A slit-and -expanded aluminum-foil matrix solar collector

Chiou, J. P.; El-Wakil, M. M.; Duffie, John A.

doi:10.1016/0038-092x(65)90206-9

Cited by 89 publications

(27 citation statements)

References 2 publications

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“…Higher absorber surface temperature boosts the convective and radiative top heat losses. These results demonstrate a very good agreement with many other researchers' investigations [4,11].…”

Section: Resultssupporting

confidence: 93%

“…In porous type, absorbing the solar radiant heat and the heat convection between air and the absorber can effectively strengthen the air that passes through the collector absorber which improve the quality of heat transfer coefficient and thermal efficiency, therefore it would be better in thermal characteristics in comparison with nonporous absorber collector [3]. Porous absorber plates have been studied in different studies such as absorber made of aluminum foil cutted [4], wire nets [5,6], retail glass [7], pieces of coal [8], hollow spheres [9], pages made of black synthetic fiber [10], and thick black cotton fabric [11]. The advantage of porous absorber is attributed to the lower thermal energy dissipation to environment due to absorption and penetration depth of solar radiation [1].…”

Section: Introductionmentioning

confidence: 99%

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Designing and Evaluating an Innovative Solar Air Collector with Transpired Absorber and Cover

Zomorodian

Zamanian

2012

ISRN Renewable Energy

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Applying solar collectors is a popular tool for harnessing solar energy. In this work, a flat plate solar air collector was investigated under direct solar radiation in an endeavor to enhance the thermal efficiency of solar air collector with a slatted glass cover, perforated absorber aluminum sheets (porosity 0.0177, 0.0314 and absorber thickness of 1.25, 2.5 mm) which is the most suitable for a solar dryer. The effects of porosity and thickness on absorber performance of collector were evaluated. Six levels of air mass flow rates (0.0056 to 0.0385 kg m −2 s −1 ) were adopted. The tests were conducted in three replications on very clear sky days in September and October. The experimental results showed that thermal efficiency of collector was increased by an increase in the porosity of the absorber. The absorber with lower porosity showed a better thermal efficiency at lower air mass flux. In the minimum air flow rate, absorber efficiency with porosity 0.0177 and 0.0314 was 0.31 and 0.29, respectively, whereas at the maximum flow, efficiency showed an enormous change of 0.83 and 0.88, respectively. This solar air heater can be used for drying agricultural products, heating the space of greenhouse, and so forth.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Designing and Evaluating an Innovative Solar Air Collector with Transpired Absorber and Cover

Zomorodian

Zamanian

2012

ISRN Renewable Energy

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“…(i) The incident radiation is absorbed exponentially in depth, with an extinction coefficient which is fairly constant [5,8].…”

Section: Radiationmentioning

confidence: 99%

“…(ii) The packed bed is an isotropically homogeneous semi-transparent (allowing light to pass through diffusely) bed [5,8] for incident radiation.…”

Section: Radiationmentioning

confidence: 99%

“…The use of porous materials, such as slit-and-expanded aluminum foil matrix [5][6][7], wire-screen matrix [8][9], hollow spheres [10], iron chips [11,12] as heat absorbing media in air-cooled solar collector has also been proposed and tested in order to improve the collector performance. Mishra and Sharma [13] tested the performance of solar air heater having its bed packed with iron-chips, aluminum chips and pebbles and reported that the performance of plane collectors improves appreciably by packing the duct with blackened metallic materials.…”

Section: Introductionmentioning

confidence: 99%

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Performance analysis of optically semi-transparent material packed-bed solar air heater

Chouksey

Sharma

2017

International Journal of Thermodynamics

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This paper deals with theoretical analysis of performance of solar air collector having its duct packed with optically semitransparent materials. The heat transfer equations for two dimensional fully developed fluid flows under quasisteady state conditions have been developed in order to analyze the thermal, thermo-hydraulic and exergy performance and to study the effect of system and operating parameters. A computer programme is developed in C ++ language to estimate the temperature rise of entering air for evaluation of performance by solving the governing equations numerically using relevant correlations for heat transfer coefficient for packed bed systems. Results of air temperature rise and thermal efficiency obtained from the analysis have been compared with available experimental results and results are found fairly in closed agreement. It has been found that there is considerable enhancement in thermal efficiency with packed bed collector. Effect of total bed depth on efficiency show that there is an upper limiting value of total bed depth beyond which the thermal efficiency begins to fall again and this type of characteristics behavior is observed at all mass flow rate. It is also noticed that there exists an optimal value of effective and exergy efficiencies for a given mass flow rate.

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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

Hachemi

1999

Int. J. Energy Res.

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A slit-and -expanded aluminum-foil matrix solar collector

Cited by 89 publications

References 2 publications

Designing and Evaluating an Innovative Solar Air Collector with Transpired Absorber and Cover

Designing and Evaluating an Innovative Solar Air Collector with Transpired Absorber and Cover

Performance analysis of optically semi-transparent material packed-bed solar air heater

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

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