Performance enhancement of a double-pass solar air heater with a shot-blasted absorber plate and winglets

Kumar, P. Ganesh; Saravanakumar, Duraisamy; Balaji, K.; Salman, Mohammed D.; Kim, Sung Chul

doi:10.1007/s12206-021-0544-x

Cited by 19 publications

(2 citation statements)

References 47 publications

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“…The air's dynamic viscosity, thermal conductivity, specific heat, and density were all determined by taking an average of the air's entrance and exit temperatures into account. The methodology introduced by Kumar et al [25] allowed for a definition of the rate at which the heat was transferred:…”

Section: Data Calculationmentioning

confidence: 99%

Comparative Analysis of Thermal Performance in Dual-Flow Solar Air Heaters Utilizing Diverse Absorber Plates

Zubairi,

Danismaz,

Yasin

et al. 2023

IJHT

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This study undertakes an experimental and computational evaluation of a dual-flow solar air heater (SAH) equipped with three distinct types of absorber plates: flat, trapezoidal, and U-corrugated. Experiments were conducted under actual outdoor weather conditions in Baghdad, Iraq (33.31º N, 44.36º E) during varying days in April and May 2022. The collector, oriented south (surface azimuth angle = zero due south) and tilted at an angle of 30º from the horizontal, was scrutinized under four different airflow rates: 0.0011, 0.0023, 0.0036, and 0.0046 kg/s. Computational simulations of the four absorber plates were performed using ANSYS Fluent software to ascertain and validate thermal efficiencies and performance characteristics. Findings indicate that at an airflow rate of 0.0046 kg/s, the thermal efficiencies of the SAHs with flat, U-corrugated, and trapezoidal plates were 43%, 51%, and 54% respectively. Additionally, a shift from parallel to anti-parallel airflow direction resulted in an increased thermal efficiency from 51% to 56%. It was determined that the optimal configuration was achieved with the U-corrugated plate in an anti-parallel airflow. The average efficiencies at the maximum airflow rate of 0.0046 kg/s were reported as 42.80% for the flat plate, 51.33% for the U-corrugated plate with parallel airflow, 54.38% for the trapezoidal plate with anti-parallel airflow, and 55.53% for the Ucorrugated plate with anti-parallel airflow. Finally, a favorable alignment between the experimental and simulated results was observed, with an average discrepancy of 5.7% in thermal efficiency.

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Section: Data Calculationmentioning

confidence: 99%

Comparative Analysis of Thermal Performance in Dual-Flow Solar Air Heaters Utilizing Diverse Absorber Plates

Zubairi,

Danismaz,

Yasin

et al. 2023

IJHT

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“…Passive techniques involve creating roughness [17], inserting turbulators like winglets [18], dimples [19], fins [20], etc., or replacing conventional absorber plates with new types such as corrugated absorbers [21] triangular absorbers [22], etc.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance of a Counter-Flow Double-Pass Solar Air Heater With The Steady and Pulsating Flow

Hussein¹,

Ahmed²,

Ekaid³

2022

ETJ

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 The tubular solar absorber is placed perpendicularly to the direction of airflow.  Pulsating flow increases the thermal performance by up to 15.2%  Thermal performance is directly proportional to the pulsating frequency.The present work studied the influence of pulsating flow as an active method on the thermal performance of a double-pass solar air heater with a tubular solar absorber. A ball valve has been used as a pulse generator mounted at the downstream flow of the solar air heater. The experiments were under indoor conditions with a constant heat flux of 1000 W/m 2 , and different air mass flow rates ranged from 0.01 to 0.03 kg/s. Moreover, the study covered three pulsation frequencies varied from 1 to 3 Hz. Based on the experimental outcomes, it can be observed that the heat transfer rate is enhanced by applying the pulsating flow, where it was found that the outlet temperature in the case of applying the pulsating flow rises by about 25.6 -27% as compared with the steady flow case. Moreover, pulsating flow offers a higher effective thermal performance by about 15.2 % at the maximum air mass flow rate compared with the steady flow. In addition, the findings pointed out that varying the pulsation frequency from 1 to 3 Hz produces an enhancement in heat transfer rate and in solar heater effective efficiency, where it was found that when changing the frequency from 1 to 3, the increment of effective efficiency ranged from 3.8 to 6.9 % depending on the air mass flow value.

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Effect of the base angle of an isosceles obtuse-angled trapezoidal duct of a solar air heater on fluid flow and thermal characteristics – an experimental and computational investigation

Dara,

Muvvala

2024

J Mech Sci Technol

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Performance enhancement of a double-pass solar air heater with a shot-blasted absorber plate and winglets

Cited by 19 publications

References 47 publications

Comparative Analysis of Thermal Performance in Dual-Flow Solar Air Heaters Utilizing Diverse Absorber Plates

Comparative Analysis of Thermal Performance in Dual-Flow Solar Air Heaters Utilizing Diverse Absorber Plates

Thermal Performance of a Counter-Flow Double-Pass Solar Air Heater With The Steady and Pulsating Flow

Effect of the base angle of an isosceles obtuse-angled trapezoidal duct of a solar air heater on fluid flow and thermal characteristics – an experimental and computational investigation

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