Numerical investigations of fluid flow and heat transfer characteristics in solar air collector with curved perforated baffles

El‐Said, Emad M.S.

doi:10.1002/eng2.12142

Cited by 18 publications

(4 citation statements)

References 46 publications

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“…Experimental studies on different modifications for multipass SAH have been performed to demonstrate their effectiveness [24][25][26]. In addition, with the development of numerical algorithms and computer processors, CFD (computational fluid dynamics) studies have been conducted to reduce the experimental time and costs [27][28][29][30][31]. More recently, Heydari et al [32] proposed and numerically examined a novel helical airflow path around triangular channels.…”

Section: Introductionmentioning

confidence: 99%

First and Second Law Evaluation of Multipass Flat-Plate Solar Air Collector and Optimization Using Preference Selection Index Method

Luân

Phu

2021

Mathematical Problems in Engineering

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In this paper, different flow configurations of multipass flat-plate air collectors are explored. Multiple passes are formed from glass cover, absorber plate, and back plate. Five types of air collectors were analysed and optimized with respect to maximum efficiencies and minimum cost. The analytical prediction of the heat exchanger, pressure loss, and efficiencies was presented. The effects of mass flow rate from 0.01 to 0.02 kg/s, air channel depth from 15 to 30 mm, and collector length from 1.5 to 2.5 m on different configurations were examined and compared. The results of the parametric study show that the triple-pass type has the greatest efficiency, whereas the smallest efficiency is of the single-pass type. Among double-pass types, the type with two glass covers and natural convection heat transfer achieved the highest effective and exergy efficiencies due to a reduction in the top loss. Double-pass type with single glass cover is not recommended from both energy and exergy standpoints. As the collector length increases, the effective efficiency decreases, but the exergy efficiency increases. The exergy performance of the triple-pass type can reach up to 5% at the air flow rate of 0.005 kg/s. Finally, multiobjective optimization using the preference selection index method is conducted with three targets including effective efficiency, exergy efficiency, and number of plates. Optimal results show that the triple-pass type with the lowest air flow rate and the longest length is the best. The effective and exergy efficiencies for the best case were found to be about 52.1% and 4.7%, respectively. However, this type with the highest flow rate and the shortest length is the worst.

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Section: Introductionmentioning

confidence: 99%

First and Second Law Evaluation of Multipass Flat-Plate Solar Air Collector and Optimization Using Preference Selection Index Method

Luân

Phu

2021

Mathematical Problems in Engineering

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“…El-Said [89] numerically studied the heat transfer behavior of air in a perforated baffle attached to an absorber plate (shown in Figure 20) at a certain angle using Navier-Stokes and energy equations. It was found that the thermal efficiency and outlet temperature increased and pressure was decreased by enhancing the hole diameter of the baffle, while both parameters reduced by raising the baffle inclination angle to a maximum efficiency of 77%, which was achieved at a 3 mm diameter, 7 • angle, and 0.07 kg/s flow rate.…”

Section: Baffle Shapesmentioning

confidence: 99%

A Comprehensive Review of the Thermohydraulic Improvement Potentials in Solar Air Heaters through an Energy and Exergy Analysis

Hassan,

Nikbakht,

Fawzia

et al. 2024

Energies

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Supply disruptions, uncertainty, and unprecedented price rises of fossil fuels due to the recent pandemic and war have highlighted the importance of using renewable sources to meet energy demands. Solar air collectors (SACs) are major types of solar energy systems that can be utilized for space and water heating, drying, and thermal energy storage. Although there is sufficient documentation on the thermal analyses of SACs, no comprehensive reviews of the exergetic performance or qualitative insight on heat conversion are available. The primary objective of this article is to provide a comprehensive review on the optimum conditions at which the thermal performance of diverse types of solar air collectors is optimized. The effect of operating parameters such as temperature rise, flow rate, geometric parameters, solar radiation, and the Reynolds number on the thermal performance of SACs in terms of thermal hydraulic performance, energy, and exergy efficiencies has been reviewed adaptively. Beyond the operating parameters, a deep investigation is outlined to monitor fluid dynamics using analytical and computational fluid dynamics (CFDs) methodologies in the technology of SACs. In the third phase, thermodynamic irreversibility due to optical losses, thermal losses between absorber and environment, heat losses due to insulation, edge losses, and entropy generation are reported and discussed, which serve as the fundamental tools for optimization purposes.

