Thermal performance of double-pass counter flow and double-parallel flow solar air heater with V-grooved absorber plate

Rasham, Ali M.; Al-Bakri, Basim A. R.

doi:10.1088/1757-899x/1076/1/012081

Cited by 4 publications

(3 citation statements)

References 13 publications

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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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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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“…It was noticed that there is a slight rise in the pressure drop of the curved solar air heater compared with the flat one. A numerical study for thermal prediction of counter flow double-pass solar air heater was developed by Rasham and Alaskar [30]. The effect of absorber material and dimensions of air channels on the collector efficiency was studied.…”

Section: Introductionmentioning

confidence: 99%

Archive of Mechanical Engineering

Salih

2022

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A numerical investigation of thermal prediction of double-pass solar air heater of-counter flow is developed in the present study. The main idea of the current study is that the collector consists of two layers of glass so that the middle layer is glass instead of the usual metal plate. The performance of double-pass solar air heater is studied for a wide range of solar radiation intensities (600, 750 and 900 W/m 2 ). A FORTRAN-90 program is built to simulate the mathematical model of double-pass solar air heater based on solving steady state two-dimensional Navier-Stokes equations and energy equation based on finite volume method. Turbulence effect is simulated by two equations 𝑘-𝜀 module. The results are compared with the results of a previous experimental study and a good agreement was found. From compression calculating efficiency of the present and traditional collector for each solar intensity, it was found that the efficiency of the current collector is higher than that of the traditional one, where the efficiency of the current collector at the solar intensity of (600, 750 and 900) W/m 2 are (0.529, 0.514 and 0.503), respectively, while those of the traditional collector (0.508, 0.492 and 0.481), respectively. In addition to this, the effect of the mass flow rate on the temperature difference of the current proposed collector was studied. Three values of the mass flow rate were studied (0.009, 0.018, and 0.027) kg/s at solar intensity of 750 W/m 2 . From this it was found that the temperature difference decreases with increasing mass flow rate. Accordingly, the efficiency decreases.

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“…k = 0.02624 − 0.0000758(T -27) Rasham and Alaskari [28] Viscosity μ = [1.983 − 0.00184(T − 27)] × 10 −5Rasham and Alaskari[28] …”

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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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Thermal performance of double-pass counter flow and double-parallel flow solar air heater with V-grooved absorber plate

Cited by 4 publications

References 13 publications

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

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

Archive of Mechanical Engineering

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

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