Optimizing structure of baffles on thermal performance of spiral solar air heaters

被引：30

作者：

Jia, Binguang ^{[1
]}

Yang, Luopeng ^{[1
,2
]}

Zhang, Linhua ^{[1
]}

Liu, Bing ^{[2
]}

Liu, Fang ^{[1
]}

Li, Xiao ^{[3
]}

机构：

[1] Shandong Jianzhu Univ, Sch Thermal Engn, Jinan 250101, Shandong, Peoples R China

[2] Shandong Jianzhu Univ, Sch Municipal & Environm Engn, Resources & Environm Innovat Inst, Jinan 250101, Peoples R China

[3] Shandong Inst Prod Qual Inst, Jinan 250102, Shandong, Peoples R China

来源：

SOLAR ENERGY | 2021年 / 224卷

基金：

中国国家自然科学基金;

关键词：

Spiral solar air heaters; Pressure loss; Collection efficiency; Right angle turnings; Rectangular holes; ARTIFICIAL ROUGHNESS; PLATE; ENERGY;

D O I：

10.1016/j.solener.2021.06.043

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

In order to further improve the thermal performance of spiral solar air heaters (SSAHs), three-dimensional mathematical models of four proposed types of spiral solar air heaters, including right angle spiral solar air heaters (RA-SSAHs), arc spiral solar air heaters (ARC-SSAHs), arc spiral solar air heaters with rectangular holes (ARC-RH-SSAHs) and rectangular holes spiral solar air heaters (RH-SSAHs), were developed by CFD to analyze the effect of baffles structure on the microscopic characteristics of flow and heat transfer. The profiles of velocity proved that the channel with both right angle turnings and rectangular holes contributed to decreasing the pressure loss by depressing the intensity and scale of the separated vortex and corner vortex. RH-SSAHs, which exhibited the highest collection efficiency among the four types of SSAHs, proved that the optimizing structure of baffles in channels contributed to reducing the heat loss rate by transparent cover plate more significantly than reducing the absorbed heat rate of air by increasing the transverse velocity and decelerating the air flowing along the channels due to bypass air through the holes.

引用

页码：757 / 764

页数：8

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