Impacts of wind on solar chimney performance in a building. (15th October 2019)

• Record Type: Journal Article
• Authors: Shi, Long
• Is Part Of: Energy. Volume 185(2019)
• Page Start: 55
• Page End: 67
• Publication Date: 2019-10-15
• Subjects: Solar radiation -- Trombe wall -- Natural ventilation -- Building -- Wind impact -- Passive ventilation; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2019.07.056
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: The interaction between solar chimney and wind were investigated numerically and theoretically. A higher wind velocity does not represent a better performance, which depends on wind angle ( α ), which is the angle between wind direction and outward normal of the wall with the window. A windward situation (0°≤ α < 90°) is suggested, where the scenario with α = 0 shows the best performance. It is surprising that the leeward scenario with α = 180° presents a slightly positive effect, but scenarios with 90°≤ α < 180° show negative effects. Window area ( A w ) presents a positive effect on the airflow rate, which shows a linear relationship with A w 0.34 and A w 0.46 when the α is 0° and 45°, respectively. A theoretical model was developed to predict the airflow rate under α < 90°, where for 90°≤ α < 180° the related predictions can be based on the scenario without wind. The predictions are fitting quite well with numerical results. Critical wind velocity was also proposed to represent the wind velocity which overrules the performance that solar chimney is no longer dependent on solar radiation but wind. The critical wind velocity keeps increasing under higher solar radiation, where for the analysed model it increases from 0.65 to 1.55 m/s when solar radiation rises from 100 to 1300 W/m 2 . Highlights: Impacts of wind on solar chimney were investigated numerically and theoretically. Impacts of wind cannot be ignored during the practical designs of solar chimney. High wind velocity does not represent a better performance dependent on wind angle. A theoretical model was developed to predict the performance considering wind. Critical wind velocity was proposed for the velocity overruled the performance.