Energy and exergy analysis of a new flat-plate solar air heater having different obstacles on absorber plates

Akpınar, Ebru Kavak; Koçyiğit, Fatih

doi:10.1016/j.apenergy.2010.05.017

Cited by 247 publications

(78 citation statements)

References 37 publications

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“…Most of these research were focused on; increasing the absorber plate characteristics; optimizing design parameters (Martín et al, 2011); reducing the heat loss from the collector by: insulating the collector box, applying special coats on the absorber plate, inserting trans-parent insulation material between the absorber plate and the glaze and applying antireflective coats on the glaze (Hobbi and Siddiqui, 2009). Also other techniques like using absorber with attached fins, corrugated absorber, absorber with packed bed and baffles have been reported in literature (Akpinar and Koçyiğit, 2010). In this study heat transfer in the collector were enhanced by varying the flow patterns of air.…”

Section: Heat Transfer From Absorber Plate To Airmentioning

confidence: 99%

Experimental analysis of air flow patterns in perfomance of flat plate solar collectors

Ramadhani¹,

Minja²,

Njau³

2015

Afr. J. Agric. Res.

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Solar drying is one of the promising methods of reducing post-harvest losses in rural areas. Studies have shown that, heat transfer mechanisms in a solar collector influences the performance of solar dryers. This study aims at improving heat transfer in flat plate solar collectors by designing different air flow patterns inside the collector. Three flat plate solar collectors were constructed by using Pterocarpus timber (Mninga) and tested for their effect in heat transfer at various flow patterns. Three different flow patterns namely: single duct front pass, double duct parallel flow and double duct counter flow were designed and tested. Experimental results show that collector efficiency of single duct front pass, double duct front pass and double duct counter flow were 30.6, 36.1 and 38.2% respectively. It was found that, double duct flow gives improved performance compared to single duct flow due to the increased heat transfer area. In additional, double duct counter flow showed superior performance compared to double duct parallel flow due to extended heat transfer area and the advantage of air preheating at the inlet which reduces heat losses through glazing. Through this study, it was concluded that, solar collector designs with double duct counter flow can improve collector performance for up to 8.3% compared to single duct front pass.

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Section: Heat Transfer From Absorber Plate To Airmentioning

confidence: 99%

Experimental analysis of air flow patterns in perfomance of flat plate solar collectors

Ramadhani¹,

Minja²,

Njau³

2015

Afr. J. Agric. Res.

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“…Solar air collectors, although they are a very important component of the solar dryer system, have not paid much consideration during dryer design and construction [15]. The effectiveness of flat plate solar collectors is a function of climatic conditions and design parameters such as the thickness of cover material, collector orientation, collector depth, type of absorber materials used and collector geometry [16] [17] [18]. Irrespective of many types of research on solar collectors, factors such as glazing thickness, type of absorbing materials and heat transfer mechanisms have not well been considered during collector construction [19].…”

Section: Indirect Solar Dryer Systemmentioning

confidence: 99%

Heat Transfer Optimization in Air Flat Plate Solar Collectors Integrated with Baffles

Bakari¹

2018

JPEE

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This paper presents an experimental analysis for comparisons of conventional flat plate solar collectors and collectors integrated with different numbers of baffles. Heat transfer between absorber plate and drying fluid (air) has been one of the major challenges in the design and operations of the indirect solar dryer systems. In this experiment, efficiency of air flat plate solar collector integrated with 2, 3, 4 and 8 baffles was studied and compared with the ordinary collector. The results showed that integrating solar collector with baffles significantly increased the efficiency of the system. It was noted that collector with 2, 3, 4 and 8 baffles had a mean efficiency of 29.2%, 31.3%, 33.1% and 33.7% respectively while with no baffles was 28.9%. The analysis showed that when there were less than four baffles in the collector, heat transfer was dominant over pressure drop and hence high efficiency. However, when the number of baffles exceeded four, the effect associated with an increase in pressure drop highly observed compared to heat transfer coefficient, thus resulted to insignificant increase in efficiency. Therefore, the optimum number of four baffles was commended for the designed model for optimum efficiency.

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“…The rapport paper presents the effect the mass flow rate and solar radiation in the location of Biskra city of Algeria on the solar collector with and without fins [11][12][13][14][15][16][17][18]. The rapport paper presents the results of an experimental investigation of the performance for a new flat plate solar air heater (SAH) with several obstacles (Type I, Type II, and Type III) and without obstacles (Type IV), and found the optimal value of efficiency was determined for the solar air heater with Type II absorbent plate in flow channel duct for all operating conditions and the collector supplied with obstacles appears significantly better than that without obstacles [19][20].…”

Section: Introductionmentioning

confidence: 99%

Parametric Study of to Design an Earth to Air Heat Exchanger with Experimental Validation

Hatraf

Chabane

Brima

et al. 2014

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Abstract. Geothermal energy uses an air ground exchanger to cool buildings with minimum of energy. The outlet air coming from this exchanger can be directly used for space cooling if its temperature is low enough. In this study we try to evaluate the profile of ground temperature to decide of the depth to bury the exchanger. Through modeling and experimentation, we try to evaluate the performance of a horizontal pipe used for cooling, for this finite differential method which consists on dividing the length of the exchanger on multiple equal segments and by the knowledge of initial and boundary conditions the profile of the air temperature is that carry out. The authors conclude that many parameters influence the performance of earth to air exchanger such as the nature of the ground, the ground depth diameter of the duct and the throughput flow.

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Energy and exergy analysis of a new flat-plate solar air heater having different obstacles on absorber plates

Cited by 247 publications

References 37 publications

Experimental analysis of air flow patterns in perfomance of flat plate solar collectors

Experimental analysis of air flow patterns in perfomance of flat plate solar collectors

Heat Transfer Optimization in Air Flat Plate Solar Collectors Integrated with Baffles

Parametric Study of to Design an Earth to Air Heat Exchanger with Experimental Validation

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