Improving the performance of solar chimney by addressing the designing factors

2018 4th International Conference on Renewable Energy Technologies

Zhang, Guomin^1 ; Shi, Long^1

Civil and Infrastructure Engineering Discipline, School of Engineering, RMIT University, Melbourne

VIC

3030, Australia^1

关键词: Absorptivities;    Engineering applications;    Heat absorption;    Inclination angles;    Large openings;    Natural ventilation;    Reliable systems;    Technical guides;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/168/1/012010/pdf
DOI  :  10.1088/1755-1315/168/1/012010

来源: IOP

【 摘 要 】

Solar chimney is a reliable system totally based on solar energy to enhance natural ventilation in buildings, but challenge still exists to optimize its performance with the lowest cost. In this study, three designing factors, including configuration, installation conditions, and material usages, were reviewed to provide a technical guide for engineering applications. Regarding the configuration, the performance of solar chimney can be enhanced with a high cavity, an appropriate cavity gap (usually 0.2-0.3 m), equivalent inlet and outlet area, and height/gap ratio of 10-15. Regarding installation conditions, an optimum inclination angle of 45° was usually suggested, and large openings can enhance the performance while the increasing rate keeps decreasing. The principles of material usage are to maximum the heat absorption and reduce the heat losses, considering properties such as thermal conductivity, absorptivity, emissivity, transmissvity, and reflectivity.