, at a solar radiation of 750 W/m2, inclined surface angle of 60°, aspect ratio of 13.3 and chimney length of 2 m. The maximum air velocity was 0.8 m/s for a radiation intensity of 750 W/m2 at an air gap of 50 mm thickness. No reverse air flow circulation was observed even at the largest gap of 150 mm. The induced air stream by solar chimney can be used for ventilation and cooling in a natural way (passive), without any mechanical assistance. |
| |
| Keywords: | Solar chimney Computational fluid dynamics Natural ventilation Flow rate |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
