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Numerical Simulation and Analysis on Solar Chimneys for Buildings Integration of Renewable Energy Devices

机译：可再生能源设备建筑物集成的数值模拟与分析

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Heat transfer process and natural ventilation effectiveness driven by a solar chimney attached to a sidewall of building are investigated with CFD technique in detail. In this paper, conditions and parameters studied in the modelling study are the cavity width of the solar chimney, the wall temperature, the height and breadth of the solar chimney, the ratio of outlet area to inlet area as well as the outlet location of the solar chimney. The ranges of calculation parameters focused on a solar chimney with single-sided solar collector(single-sided heated wall)cover following conditions: solar chimney length L=0.5m～5.0m, breadth B=0.1m～0.5m, height H=2.0m～5.0m, and B/H=0.05～0.25. Heated wall surface temperature Tw is changed in the range of 30°C ～70°C;the ratio of the outlet area to inlet area Ar is changed in the range of 0.6～0.8. It is found that for given building geometry and inlet areas, there is an optimum cavity width at which a maximum airflow rate can be achieved. Based on the prediction, the airflow rate reaches maximum when B/H is approximately 1/10. It is also found that for given chimney geometry, solar chimney ventilation flow rate can be increased with the enhancement of chimney height only the cross sectional area no more than the critical area, because cross section area has a strong effect on the transitional and/or turbulent convective heat transfer in an enclosure. From the view of economy technology, the optimized height of a solar chimney can be determined according to the optimized section ratio of breadth to height and available breadth in practice. It is also noted that optimized ventilation flow rate can be obtained when the outlet area takes the same area as the inlet area.Generally, there is good agreement between the numerical results and available experimental data from literature for a solar chimney.
机译：通过CFD技术研究了附着在建筑物侧壁上的太阳能烟囱驱动的传热过程和自然通风效果。在本文中，在建模研究中研究的条件和参数是太阳能烟囱，壁温，太阳能烟囱的高度和宽度的腔宽，出口区域与入口区域的比例以及出口位置太阳能烟囱。计算参数的范围集中在带有单面太阳能电池（单面加热墙）盖的太阳能烟囱覆盖条件：太阳能烟囱长度L = 0.5m〜5.0m，宽度B = 0.1m〜0.5m，高度H = 2.0m〜5.0m，b / h = 0.05〜0.25。加热壁表面温度Tw在30°C〜70°C的范围内变化;出口区域与入口区域AR的比率在0.6〜0.8的范围内变化。发现，对于给定的构建几何和入口区域，存在最佳腔宽，在此可以实现最大气流率。基于预测，当B / H约为1/10时，气流率最大达到最大值。还发现，对于给定的烟囱几何形状，可以随着烟囱高度的增强而增加太阳能烟囱通风流量，只有横截面积不超过临界区域，因为横截面区域对过渡和/或具有很强的影响湍流对流热传递在外壳中。从经济技术的角度来看，太阳烟囱的优化高度可以根据广度的优化部分比率与高度的优化截面比和可用广度的实践。还应注意，当出口区域与入口区域接受相同的区域时，可以获得优化的通风流速。总之，数值结果和来自太阳烟囱的文献的可用实验数据之间存在良好的一致性。

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