Simplified calculation method of corrugated solar ventilation preheating wall thermal efficiency

被引：0
|
作者：
Gao M. [1 ]
Zhou Y. [2 ]
Wang D. [1 ,2 ]
Liu Y. [1 ,2 ]
机构：
[1] School of Building Services Science and Engineering, Xi'an University of Architecture and Technology, Xi'an
[2] State Key Laboratory of Green Building in Western China, Xi'an
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2022年 / 43卷 / 09期
关键词：
Numerical simulation; Preheating wall; Simplify calculations method; Solar energy; Ventilation;
D O I：
10.19912/j.0254-0096.tynxb.2021-0033
中图分类号：
学科分类号：
摘要：
This paper establishes a numerical simulation model of the solar ventilation preheating wall in purpose of obtaining a simplify calculations method for the thermal efficiency that can be easily applied. Five structural parameters, such as height ratio H*, characteristic thickness δ*, porosity σ, corrugation concavity Lw, and corrugation degree w*, are introduced. The coupling relationship between them and the near-wall Reynolds number Re on the solar wall Nusselt number Nu, heat transfer coefficient Hε and differential pressure value pdrop is investigated by numerical simulation. The system performance indexes present a power function law with respect to Re, and a quadratic exponential function law in relation to the logarithm of σ and other parameters. The calculated empirical coefficients are obtained using the LM optimization algorithm. The results indicate that the simplified calculation results of Nu number and differential pressure have a maximum deviation of 6.85% from the simulation results. The simplified calculation results of heat collection efficiency have an average error of 4.89% and a maximum error of 6.69% with the experimental test results. The accuracy of the corrected data is improved by nearly 10% on average compared with the corrected values achieved by the traditional calculation method. The results are in good agreement and provide a reference for engineering design. © 2022, Solar Energy Periodical Office Co., Ltd. All right reserved.
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页码：176 / 183
页数：7
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