STUDY ON THERMAL CHARACTERISTICS OF ADDING BAFFLE AT ENTRANCE OF SOLAR CHIMNEY COLLECTOR

Wang Jingwen; Nie Jing; Jia Jing; Yan Suying; Su Hao; Gao Hong

doi:10.19912/j.0254-0096.tynxb.2021-1514

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (4) : 499-505. DOI: 10.19912/j.0254-0096.tynxb.2021-1514

STUDY ON THERMAL CHARACTERISTICS OF ADDING BAFFLE AT ENTRANCE OF SOLAR CHIMNEY COLLECTOR

Wang Jingwen¹, Nie Jing^1,2, Jia Jing¹, Yan Suying^1,2, Su Hao¹, Gao Hong^1,2

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Abstract

In order to improve the efficiency of solar chimney heat collection system （SCHCS）, an optimized design scheme of adding transparent baffle at the entrance of collector was proposed. Three-dimensional numerical simulation combined with discrete ordinate （DO） radiation model and solar ray tracing were used to make a comparative study on the three models of without baffle, with one baffle and with two baffles at the entrance of collector. SCHCS such as test results with the same model size were used to verify the correctness of the simulation results. The effects of the three models on SCHCS temperature, speed, pressure, entropy production and heat collection efficiency were compared and analyzed, and a more appropriateoptimal design of heat collection shed was selected. The results show that the uniformity of temperature field, pressure field and velocity field of SCHCS can be improved by changing the design of collector entrance compared with no baffle. Compared with one baffle, two baffles can better improve the uniformity of temperature, pressure and velocity of the system. When the solar radiation is 200 W/m², the heat collection efficiency of two-layer baffle is 8.49% and 22.85% higher than that of non-baffle and one-layer baffle respectively. When the solar radiation is 1000 W/m², the heat collection efficiency of two-layer baffle is 9.71% and 13.05% higher than that of non-baffle and one-layer baffle respectively.

Key words

solar chimney / heat collecting system / structural optimization / heat collection efficiency

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Wang Jingwen, Nie Jing, Jia Jing, Yan Suying, Su Hao, Gao Hong. STUDY ON THERMAL CHARACTERISTICS OF ADDING BAFFLE AT ENTRANCE OF SOLAR CHIMNEY COLLECTOR[J]. Acta Energiae Solaris Sinica. 2023, 44(4): 499-505 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1514

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