دورية أكاديمية
Theoretical analysis and numerical study of natural convection inside combined solar chimney
| العنوان: | Theoretical analysis and numerical study of natural convection inside combined solar chimney |
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| المؤلفون: | Huimin Cui, Mengjiao Han, Jitao Zhang, Zhiming Han, Feng Xu, Qingkuan Liu |
| المصدر: | Energy Science & Engineering, Vol 12, Iss 5, Pp 2052-2071 (2024) |
| بيانات النشر: | Wiley, 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Technology LCC:Science |
| مصطلحات موضوعية: | combined solar chimney, heat transfer, natural ventilation, Rayleigh number, scaling analysis, turbulent thermal boundary layer, Technology, Science |
| الوصف: | Abstract Solar chimneys may induce natural ventilation through solar radiation. However, sufficient theoretical studies are needed as a basis to fully exploit passive design in practical green building design. In this work, we investigate the heat transfer properties of turbulent natural convective flows in a combined solar chimney with a thermal flux at the absorption wall by means of theoretical analysis and numerical simulations. Two different flow patterns have been found, one with a clear thermal boundary layer flow pattern and the other without, based on high Rayleigh numbers. For flow development in these two flow regimes, the transient scaling analysis is performed separately and the control mechanism for each phase is presented. Some new scale relationships are established to characterize the ventilation performance of solar chimneys, including thermal boundary layer thickness δT, velocity vT, mass flow m, and so on. For the distinct thermal boundary layers, δT,s ~ HΓ2/5/Bo1/5κ2/5, vT,s ~ Bo2/5κ4/5Γ1/5/H, m ~ ρBo1/5κ2/5Γ3/5. For nonobvious thermal boundary layers, vT,f ~ Bo1/3κ/H2/3W1/3, m ~ ρBo1/3κ/A2/3. The important scale relationships are validated using corresponding numerical simulation data, such as the mass flow rate scale M ~ (Γ/κ)3/5Bo1/5 in the distinct thermal boundary layer flow state, and so on. The air changes per hour and heat exchange efficiencies are calculated for a solar chimney with a fixed height‐to‐width ratio to provide a basis for the design of a solar chimney. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2050-0505 |
| Relation: | https://doaj.org/toc/2050-0505 |
| DOI: | 10.1002/ese3.1729 |
| URL الوصول: | https://doaj.org/article/2a01ad9058ff461995bee5ecb6a21a47 |
| رقم الأكسشن: | edsdoj.2a01ad9058ff461995bee5ecb6a21a47 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 20500505 |
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| DOI: | 10.1002/ese3.1729 |