Numerical simulation of a solar air heater equipped with wavy and raccoon-shaped fins: The effect of fins’ height

Rahmani, Ebrahim; Moradi, Tofigh; Fattahi, Abolfazl; Delpisheh, Mostafa; Karimi, Nader; Ommi, Fathollah; Saboohi, Zoheir

doi:10.1016/j.seta.2021.101227

Cited by 20 publications

(11 citation statements)

References 37 publications

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“…They revealed that due to the production of secondary-flow vortices on the absorber surface, the multiple V-ribs patterns with symmetric gaps resulted in a significant increase in Nusselt number ( Nu ) and a friction factor ( ff ). Rahmani et al ( 2021 ) numerically simulated the performance of SAH with wavy and raccoon-shaped fins. They observed that increasing the fin height resulted in a 50% increase in Nu and ff escalation of nearly the same value.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and optimization of dimple-roughened impinging jet solar air collector using a novel AHP-MABAC approach

Salman

Chauhan

Singh

et al. 2022

Environ Sci Pollut Res

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The effect of the flow and geometric parameters of a dimple-roughened absorber plate on the enactment of solar air collectors (SACs) with air-impinged jets was investigated in this study. The performance-defining criteria (PDCs) of a jet-impinged dimple-roughened SAC (JIDRSAC)-forced convection airflow system are significantly affected by variations in the system’s control factors (CFs), such as the arc angle ( α aa ) ranging from 30° to 75°, dimple pitch ratio ( p d / D h ) ranging from 0.269 to 1.08, and dimple height ratio ( e d /D h ) ranging from 0.016 to 0.0324. The constant parameters of the jet slot are a stream-wise pitch ratio (X i /D hd ) is 1.079, a span-wise pitch ratio (Y i /D hd ) is 1.619, and a jet diameter(D i /D hd ) is 0.081. Based on the combined approach of the analytic hierarchy process and multi-attributive border approximation area comparison (AHP-MABAC), the Reynolds number ( Re ) = 15,000, α aa = 60°, p d / D h = 0.27, and e d / D h = 0.027 depicted the best alternative (A-9) set among 16 alternatives to deliver the optimal performance of the JIDRSAC. The jet impingement pass compared to the smooth pass, the Nusselt number increased by 2.16–2.81, and friction factor increased by 3.35–5.95, and JIDRSAC was compared to the jet impingement pass, exhibiting an enhancement in Nusselt number and friction factor in the range of 0.55–0.80 and 0.05–0.15, respectively. In addition, sensitivity analysis is used to examine the ranking's stability and reliability in relation to the PDC weights.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation and optimization of dimple-roughened impinging jet solar air collector using a novel AHP-MABAC approach

Salman

Chauhan

Singh

et al. 2022

Environ Sci Pollut Res

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“…In this regard, solar energy is among the energy resources available to humans that have received considerable attention. [6][7][8][9][10] Therefore, many studies have been conducted in this field whose results strongly recommend using renewable energy. [11][12][13][14] Recently, increasing the heat transfer rate (HTR) in renewable systems has been of interest to researchers.…”

Section: Introductionmentioning

confidence: 99%

“…It has been found that renewable energy can properly meet the needs of countries. In this regard, solar energy is among the energy resources available to humans that have received considerable attention 6–10 . Therefore, many studies have been conducted in this field whose results strongly recommend using renewable energy 11–14 …”

Section: Introductionmentioning

confidence: 99%

Simulation of a parabolic trough solar collector containing hybrid nanofluid and equipped with compound turbulator to evaluate exergy efficacy and thermal‐hydraulic performance

Khetib

Alahmadi

Alzaed

et al. 2021

Energy Science & Engineering

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This research is mainly aimed at investigating the numerical modeling of thermal‐hydraulic and exergy efficiencies of parabolic trough solar collectors (P‐SCs) filled with magnetic hybrid nanofluid. The k‐epsilon turbulence, S2S, and mixture models were used to simulate the turbulence equations, radiation, and two‐phase nanofluid, respectively. The experiments were run using magnetic nanofluid in Reynolds numbers of 5000‐20 000, the volume fractions of 1%‐3%, and the ratios of pitch (ROPs) of 1, 2, and 3 of the combined turbulator. According to the results, there is a significant increase in average Nusselt number (Nu) and pressure drop (ΔP) with increasing Reynolds number, nano‐additive concentration, and ROP. Moreover, the use of the hybrid magnetic turbulator and hybrid nanofluid increased the thermal performance of the P‐SC. It was also found that the Reynolds number of 20 000 and volume fraction of 3% of nanoparticles resulted in the optimal exergy efficiency mode in using a hybrid turbulator.

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“…21 Heat transfer is low in SAHs due to the laminar viscous layer. [22][23][24] Elements such as rough surfaces, fins, and baffles are usually used to increase heat transfer. The use of baffles and fins on absorber plates of SAHs increases turbulence and therefore increases heat transfer and pressure drop.…”

mentioning

confidence: 99%

“…In previous studies, the effect of baffles on heat transfer and pressure drop in solar air collector and heat exchangers has been investigated experimentally and numerically. [22][23][24][25][26][27] Studies focusing on the thermal performance of SACs are common in the literature. Avargani et al 28 evaluated the effect of various geometric obstacles (conical, cylindrical, spherical, pyramidal, and cubic obstacles) on energy, exergy, and thermohydraulic performance in SACs.…”

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confidence: 99%

Numerical investigation of the effect of using louver baffles on thermal performance in solar air collectors

Tuğan

Işik

2023

Env Prog and Sustain Energy

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Conventional flat plate solar air collectors have advantages such as low cost and simple design. However, their thermal efficiency is lower than that of other designs. The thermal efficiency of these collectors can be increased by detailed examination of parameters such as the shape, size, arrangement and material of the air duct. In this study, it is aimed to improve the thermal efficiency of solar air collectors. The effect of louver baffles, which were not previously used in solar air collectors, on thermal efficiency was investigated numerically via computational fluid dynamics. Three different solar air collectors with flat plates, segmented baffles, and louver baffles were compared in terms of thermal efficiency. In addition, pressure drops in solar air collectors were investigated. The mass flow rate of the air in all collectors is assumed to be 0.04 kg/s. Analyzes were carried out between 09:00 and 16:00. The thermal efficiency values obtained during the day for solar air collectors with flat plate, segmented baffles and louver baffles are 27.66%–56.35%, 29.57%–58.82% and 30.09%–59.47%, respectively. The daily thermal efficiency values obtained for solar air collectors with flat plate, segmented baffles and louver baffles are 46.98%, 49.18% and 49.87%, respectively. The pressure drop for solar air collectors with flat plate, segmented baffles and louver baffles were found to be 4.62, 18.82 and 5.96 Pa, respectively. Based on the data obtained from this study, louver baffles are recommended for use in solar heating applications due to their high thermal efficiency and low pressure drop.

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Numerical simulation of a solar air heater equipped with wavy and raccoon-shaped fins: The effect of fins’ height

Cited by 20 publications

References 37 publications

Experimental investigation and optimization of dimple-roughened impinging jet solar air collector using a novel AHP-MABAC approach

Experimental investigation and optimization of dimple-roughened impinging jet solar air collector using a novel AHP-MABAC approach

Simulation of a parabolic trough solar collector containing hybrid nanofluid and equipped with compound turbulator to evaluate exergy efficacy and thermal‐hydraulic performance

Numerical investigation of the effect of using louver baffles on thermal performance in solar air collectors

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