Comprehensive energy, exergy, enviro-exergy, and thermo-hydraulic performance assessment of a flat plate solar air heater with different obstacles

Avargani, Vahid Madadi; Zendehboudi, Sohrab; Rahimi, Amir; Soltani, Sara

doi:10.1016/j.applthermaleng.2021.117907

Cited by 29 publications

(2 citation statements)

References 33 publications

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“…Various factors influence the HTR in the methods of multiple jet impingements. The solar receivers operate under the equivalent principle, dissipating solar energy and effectively transmitting heat energy to the fluid [6][7][8]. The IMFJ effectively employed partial air gaps and caused higher HTR.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Thermo-Hydraulic Efficiency of an Indoor-Designed Jet Impingement Solar Thermal Collector Roughened with Single Discrete Arc-Shaped Ribs

et al. 2022

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This study illustrates the impact of single discrete arc-shaped ribs (SDASR)-type artificial roughness on the performance of a jet impingement solar thermal collector (JISTC). The impact of parametric variations of SDASR on the Nusselt number (Nusdr), friction factor (fsdr), and thermohydraulic performance (ηsdr) is examined. The spacer length (Ssdr) of the SDASR was changed from 0 mm to 300 mm in stages of 100 mm during the experiment. The fixed parameters of the SDASR were a relative discrete distance Dd/Lv of 0.67, relative discrete width gw/Hr of 0.87, relative rib height Hr/H of 0.047, relative rib pitch Pr/H of 1.7, angle of an arc αsdr of 60°, jet diameter ratio Dj/Dhy of 0.065, streamwise pitch ratio X/Dhy of 1.72, and spanwise pitch ratio Y/Dhy of 0.82. The Reynolds number Re was altered from 3000 to 19,000. The Nusdr and fsdr of a JISTC with a roughened absorber plate was found to be enhanced by 5.25 and 5.98 times as compared to an STC without artificial roughness. The optimal findings of Nusdr, fsdr, and ηsdr were achieved at Ssdr = 0 mm. The maximum value of the ηsdr obtained at Ssdr = 0 mm was 2.9.

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Section: Introductionmentioning

confidence: 99%

Assessment of the Thermo-Hydraulic Efficiency of an Indoor-Designed Jet Impingement Solar Thermal Collector Roughened with Single Discrete Arc-Shaped Ribs

et al. 2022

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“…[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. The best performance was achieved with vertical cylindrical obstacles.…”

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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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Effect of fluid flow behavior on sustainability and exergy efficiency of solar heat collectors having multiple V‐ribs with gaps

Maithani,

Kumar,

Sharma

et al. 2024

Heat Trans

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In the current numerical study, the viability and sustainability of a solar heat collector (SHC) have been rigorously analyzed through the lens of exergy analysis. The SHC with roughness in the form of symmetrical V‐rib gaps has been selected for detailed numerical investigation. The study focuses on deriving the dominant parameters affecting the performance of the SHC, including the relative gap width (), number of gaps () in the limbs of ribs, and fluid flow Reynolds number, which varied from 4000 to 18,000. The absorber plate with roughness was thoroughly examined to evaluate the losses and irreversibility that persist in the thermal system. The results of the numerical analysis revealed the maximum exergy efficiency to be 3.87%. Furthermore, the study examined the long‐term feasibility of the system, evaluating its sustainability index at a remarkable 1.0319 value, while the magnitude of the waste–energy ratio fetched an impressive score of 0.991. Additionally, the study found that the system has a significant improvement potential of 10.04. Overall, these findings provide critical insights into the performance and sustainability of SHCs, paving the way for future research and development in this crucial field.

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Comprehensive energy, exergy, enviro-exergy, and thermo-hydraulic performance assessment of a flat plate solar air heater with different obstacles

Cited by 29 publications

References 33 publications

Assessment of the Thermo-Hydraulic Efficiency of an Indoor-Designed Jet Impingement Solar Thermal Collector Roughened with Single Discrete Arc-Shaped Ribs

Assessment of the Thermo-Hydraulic Efficiency of an Indoor-Designed Jet Impingement Solar Thermal Collector Roughened with Single Discrete Arc-Shaped Ribs

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

Effect of fluid flow behavior on sustainability and exergy efficiency of solar heat collectors having multiple V‐ribs with gaps

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