Performance investigation of single- and double-pass solar air heaters through the use of various fin geometries

Labed, Adnane; Moummi, Noureddine; Benchabane, Adel; Aoues, Kamel; Moummi, Abdelhafid

doi:10.1080/14786451.2011.590899

Cited by 19 publications

(14 citation statements)

References 22 publications

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“…The second configuration of an artificial roughness is selected from a study prepared previously by A. Labed et al and S. Youcef-Ali [40][41][45][46]. The role of this roughness is the spread of air inside the rectangular duct absorber and the stimulation of the heat transfer between the air heater and the absorber Fig.…”

Section: The Second Case Studymentioning

confidence: 99%

“…Labed et al and S. Youcef-Ali [40][41] carried out an experimental investigation to study the critical role of the use of roughness under different air mass flow with three types of roughness including the type used in the present study. O. Mahfoud et al, through a dynamic and thermal simulation, found that the use of roughness increases the heat transfer by 23% [42] in the flat plate solar air heater collector.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation and exergy analysis of an air heater with a solar concentrator used for drying processes

Karoua¹,

Moummi²,

Hamidat³

et al. 2018

IJHT

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In this paper, a solar air heater collector is developed and investigated. A concentrating feature of Linear Fresnel Reflector and the characteristics of flat plate air heaters (LFRAH) collectors are used. In this experimental study, three configurations of the absorber used to improve the thermal performance of LFRAH for the drying and the space heating processes, where two configurations of the absorber plate have different types of artificial roughness and the third configuration has a smooth absorber. The measured parameters are the ambient temperature, inlet and outlet temperatures of the air heater, the temperatures of the absorber, and the solar radiation intensity. The measurements performed at the same values of mass flow rate, 0.018 (kg.s -1 ). The introduction of the artificial roughness at the absorber plate allows having average air temperatures greater than 100° C. The comparison of the thermal efficiency shows that the roughened absorbers improve the thermal efficiency by 62% compared to the smooth absorber.

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Section: The Second Case Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental investigation and exergy analysis of an air heater with a solar concentrator used for drying processes

Karoua¹,

Moummi²,

Hamidat³

et al. 2018

IJHT

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“…The Hottel–Whillier–Bliss equation, Q U = F R A C [( τα ) I G − U L ( T in − T a )], models the heat gain (and thus the efficiency) of an individual panel under steady‐state conditions at ambient air temperature T a as the outcome of three compounded factors: the collector heat removal factor, F R ; the effective transmittance‐absorptance product, τα ; and the overall heat loss coefficient, U L …”

Section: Technology Applications In the Building Environmentmentioning

confidence: 99%

“…three compounded factors:t he collector heat removal factor, F R ;t he effective transmittance-absorptance product, ta;a nd the overall heat loss coefficient, U L . [16] Improvements in the last decadeh ave concerned the absorber material geometry to enhance absorption, optical transparency of the glazing cover material, thermal insulation on the back of the panel to minimize heat losses,a nd the intake of fresh air to the panel. In general, the absorber solar absorptivity,g lazing transmissivity,a nd wind speed have the strongest effects on the final performance.…”

Section: Glazedc Ollectorsmentioning

confidence: 99%

Solar Air Heating and Ventilation in Buildings: A Key Component in the Forthcoming Renewable Energy Mix

et al. 2017

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The achievements of the last two decades in using solar energy for naturally ventilating and heating buildings of any size and scope across the world are remarkable, though comprising a niche market and being generally poorly known to this point. Air quality, thermal and hygrometric comfort, and reduced energy costs are some of the benefits provided by solar ventilated spaces. We identify the remaining hurdles to be addressed prior to forthcoming widespread adoption of this technology in the building environment across the world, well beyond the cold‐climate countries.

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“…In our laboratories, several theoretical and experimental investigations were carried out on the enhancement of thermal performances of SAHs designed for drying, heating and cooling applications [15][16][17][18][19][20][21][22]. In all these studies, the authors were used different form of obstacles mounted under the absorber plate on the air channel duct.…”

Section: Introductionmentioning

confidence: 99%

EXPERIMENTAL ANALYSIS OF HEAT TRANSFER IN THE FLOW CHANNEL DUCT OF SOLAR AIR HEATERS (SAHs)

Labed¹,

Moummi²,

Benchabane³

et al. 2015

IJHT

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This paper presents an experimental comparative study on the thermal performance and heat exchange of two single pass solar air heaters models (SAHs); we have proceeded to reversing the flow direction in the solar air heater. Initially, to determine the best performing model and to improve the efficiency factor of the SAH. Secondly, to evaluate the convective heat transfer coefficient of both models, named: N-1 and N-2. The indices (1) and (2) indicate, respectively, that the air was blown up or blown down in the channel duct of the SAH. Therefore, we have compared between the efficiencies, the convective heat transfer coefficient, Nusselt number curves and the distribution of air temperatures in the channel ducts of both solar air heaters. Both collectors were designed, constructed and tested in the University of Biskra (Algeria) in a stand facing south at an inclination angle equal to the local latitude. The results show that N-2 model (air blown down) is more efficient than N-1 model (air blown up), and the improvements in the heat exchange due to this technological solution are about 10-20%.

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Performance investigation of single- and double-pass solar air heaters through the use of various fin geometries

Cited by 19 publications

References 22 publications

Experimental investigation and exergy analysis of an air heater with a solar concentrator used for drying processes

Experimental investigation and exergy analysis of an air heater with a solar concentrator used for drying processes

Solar Air Heating and Ventilation in Buildings: A Key Component in the Forthcoming Renewable Energy Mix

EXPERIMENTAL ANALYSIS OF HEAT TRANSFER IN THE FLOW CHANNEL DUCT OF SOLAR AIR HEATERS (SAHs)

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