Parametric CFD study of Solar Air Heater having alternated upper and bottom absorber plates in turbulent flow

IF 1.7 4区工程技术 Q3 THERMODYNAMICS

Heat Transfer Research Pub Date : 2023-11-01 DOI:10.1615/heattransres.2023049434

Djemel Hassene, Benmabrouk Amine, Hammami Moez, Baccar Mounir

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Abstract

This work presents a CFD investigation of a Solar Air Heater that features alternating upper and bottom absorber plates to evaluate its thermal behavior and turbulent flow characteristics. Generally, the SAH exhibits low heat transfer characteristics and poor thermal efficiency in turbulent flow. The use of alternating upper and bottom absorber plates facing the turbulent flow would improve heat transfer by producing recirculation zones mainly over these heated plates. The Computational Fluid Dynamics software program, Ansys Fluent 15.0, along with the RNG k-ε turbulence model, was utilized in this analysis to solve the transport equations for turbulent kinetic energy and dissipation rate. The analysis encompassed several geometric and operating parameters, including the range of relative absorber plate length (lp/h) from 4.375 to 140, relative absorber plate height (h/H) ranging from 0.03 to 0.12, and Reynolds numbers varying between 3800 and 18000. The impact of these parameters on heat transfer improvement factors, including the Heat Transfer Amelioration Factor (HTAR), Friction Loss Amelioration Factor (FLAR), and Thermo-Hydraulic Efficiency Factor (THEF), was studied. The optimum computed THEF value was found to be 2.18 for (Lp/h) = 4.375, (h/H) = 0.12, and Re = 3,800

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紊流条件下上下板交替吸收体太阳能空气加热器的参数CFD研究

本文介绍了一种具有上下交替吸收板的太阳能空气加热器的CFD研究，以评估其热行为和湍流特性。总的来说，SAH在湍流中表现出较低的传热特性和较差的热效率。使用面对湍流的上下交替吸收板可以通过在这些被加热的板上产生再循环区来改善传热。利用计算流体动力学软件Ansys Fluent 15.0，结合RNG k-ε湍流模型，求解了湍流动能和耗散率的输运方程。分析包括几个几何和操作参数，包括相对吸收板长度(lp/h)范围为4.375至140，相对吸收板高度(h/ h)范围为0.03至0.12，雷诺数范围为3800至18000。研究了这些参数对传热改善因子(包括传热改善因子(HTAR)、摩擦损失改善因子(FLAR)和热水效率因子(THEF)的影响。当(Lp/h) = 4.375， (h/ h) = 0.12, Re = 3800时，计算出的最佳THEF值为2.18

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来源期刊

Heat Transfer Research 工程技术-热力学

CiteScore

3.10

自引率

23.50%

发文量

102

审稿时长

13.2 months

期刊介绍： Heat Transfer Research (ISSN1064-2285) presents archived theoretical, applied, and experimental papers selected globally. Selected papers from technical conference proceedings and academic laboratory reports are also published. Papers are selected and reviewed by a group of expert associate editors, guided by a distinguished advisory board, and represent the best of current work in the field. Heat Transfer Research is published under an exclusive license to Begell House, Inc., in full compliance with the International Copyright Convention. Subjects covered in Heat Transfer Research encompass the entire field of heat transfer and relevant areas of fluid dynamics, including conduction, convection and radiation, phase change phenomena including boiling and solidification, heat exchanger design and testing, heat transfer in nuclear reactors, mass transfer, geothermal heat recovery, multi-scale heat transfer, heat and mass transfer in alternative energy systems, and thermophysical properties of materials.