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“…Saravanakumar (2020) used arc shaped rib and Wang (2020) suggested "S" shaped ribs with gap for enhancing the rate of convection heat transfer. Another way for enhancing heat transfer is using baffles with different shapes, such that this technique was examined by Bayrak (2013), El-Said (2020), Fiuk (2019), Hachemi (1995), Chabane (2014) and Yang (2014). Replacing flat plate absorber with V-groove corrugated absorber is another method for performance improvement and many investigators including Ho (2017), Desisa (2020) and El-Sebaii (2011) studied about this technique.…”

Section: Introductionmentioning

confidence: 99%

“…Another way for enhancing heat transfer is using baffles with different shapes, such that this technique was examined by Bayrak (2013), El-Said (2020), Fiuk (2019), Hachemi (1995), Chabane (2014) and Yang (2014). Replacing flat plate absorber with V-groove corrugated absorber is another method for performance improvement and many investigators including Ho (2017), Desisa (2020) and El-Sebaii (2011) studied about this technique. A numerical analysis of solar air dryer with a V-groove double pass collector carried out by Hassan (2022) and the obtained findings which revealed the positive effect of the applied method were validated with experiment.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of an Efficient New-Design Solar Air Heater by CFD Method

Moein Addini,

Abdolreza Gandjalikhan Nassab

2023

JSSCM

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The main contribution of this study is to present a modified V-corrugated grooved absorber plate in the construction of plane solar air heaters for higher performance. The combined effects of extended heat transfer area due to the V-shaped absorber, the suction process by the grooves that maintains the convective flow closed to the heated absorber and the jet impingement enable high efficiency of the proposed solar collector. For simulation purposes, the conduction equation is employed for temperature computations inside the solid elements, while the turbulent airflow equations are solved based on the CFD method using the ÎºÎµâˆ’ turbulence model. The present finite element-based analysis is performed using the COMSOL Multi-physic software. To demonstrate the rate of irreversibilities in a solar collector, the entropy generation due to heat transfer and viscous friction and, accordingly, the second law efficiency are computed at different steady operating conditions. The numerical procedure is validated by comparing the obtained numerical findings with the experimental results reported in the literature. From the obtained results, it is found that the proposed absorber plate has a triple-edged sword positive effect on the solar air heater performance, such that the thermal efficiencies up to 80% are computed. Moreover, about 10% improvement in the thermal efficiency of the proposed solar collector compared with its competitor (solar air heater with a simple V-corrugated absorber) reveals the positive impact of the designed absorber plate. Also, the increase in the height of V-shaped absorber from ð»ð»0=2 ð‘ð‘ð‘ð‘ ð‘¡ð‘¡ð‘¡ð‘¡ ð»ð»0=4 ð‘ð‘ð‘ð‘ leads to about 11% improvement in the heater thermal efficiency. The numerical findings can be considered as a good reference to find an alternative for efficient solar collectors.

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Numerical investigations of fluid flow and heat transfer characteristics in solar air collector with curved perforated baffles

Cited by 18 publications

References 46 publications

First and Second Law Evaluation of Multipass Flat-Plate Solar Air Collector and Optimization Using Preference Selection Index Method

First and Second Law Evaluation of Multipass Flat-Plate Solar Air Collector and Optimization Using Preference Selection Index Method

A Comprehensive Review of the Thermohydraulic Improvement Potentials in Solar Air Heaters through an Energy and Exergy Analysis

Performance Analysis of an Efficient New-Design Solar Air Heater by CFD Method

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