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Solar Chimney Applications in Buildings
A solar chimney is a renewable energy system used to enhance the natural ventilation in a building based on solar and wind energy. It is one of the most representative solar-assisted passive ventilation systems attached to the building envelope. It performs exceptionally in enhancing natural ventilation and improving thermal comfort under certain climate conditions. The ventilation enhancement of solar chimneys has been widely studied numerically and experimentally. The assessment of solar chimney systems based on buoyancy ventilation relies heavily on the natural environment, experimental environment, and performance prediction methods, bringing great difficulties to quantitative analysis and parameterization research. With the increase in volume and complexity of modern building structures, current studies of solar chimneys have not yet obtained a unified design strategy and corresponding guidance. Meanwhile, combining a solar chimney with other passive ventilation systems has attracted much attention. The solar chimney-based integrated passive-assisted ventilation systems prolong the service life of an independent system and strengthen the ventilation ability for indoor cooling and heating. However, the progress is still slow regarding expanded applications and related research of solar chimneys in large volume and multi-layer buildings, and contradictory conclusions appear due to the inherent complexity of the system.
1. Introduction to Solar Chimneys
2. Current Research Methods of the Solar Chimney
3. Influencing Factors of Solar Chimney Performance
4. Works Have Been Done at RMIT University, Australia
5. Potential Trends and Challenges of the Solar Chimney
6. Discussion and Conclusions
|Performance||Air Temperature Adjustment (°C)||Volumetric/Mass Flow Rate (m3/s, m3/h, or kg/s)||Air Change per Hour (ACH)||Energy-Saving Percentage (%)||Indoor Relative Humidity (%)|
|Stand-alone Solar chimney||Drop 1.0–5 °C ; 16.7 °C ||50–374 m3/h ; 0.019–0.033 m3/s ; 0.55–44.44 kg/s ; 70.6 m3/h~1887.6 m3/h ;||0.16–15 ; 27.11 ; 30 ;||12–50% |
|Integrated systems based on solar chimneys||Drop: 2.0–14 °C with water spaying ; 6.7–11.5 °C with evaporative cooling ; 3.2–9 °C with EAHE ; 5.2 °C with windcatcher ; 10–13 °C with a windcatcher and EAHE ; 8 °C with a Trombe wall and water spraying system ; with ; Raises: 14 °C with Trombe wall and PV ; 6.4 °C with EAHE .||1.4 kg/s with wind tower ; 0.0184 m3/s with EAHE ; 0.038–0.144 m3/s or 130.5 m3/h or 414 m3/h with evaporative cooling ||35–73 with a wind tower ; 12 with PV ; 2.42–4.33 with evaporative cooling ; 9 with windcatcher ||50% with a windcatcher and EAHE ; 75–90% with windcatcher ||Increases 17% with Trombe wall and water spraying system ; increases 28–45% |
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