Efficiency of Recycling Double-Pass V-Corrugated Solar Air Collectors

Ho, C. H.; Hsiao, Ching-Fang; Chang, Hsuan; Tien, Yi-En; Hong, Zih-Syuan

doi:10.3390/en10070875

Cited by 13 publications

(5 citation statements)

References 19 publications

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“…Furthermore, the lowest collector efficiency improvements were found to take place when employing Type A [33], as shown in Table 4, and resulted in a less thermally efficient configuration among all the proposed external-recycle configurations. The extents of collector efficiency improvements were more significant with the recycle ratios than those in the V-corrugated device of the same operational conditions [41]; thus, a higher value of IC,A/IP,A is obtained by operating double-pass cross-corrugated solar air collectors with external recycling, as demonstrated in Figure 15. With those comparisons, the advantage of the cross-corrugated design for solar air collectors is evident.…”

Section: Resultsmentioning

confidence: 90%

“…It is evident that the cross-corrugated double-pass solar air collector delivers greater economic and technical feasibility due to a greater and useful energy gain, albeit at the expense of a reduced amount of power consumption, as shown in Figures 13-15. The extents of collector efficiency improvements were more significant with the recycle ratios than those in the V-corrugated device of the same operational conditions [41]; thus, a higher value of I C,A /I P,A is obtained by operating double-pass crosscorrugated solar air collectors with external recycling, as demonstrated in Figure 15. With those comparisons, the advantage of the cross-corrugated design for solar air collectors is evident.…”

Section: Discussionmentioning

confidence: 89%

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Optimizing Thermal Efficiencies of Double-Pass Cross-Corrugated Solar Air Heaters on Various Configurations with External Recycling

Chang

Hsiao

et al. 2021

Energies

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The effect of external-recycle operations on the thermal performance of double-pass cross-corrugated solar air heaters (SAH) under different operating conditions was investigated experimentally and theoretically. Additionally, the simultaneous ordinary equations were solved analytically for each proposed configuration. Four recycling types are introduced for improving the solar thermal performance with different external recycle processes, which are expected to enhance the heat transfer coefficient with a convective turbulent flow between the air and the absorber in the present study. Using recycling double-pass operations, two processes were conducted sequentially: air first flowed over the sinusoidal corrugated absorber plate and then flowed back later over the transverse sinusoidal corrugated bottom plate. Improved device performance was achieved due to the doubled heat transfer area over and under the corrugated absorber plate, from which both the sinusoidal cross-corrugated absorber plate and bottom plate enhanced turbulent intensity. Theoretical predictions and experimental results both indicated that the recycle ratio increased with the SAH thermal efficiency for all proposed designs. The results show a higher heat transfer efficiency for the proposed four configurations using wavelike corrugated plates compared to those conducted in single-pass and flat-plate absorber plates with up to a maximum 133% (from 0.301 to 0.703) increment. The optimal device performance was examined for all external-recycle configurations under the same working dimensions and operational conditions. The best configuration for optimal thermal performance was the device that lengthened the air flow pathway and increased the air velocity within the collector; thus, a higher heat transfer rate was accomplished. The evaluation of increments in the power consumption and of the heat-transfer efficiency enhancement together determined the optimal design based on an economic consideration across various configurations of cross-corrugated double-pass devices.

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Section: Resultsmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 89%

Optimizing Thermal Efficiencies of Double-Pass Cross-Corrugated Solar Air Heaters on Various Configurations with External Recycling

Chang

Hsiao

et al. 2021

Energies

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“…It was also noted that enhancing the wind velocity and Reynold number caused a reduction in the overall temperature of the collector. Ho and Hsiao [117] found that the performance of SACs was enhanced using a V-groove stainless steel absorber, and the recycling ratio increased from 0.25 to 2. El-Sebaii and Aboul-Enein [37] found that the overall heat losses were reduced using a V-corrugated solar air collector compared to a Zulkifle and Alwaeli [116] found that the Fresnel lens outperformed the glass cover in terms of the outlet air temperature and thermal efficiency using a V-groove as the absorber.…”

Section: 𝑒 𝐷mentioning

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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“…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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Efficiency of Recycling Double-Pass V-Corrugated Solar Air Collectors

Cited by 13 publications

References 19 publications

Optimizing Thermal Efficiencies of Double-Pass Cross-Corrugated Solar Air Heaters on Various Configurations with External Recycling

Optimizing Thermal Efficiencies of Double-Pass Cross-Corrugated Solar Air Heaters on Various Configurations with External Recycling

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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