کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4916106 1428086 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical modelling and comparison of the performance of diffuser-type solar chimneys for power generation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
پیش نمایش صفحه اول مقاله
Numerical modelling and comparison of the performance of diffuser-type solar chimneys for power generation
چکیده انگلیسی
Theoretically, making the chimney top larger than the chimney base can increase the driving potential of the Solar Chimney (SC) system. Based on this concept, the divergent chimney (DSC), the cylindrical chimney with a divergent outlet (DOSC) and the cylindrical chimney with a divergent inlet (DISC) are numerically examined in this study for revealing their aerodynamic features and the capability of power generation. The simulating outcomes indicate that the diffuser-type SCs generally have a better power generation performance than the cylindrical SC: the optimal output of the examined DSCs is ∼13.5 times higher than that of cylindrical SC; the increase in the output from the DISCs ranges from 2 to 10 times while the optimal situation from the DOSCs is only ∼5 times. The difference in the system performance is further found to be related to the chimney geometric parameters that have critical impacts on the expansion loss in the divergent flow channel. Based on the aerodynamic characteristics of the diffuser-type SCs, a new controlling approach for the SC is proposed with a variable diffuser outlet and an example is illustrated by using the DOSC. The example reveals that the SC with the controlling treatment had a stable output for 7 h during the daytime and its power output is 60% higher than the SC without any control.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 204, 15 October 2017, Pages 948-957
نویسندگان
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