CFD Numerical Investigation of a New Solar Flat Air-Collector Having Different Obstacles with Various Configurations and Arrangements

Rouissi, Walid; Naili, Nabiha; Jarray, Mohamed; Hazami, Majdi

doi:10.1155/2021/9991808

Cited by 3 publications

(4 citation statements)

References 29 publications

(35 reference statements)

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“…For solar air collectors, the average Nu is calculated by Eq. 7 (Choi H and Choi K 2020;Rouissi et al 2021 The percentage between the thermal power that is actually transferred to air and the maximum theoretical power is referred to as the thermal efficiency of SAC and can be written by Eq. 9 (Rouissi et al 2021): (9) where (Eq.…”

Section: Data Reduction and Grid Independencementioning

confidence: 99%

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Performance Enhancement of a Solar Air Collector Using a V-Corrugated Absorber

Abed

Dahham²,

Hashim

et al. 2023

J. Aerosp. Technol. Manag.

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Solar energy is one of the most efficient forms of renewable energy. Solar air collectors are promising utilization of solar energy. The present study used unsteady three-dimensional Computational Fluid Dynamic (CFD) analysis to investigate the heat transfer and fluid friction in solar air collectors with smooth and v-corrugation absorber plates. The studied parameters are Reynolds number, v-corrugation height, and pitch. Three Reynolds number (500, 1000, 1500) values were used with three arrangements configuration of the v-corrugation of relative heights of 0.10, 0.16, and 0.23. Roughness pitches varied between 1.33, 1.66, and 2. By comparing the simulated thermal efficiency with the currently known experimental values, great agreement can be approved. Results show the superiority of the performance of v-corrugated collector against the traditional or smooth type. The outlet temperature obtained in case of relative roughness height = 0.23 and relative roughness pitch = 2 is 61 °C, while it is 53 °C for a smooth type. Also, a higher thermal efficiency of 46.7 % can be obtained compared to 33.01% for smooth type.

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Section: Data Reduction and Grid Independencementioning

confidence: 99%

“…The following thermophysical properties, which hold true for temperature ranges between 280 and 470 K, will be incorporated into the present model for the accuracy of the simulation results (Eqs. 12-15)(Rouissi et al 2021):…”

mentioning

confidence: 99%

Performance Enhancement of a Solar Air Collector Using a V-Corrugated Absorber

Abed

Dahham²,

Hashim

et al. 2023

J. Aerosp. Technol. Manag.

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“…The governing equations considered in the present CFD analysis are based on the following Navier-Stokes equations [20,31,32]:…”

Section: Mathematical Expressions For Cfd Modellingmentioning

confidence: 99%

Thermal and CFD Analyses of Sustainable Heat Storage-Based Passive Greenhouse Dryer Operating in No-Load Condition

Ahmad,

Prakash,

Sarangi

et al. 2023

Sustainability

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This article presents a comprehensive study on thermal and computational fluid dynamics (CFD) analysis of an innovative greenhouse dryer designed for passive operation under a no-load condition. The dryer incorporates hybrid thermal storage at the floor and a reflective mirror with thermocoal as the north wall, transforming a classical even-span greenhouse dryer into an efficient and effective system. The experimentation was conducted under clear sky conditions, with variations in global solar radiation (GSR) ranging from 166.6 to 1209 W/m2, resulting in an average value of 875.9 W/m2. The variations in GSR influenced other ambient parameters, including ambient temperature (28.7 °C to 35.6 °C), ambient relative humidity (33.2% to 45.7%), and ambient wind speed (0.1 to 1.02 m/s). Indoor parameters of the proposed dryer, such as inside temperature (31 °C to 47.35 °C), inside relative humidity (31.1% to 39.1%), ground temperature (44.2 °C to 70.6 °C), and outlet temperature (29 °C to 45.35 °C), were measured hourly. The average values of these parameters were 41.25 °C, 35.31%, 61.65 °C, and 39.25 °C, respectively. Quantitative parameters, including heat loss, overall heat transfer coefficient, coefficient of diffusion, and instantaneous efficiency, were calculated to evaluate the dryer’s performance. The proposed dryer exhibited an improved range of overall heat transfer coefficients (3.87 to 5.03 W/m2 K) compared to the modified greenhouse dryer under passive mode and the conventional greenhouse under passive mode. CFD analysis provided temperature distribution plots showing a progressively increasing range of temperatures near the trays, ranging from 310 K to 335 K, suitable for natural convection drying. The findings highlight the superior performance of the innovative dryer compared to contemporary systems. This research contributes to the advancement of drying technology and holds potential for applications in the agriculture and food processing industries.

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“…The authors found that the thermal efficiency increases continuously with an increase in fluid mass flow rate, whereas thermohydraulic efficiency increases up to an inception value of fluid mass flow rate, attains a maximum, and then decreases sharply for a given fin spacing and fin height. Also, considerable work has been done by Rouissi et al (2021). This study has focused on the effect of baffles and their orientation on the global thermal efficiency of the solar flat air collector.…”

Section: Introductionmentioning

confidence: 99%

Effect of Absorber Design on Convective Heat Transfer in a Flat Plate Solar Collector: A CFD Modeling

Flilihi¹,

Sebbar²,

Achemlal³

et al. 2022

Frontiers in Heat and Mass Transfer

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In this paper, we made a numerical simulation of convective heat transfer in a rectangular section pipe of a air flat plate solar collector using three forms of the absorber plate namely, simple shape, rectangular-shape, and half circle-shape. The flow is considered laminar and stationary, where the heat exchange between the absorber plate and the fluid takes place in useful area. The computer code in fluid dynamics, the fluent, is applied to integrate the governing equations on each control volume. A detailed description of the fluid flow and heat transfer in the rectangular channel was made. Several simulation were carried out in order to determine the influencing parameters allowing better performances of the collector and ensuring a good homogeneity of the temperature at the exit of the channel. The obtained results showed that the lows mass flow rates of the air increase the average outlet temperature. Also, the use of the second configuration of the absorber (rectangular shape) increases the velocity of the air at the downstream of the channel and promotes more the thermal homogeneity at the outlet of the channel.

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CFD Numerical Investigation of a New Solar Flat Air-Collector Having Different Obstacles with Various Configurations and Arrangements

Cited by 3 publications

References 29 publications

Performance Enhancement of a Solar Air Collector Using a V-Corrugated Absorber

Performance Enhancement of a Solar Air Collector Using a V-Corrugated Absorber

Thermal and CFD Analyses of Sustainable Heat Storage-Based Passive Greenhouse Dryer Operating in No-Load Condition

Effect of Absorber Design on Convective Heat Transfer in a Flat Plate Solar Collector: A CFD Modeling

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