CFD Analysis of the Heat Transfer and Fluid Flow Characteristics Using the Rectangular Rib Attached to the Fin Surface in a Solar Air Heater

Choi, Hwi-Ung; Moon, Kwang-am; Kim, Seong-Bhin; Choi, Kwang-Hwan

doi:10.3390/su15065382

Cited by 3 publications

(3 citation statements)

References 38 publications

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“…Hence, the air is employed in these ducts as a fluid domain [31,32]. As demonstrated in Table 1, it can recognize the air properties at 300 K [33].…”

Section: Methodology Of Cfd Simulationmentioning

confidence: 99%

Optimization of Laminar Flow in Non-Circular Ducts: A Comprehensive CFD Analysis

Hameed,

Mohammed,

Abbas

2023

JSE

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This study presents a detailed Computational fluid dynamics (CFD) analysis, focusing on optimizing laminar flow within non-circular ducts, specifically those with square, rectangular, and triangular configurations. The study centers on the effective use of mesh quality and size in these ducts, a factor which is previously underrepresented in those CFD studies that predominantly emphasized turbulent rather than laminar flows. With the help of finite element approach, this study compares the performance of these non-circular ducts, employing Reynolds numbers ranging from 1600 to 2000 and mesh sizes of 6, 12, and 18 mm. A ribbed duct style, arranged in a hybrid manner, is adopted to further this study. Analysis in this paper applied the Single predictive optimization (SPO) technique to the identification of the K-ε-Standard as the preferred viscosity model and a hybrid rib distribution as optimal within the triangular duct configuration. Parameters of a Reynolds number of 1600 and a mesh size of 18 mm emerged as the most effective values for this duct style. Then, the attained results of the Analysis of variance (ANOVA) indicated the F-Criterion's insignificance for Reynolds laminar levels, rendering the laminar viscosity model less relevant within the test section. Additionally, the implementation of the Six sigma procedure (SSP) markedly enhanced both the performance factor (PF) and turbulence intensity, which were observed at 4.90% and 146.77%, respectively. This improvement was most notable in the triangular duct, characterized by rib heights of 66 mm (semi-circle), 66 mm (rectangular), and 38.126 mm (triangular).

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“…Hence, the air is employed in these ducts as a fluid domain [31,32]. As demonstrated in Table 1, it can recognize the air properties at 300 K [33].…”

Section: Methodology Of Cfd Simulationmentioning

confidence: 99%

Optimization of Laminar Flow in Non-Circular Ducts: A Comprehensive CFD Analysis

Hameed,

Mohammed,

Abbas

2023

JSE

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“…The current research examines the effects of different arrangements of turbulators within a finned air channel of an SAH on heat transfer augmentation and friction factor. The average Nusselt number between the air and fin surface is expressed as follows [23,43]:…”

Section: Performance Indicatorsmentioning

confidence: 99%

“…where h avg represents the average value of the convection heat transfer coefficient, while D h and k air represent the hydraulic diameter and thermal conductivity of the air, respectively. The h avg was obtained from Equation ( 9) [23,43].…”

Section: Performance Indicatorsmentioning

confidence: 99%

Heat Transfer Augmentation and Friction Factor Due to the Arrangement of Rectangular Turbulators in a Finned Air Channel of a Solar Air Heater

An,

Choi,

Choi

2023

Energies

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In this study, the heat transfer augmentation and friction factor of a novel type of solar air heater (SAH), which incorporates longitudinal fins and rectangular turbulators, were investigated numerically with different arrangements of the turbulators. The effects of arrangements of rectangular turbulators placed in a finned air channel on its heat transfer augmentation and friction factor are discussed for Reynolds numbers ranging from 3000 to 15,000 using commercial ANSYS 17.2 software. Four different arrangements are investigated, including Array A, which places turbulators on both the fin’s side and base surfaces at the same position; Array B, where turbulators are sequentially placed on the fin’s side and base surfaces; Array C, where turbulators are only placed on the side surface; and Array D, where turbulators are placed only on the base surface. Array A showed the highest heat transfer augmentation and friction factor among the investigated arrangements. However, the highest thermo-hydraulic performance (THP), considering both the heat transfer augmentation and friction factor, was obtained in Array B, with a value of 1.36. Consequently, Array B was regarded as the most appropriate and effective arrangement method for the finned air channel of a SAH.

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Electrical and Thermal Performances of a Single-Pass Double-Flow Photovoltaic-Thermal Collector Coupled with Nonuniform Cross-Section Rib

Choi

2023

International Journal of Energy Research

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The air-based photovoltaic-thermal collector (PVTC) is a system that can generate electricity and heated air simultaneously from solar energy. This study investigates the electrical and thermal performances of an air-based single-pass double-flow photovoltaic-thermal collector (SPDFPVTC) coupled with a nonuniform cross-section rib (NUCSR) under various operating conditions. The rib is installed at the rear of the photovoltaic panel to enhance the heat transfer performance between the photovoltaic panel and the flowing air. Based on the energy balance equations, a mathematical model of the proposed SPDFPVTC is established and validated by experimental results. The solar intensity, air mass flow rate, and wind speed are selected as operating conditions. The effects of these operating conditions on the electrical and thermal performance of the SPDFPVTC have been discussed. In addition, this study evaluates the daily performance of SPDFPVTC with and without NUCSR. The average electrical, thermal, and overall efficiency were 17.59%, 43.96%, and 61.55%, respectively, for SPDFPVTC with NUCSR and 16.97%, 38.87%, and 55.83%, respectively, for SPDFPVTC without NUCSR. Consequently, installing NUCSR could enhance the daily electrical, thermal, and overall energy output of SPDFPVTC by 4.33%, 13.23%, and 10.63%, respectively.

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CFD Analysis of the Heat Transfer and Fluid Flow Characteristics Using the Rectangular Rib Attached to the Fin Surface in a Solar Air Heater

Cited by 3 publications

References 38 publications

Optimization of Laminar Flow in Non-Circular Ducts: A Comprehensive CFD Analysis

Optimization of Laminar Flow in Non-Circular Ducts: A Comprehensive CFD Analysis

Heat Transfer Augmentation and Friction Factor Due to the Arrangement of Rectangular Turbulators in a Finned Air Channel of a Solar Air Heater

Electrical and Thermal Performances of a Single-Pass Double-Flow Photovoltaic-Thermal Collector Coupled with Nonuniform Cross-Section Rib

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