期刊
SOLAR ENERGY
卷 225, 期 -, 页码 33-43出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2021.07.013
关键词
Natural ventilation; Double-skin facade; Solar radiation; Renewable energy; CFD simulation; Louver
资金
- Australian Government through the Australian Research Council [DE200100892]
- Airlinx Heating & Cooling Supply Pty Ltd in Australia
- Australian Research Council [DE200100892] Funding Source: Australian Research Council
This study investigated the influence of operable outlet louvers on the natural ventilation performance of NVDSF, showing significant impacts that should not be ignored in practice. The results indicate that adjustable louvers can either promote or weaken natural airflow, depending on their opening angles, with empirical models developed to quantify the effects of typical solar conditions on ventilation performance.
Naturally ventilated double skin facade (NVDSF) absorbs solar radiation to introduce natural ventilation. It has been proved with significant importance in building energy-saving, and louvers on the NVDSF could be essential in real-life applications for the adjustment of uncomfortable flow. However, the impacts from this practical feature of adjustable louvers on the buoyancy-driven airflow are still not known. Motivated by this, this study addressed the influences of an operable outlet louver on the natural ventilation performance of an NVDSF, with louver angles of 30 degrees-150 degrees under various solar conditions (i.e., solar altitude angles within 10 degrees-80 degrees and direct incident solar radiation within 50-1,000 W/m2) for two types of glazing materials (i.e., regular and low-e glazing). A validated CFD model was used to solve the solar radiation and natural ventilation coupling problem between two semi-transparent facades. The results show that the outlet louvers' influences are significant and should not be ignored in practice. Compared to the no-louver case, upward-opening louvers (louver angles within 30 degrees-67.5 degrees in this study) can promote the ventilation - the optimal louver angle at 45 degrees can enhance the natural airflow by 10-14% for two types of glazings; whereas downward-opening louvers (112.5 degrees-150 degrees) will weaken the natural flow by 6-9% per increment of 10 degrees in louver angles. Empirical models were also developed to quantify the impacts of the typical solar conditions on natural ventilation performance. The obtained power-form functions between the ventilation rates and solar factors (altitude angle and incident radiation) show similarities between NVDSFs and solar chimneys.
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