First Numerical Evaluation of the Thermal Performance of a Tubular Receiver Equipped With Raschig Rings for CSP Applications

Ebadi, Hossein; Allio, Andrea; Cammi, Antonio; Savoldi, Laura

doi:10.1115/power2021-65714

Cited by 3 publications

(3 citation statements)

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“…Thus, loose packing spots can provide enough space for vortex and high-speed flow formations, while stagnation zones can be observed whiten the dense packing areas. Results follow the conclusions derived in other works (Ebadi et al, 2021).…”

Section: Resultssupporting

confidence: 91%

Numerical Investigation of the Performance of a Solar Air Heater Equipped with a Packed Bed

Ebadi,

Cammi,

Savoldi

2022

Proceedings of EuroSun 2022 - ISES and IEA SHC International Conference on Solar Energy for Buildings and Industry

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In this work, a numerical study based on pore-scale CFD analysis has been carried out on a solar air heater equipped with intermittent packed beds. Hydraulic and thermal characteristics of the air were determined by testing a range of mass flow rates and various collector configurations, including one (SAH-M1), two (SAH-M2), and three (SAH-M3) packed beds. After the validation of the numerical simulations with general correlations, results showed that as the number of packed zones increases, the total pressure drop grows. As a result, the maximum pressure drop was obtained as 115 kPa for the collector with three packed zones, operating at Re ~ 1.3 × 10 5 . Detailed thermal analysis proved that the intermittent integration of packed beds has the potential to also increase the heat transfer exchange between each packed zone, improving the convection by 25% in the second zone to the first zone and 35% in the third zone to the second zone at Re ~ 1.3 × 10 5 . This enhancement effect can be attributed to the increase in the turbulence conditions of the fluid regime from one bed to the other. Evaluating the effects of design parameters showed that the bed spacing could not change the thermo-hydraulic characteristics significantly, while particles' randomness may only affect the pressure drop by 13%.

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Section: Resultssupporting

confidence: 91%

Numerical Investigation of the Performance of a Solar Air Heater Equipped with a Packed Bed

Ebadi,

Cammi,

Savoldi

2022

Proceedings of EuroSun 2022 - ISES and IEA SHC International Conference on Solar Energy for Buildings and Industry

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“…Wang et al [7] conducted a numerical investigation involving twisted porous tape and nanofluids in tubes, revealing substantial efficiency and heat exchange improvements when employing porous twisted tape, nanofluids, and triangular tubes. Experimental evidence supports the effectiveness of incorporating porous medium inserts, both inside [8] and outside [9] the absorber, in enhancing heat transfer. However, numerical studies in this regard remain limited.…”

Section: Introductionmentioning

confidence: 73%

“…The combination of nanofluids and porous medium inserts holds significant promise for enhancing thermal performance, as supported by several studies [6][7][8][9][10][11]. El-Shorbagy et al [6] demonstrated that optimal heat transfer in partially filled trapezoidal channels with porous media occurs when the aspect ratio is set at 0.3, and 90% of the channel is filled with porous material.…”

Section: Introductionmentioning

confidence: 94%

Computational Fluid Dynamics Analysis of Absorber Tube with Molten Salt-based Nanofluids and Porous Medium Inserts

Ying,

Yang,

2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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In the field of solar applications, the performance of the system is significantly influenced by the design of the absorber tube, including the composition of heat transfer fluids within it and its geometric configuration. This study presents a computational fluid dynamics (CFD) model that combines molten salt-based nanofluids with porous medium inserts within the absorber tube. Two distinct configurations of porous inserts are investigated: one attached to the tube wall, referred to as 'enhanced tube 1 (ET1),' and the other integrated into the core zone, denoted as 'enhanced tube 2 (ET2).' This research explores how the thickness of the porous medium in these two configurations impacts the thermal and hydraulic performance of the absorber tube when used with molten salt-based nanofluids. Parameters considered include flow and heat transfer characteristics, as well as a performance evaluation criterion. The thickness of the porous medium is found to play an essential role in the thermo-hydraulic performance of the receiver tube. Across all sizes of ET1, significantly better heat transfer performance is consistently observed when compared to all ET2 configurations. It is important to note that the introduction of porous inserts does result in an increase in pressure drop, which varies with the thickness of the inserts in both ET1 and ET2 configurations. Consequently, when evaluating the overall thermo-hydraulic performance, the ranking stands as ET1 > smooth tube > ET2. Additionally, the performance evaluation criterion of ET1 exhibits an initial increase, followed by a subsequent decrease as the thickness of the porous inserts varies. This pattern suggests the presence of an optimal thickness, with a radius of 0.1, that maximizes performance. This study might contribute to the performance improvement of the absorber tube used in solar applications.

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Experimental investigation on an air tubular absorber enhanced with Raschig Rings porous medium in a solar furnace

et al. 2023

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First Numerical Evaluation of the Thermal Performance of a Tubular Receiver Equipped With Raschig Rings for CSP Applications

Cited by 3 publications

References 0 publications

Numerical Investigation of the Performance of a Solar Air Heater Equipped with a Packed Bed

Numerical Investigation of the Performance of a Solar Air Heater Equipped with a Packed Bed

Computational Fluid Dynamics Analysis of Absorber Tube with Molten Salt-based Nanofluids and Porous Medium Inserts

Experimental investigation on an air tubular absorber enhanced with Raschig Rings porous medium in a solar furnace

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