Theoretical and experimental study of efficiency factor, heat transfer and thermal heat loss coefficients in solar air collectors with selective and nonselective absorbers

Hachemi, A.

doi:10.1002/(sici)1099-114x(19990625)23:8<675::aid-er505>3.0.co;2-f

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…The modifications to improve the heat-transfer coefficient between the absorber plate and air include the use of an absorber with fins attached, corrugated absorber, matrix type absorber, with packed bed, with baffles and different configurations are given in the literature [2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of thermal performance of solar air heater having different obstacles on absorber plates

Akpınar

Koçyiğit

2010

International Communications in Heat and Mass Transfer

124

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of thermal performance of solar air heater having different obstacles on absorber plates

Akpınar

Koçyiğit

2010

International Communications in Heat and Mass Transfer

124

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“…It consists of Plexiglas plate of 3 mm thick as transparent cover, which has been used instead of glass for the reason of flexibility despite of the degradation of its optical properties through frequent exposure to sun; black painted galvanized iron sheet of 1 mm thick and 1.28 m 2 collector area, which would be appropriate to be used as absorber plate in solar air heaters since no significant improvement of the collector efficiency can be achieved using selective materials (Hachemi 1999;Moummi et al 2004); polystyrene board of 40 mm thick used as back insulation layer; hardboard sheet (also known as masonite or isorel) of 3 mm thick as bottom plate which forms a smooth underside of the curved flow channel, and at the same time protects the polystyrene layer from possible damage due to the direct contact with hot air; plywood panel of 3 mm thick used as back cover; and a collector box that holds the different parts of the solar air heater together has been fabricated from single and double hardwood plank A c c e p t e d M a n u s c r i p t 7 with sidewalls of 22 mm thick. The back insulation layer is of 40 mm thick.…”

Section: Methodsmentioning

confidence: 99%

Experimental study of new solar air heater design

Mahboub

Moummi

Brima

et al. 2015

International Journal of Green Energy

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The suitable design is the most important key to a cost-effective solar air heater. Although, there are many techniques that have been proposed to improve the solar air heaters' performance by means of different turbulence promoters, they cannot ensure a compromise between the cost and the effectiveness. The aim of this study is to find simple and tolerable solution to get rid of the inconvenience resulting from the widely adopted heat transfer enhancement techniques by providing an optimized solar air heater design. The proposed design consists of a slightly curved smooth flow channel with an absorber plate of convex shape. A prototype of a curved solar air heater of 1.28 m 2 collector area was built and tested under summer outdoor conditions in Biskra (Algeria). The performance was evaluated in terms of thermal and effective efficiency for mass flow rates of 0.0172, 0.029 and 0.0472 kg/sm 2 . It is observed that the overall efficiency of this solar air heater is considerably higher in comparison with the efficiency range of the conventional smooth flat plate heaters reported in the literature for similar operating conditions.

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“…4 Many studies have been carried out to increase the efficiency of air collectors. Hachemi 5 discussed the heat loss and efficiency for selective and non-selective absorber plate solar air collectors. He found that the selectivity of the absorber plate would not play an important role in a well-insulated solar collector with a fan system that allows fully developed turbulent flow and high heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the efficiency of air heated solar collectors with different geometries by experimental method

Yildiz

Yılmaz

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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In this study, an experimental comparison of the thermal performances for four type of air-heated solar collectors was performed with different interior structures at various air velocities from 1 to 4 m/s within increments of 0.5 m/s. Collector with aluminum can, aluminum can-metal chip collector, aluminum can-paraffine collector, and baseline collector were used as air-heated solar collectors. According to the results, the average temperature difference in the aluminum can-metal chip solar collector was obtained as 54°C at 1.5 m/s, which is the highest average temperature difference among the collectors. For the solar collector with an aluminum can, the thermal efficiencies were 21% at 1 m/s and 31% at 1.5 m/s. The highest thermal efficiency was achieved as 53% at 4 m/s in the aluminum can-metal chip solar collector, while the aluminum can-paraffin solar collector reached the maximum value of 51% at 4 m/s.

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Theoretical and experimental study of efficiency factor, heat transfer and thermal heat loss coefficients in solar air collectors with selective and nonselective absorbers

Cited by 7 publications

References 11 publications

Experimental investigation of thermal performance of solar air heater having different obstacles on absorber plates

Experimental investigation of thermal performance of solar air heater having different obstacles on absorber plates

Experimental study of new solar air heater design

Investigation of the efficiency of air heated solar collectors with different geometries by experimental method

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