Performance analysis of solar chimney using mathematical and experimental approaches
Performance analysis of solar chimney using mathematical and experimental approaches
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DOI：
10.1002/er.4007
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发表时间：
2018-06
影响因子：
4.6
通讯作者：
Sivaram P.M.;S. Harish;Premalatha M.;A. A.-A.
中科院分区：
文献类型：
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作者：
Sivaram P.M.;S. Harish;Premalatha M.;A. A.-A.
建立了基于太阳能烟囱一维能量和质量平衡的数学模型。根据集热器倾角、每小时太阳辐射、环境温度和风速来评估空气流动特性，如出口速度和温度。通过将所得到的性能参数与实验结果以及文献中不同几何范围和环境条件下的实验数据进行比较，验证了该模型的有效性。当太阳能烟囱的吸热板倾角为30°，集热器面积为0.41m2，烟囱高度为0.24m时，4月份的日平均风速和最大风速分别为0.5m/S和0.88m/hm2，平均偏差为8%，出口温度的平均偏差为1.35%。预测的最佳运行条件为倾角75°，吸收塔面积0.63m~2，烟囱高度0.48m。在最佳工况下，数值计算得到的最大平均出口风速为0.64m/S，最大平均出口温度为331K。实验结果表明，对于高度为0.5m的太阳能烟囱，吸热面积由0.5m~2增加到3m~2时，排风速度提高了33%。对于吸收面积为0.64m2的太阳能烟囱，烟囱高度从0.5m增加到3m，出口风速提高了52%。当风量从1.5m/S增加到3m/m时，出口风速降低了4%，证实了该模型可以根据预测的月性能进行太阳能烟囱的设计。
A mathematical model based on one‐dimensional energy and mass balance across the solar chimney has been developed. The air flow characteristics such as exit velocity and temperature are evaluated with respect to the collector inclination angle, hourly solar radiation, ambient temperature, and wind speed. The model is validated by comparing the performance parameters obtained, with the experimental results and also with the experimental data of different geometrical range and environmental conditions from the literature. An average deviation of 8% for exit air velocity and 1.35% for exit air temperature is obtained for the solar chimney with absorber inclination angle 30°, collector area 0.41 m2, and chimney height 0.24 m. The experimental daily average and maximum exit air velocity during the month of April are 0.5 and 0.88 m/s, respectively. The predicted optimum operating conditions are 75° inclination angle, 0.63 m2 absorber area, and 0.48‐m chimney height. The maximum average exit air velocity and temperature numerically obtained are 0.64 m/s and 331 K, respectively, when operating with optimum conditions. It is observed that the exit air velocity increases 33% by increasing the absorber area from 0.5 to 3 m2 for a solar chimney with 0.5 m height. An increase in exit air velocity of 52% was obtained by increasing the chimney height from 0.5 to 3 m for a solar chimney with 0.64 m2 absorber area. A reduction in exit air velocity of 4% was observed for the increment in wind flow over the glass cover from 1.5 to 3 m/s. These results confirm that the solar chimney could be designed based on the predicted monthly performance by the present model.