利用条缝射流强化无盖板型太阳能集热器性能

金健; 胡建军; 胡桂; 杜胜华

doi:10.19912/j.0254-0096.tynxb.2022-0325

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太阳能学报 ›› 2023, Vol. 44 ›› Issue (3) : 533-540. DOI: 10.19912/j.0254-0096.tynxb.2022-0325

利用条缝射流强化无盖板型太阳能集热器性能

金健^1,2, 胡建军^1,2, 胡桂^1,2, 杜胜华^1,2

作者信息 +

PERFORMANCE ENHANCEMENT OF UNGLAZED SOLAR COLLECTOR BY SLIT JET

Jin Jian^1,2, Hu Jianjun^1,2, Hu Gui^1,2, Du Shenghua^1,2

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文章历史 +

摘要

为提升无盖板型太阳能空气集热器热性能,设计一种条缝射流型太阳能空气集热器,并利用数值模拟和实验验证对其热性能进行分析。集热器内部流动及换热特性的模拟结果表明,利用圆孔和挡片形成的条缝射流能对集热板形成有效覆盖,进而提高进气与集热板的对流换热。射流条缝存在最优结构参数,当圆孔直径为25 mm时,条缝宽度在3 mm处接近最优;集热效率则随挡片直径的增大而增大,是由于射流贴附效应在变强。实验结果表明,条缝射流型集热器的全天热效率稳定且高效。当处理气量为39 m³/h时,该集热器全天热效率稳定在约48%,优于传统的无盖板渗透型太阳能集热器。

Abstract

To improve the thermal performance of the unglazed solar air collector, a solar air collector using slit jet is designed, and its performance is analyzed experimentally and numerically. The simulation results of the internal flow and heat transfer characteristics of the collector show that the wall-attached slit jet formed by the circular holes and baffles can effectively cover the perforated absorber plate and thus improve the convective heat transfer between the air and the absorber plate. The optimal width of the slit is 3 mm when the diameter of the circular hole is 25 mm. The heat collection efficiency increases with the increase of baffle diameter because of the strong wall attachment effect. The experimental results show that the all-day thermal efficiency of the slit-jet solar air collector is stable and efficient. The all-day thermal efficiency of this solar air collector is up to 48% when the flow rate is 39 m³/h,which is better than the traditional unglazed solar air collector.

导出引用

金健, 胡建军, 胡桂, 杜胜华. 利用条缝射流强化无盖板型太阳能集热器性能[J]. 太阳能学报. 2023, 44(3): 533-540 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0325

Jin Jian, Hu Jianjun, Hu Gui, Du Shenghua. PERFORMANCE ENHANCEMENT OF UNGLAZED SOLAR COLLECTOR BY SLIT JET[J]. Acta Energiae Solaris Sinica. 2023, 44(3): 533-540 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0325

中图分类号： TK513

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