Collector efficiency of double-flow solar air heaters with fins attached

Yeh, Ho‐Ming; Ho, Chii‐Dong; Hou, Jun-Ze

doi:10.1016/s0360-5442(02)00010-5

Cited by 121 publications

(45 citation statements)

References 14 publications

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“…These results were in agreement with the study of Yeh et al (2002) who outlines a considerable performance increase when employing a double-flow device instead of using a singleflow. It could be seen that, performance of single duct front pass collector (SDFP) was significant different compared to double duct parallel flow and double duct counter flow.…”

Section: Comparisons Of Means For Single and Double Pass Solar Collectorsupporting

confidence: 92%

“…Suggestions for this settings includes: air passing over absorber plate (single duct front pass-SDFP), air enter over absorber plate and exit below it (double duct counter flow-DDCF) and air passing in both sides of absorber plate (double duct parallel flow). Yeh et al (2002) reported that a considerable improvement in collector efficiency is obtained by employing a double-flow device instead of using a singleflow. The study of Omojaro and Aldabbagh (2010) suggests passing the air from above and below the absorber plate at the same time in a double-flow solar air heater.…”

Section: Influence Of Air Flow Patternsmentioning

confidence: 99%

“…The study of Omojaro and Aldabbagh (2010) suggests passing the air from above and below the absorber plate at the same time in a double-flow solar air heater. According to Yeh et al (2002), the best thermal efficiency can be achieved in a double-flow solar air heater when the cross-section area of upper and lower channels are constructed equally and at the same fixed mass flow rates. However, the thermal efficiency was found to decrease by increasing the height of the first pass for the double pass solar air collector.…”

Section: Influence Of Air Flow Patternsmentioning

confidence: 99%

See 2 more Smart Citations

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: Comparisons Of Means For Single and Double Pass Solar Collectorsupporting

confidence: 92%

Section: Influence Of Air Flow Patternsmentioning

confidence: 99%

Section: Influence Of Air Flow Patternsmentioning

confidence: 99%

See 1 more Smart Citation

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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“…It was observed that introducing obstacles in the air stream increases the absorber plate surface area [13]. Fins are employed in the SAH to extend the surface area of the absorber [14]. The results of attaching pin fins to the absorber plate of SAH indicate that the efficiency improves by 48% compared to SAH without fins [15].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Slit Spacing and Bed Height on the Thermal Performance of Slit-Glazed Solar Air Heater

Mousavi

Egelioğlu

2017

International Journal of Photoenergy

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The thermal performances of three slit-glazed solar air heaters (SGSAHs) were investigated experimentally. Three SGSAHs with different bed heights (7 cm, 5 cm, and 3 cm) were fabricated with multiple glass panes used for glazing. The length, width, and thickness of each pane were 154 cm, 6 cm, and 0.4 cm, respectively. Ambient air was continuously withdrawn through the gaps between the glass panes by fans. The experiments were conducted for four different gap distances between the glass panes (0.5 mm, 1 mm, 2 mm, and 3 mm) and the air mass flow rate was varied between 0.014 kg/s and 0.057 kg/s. The effects of air mass flux on the outlet temperature and thermal efficiency were studied. For the SGSAH with bed height of 7 cm and glass pane gap distance of 0.5 mm, the highest efficiency was obtained as 82% at a mass flow rate of 0.057 kg/s and the air temperature difference between the inlet and the outlet (ΔT) was maximum (27°C) when the mass flow rate was least. The results demonstrate that for lower mass flow rates and larger gaps, the performance of SGSAH with a bed height of 3 cm was better compared to that of others. However, for higher mass flow rates, the SGSAH with 7 cm bed height performed better.

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“…The performance range of flat plate solar collectors indicated by Yeh et al (2002) to a mass flow 38.52 kg/h, is 0.6 to 0.65 (Figure 11). According to Maiiti et al (2011), the yield increases with time in a dryer to a maximum of 60% in a heater plate.…”

Section: The Performance Of Collectormentioning

confidence: 99%

Thermal performance modelling of solar collector with heat storage

Tchaya

Kampel

Havet

et al. 2017

IJESMS

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Solar drying is used to reduce post-harvest losses. An indirect solar dryer with oriented air is presented. It provides the ability to store energy. This work predicts the outlet temperature at the collector in the single-face and bifacial modes of collector. The heat balance applied to each element is determined taking into account the temporal term which characterises storage in the material. The simulation is done using Matlab software. Both models of the collector are validated by comparing the experimental and theoretical curves. The results show that the two curves of outlet temperatures have the same profile when the global heat transfer coefficient loss is 2.94 W.m -2 .K -1 , the contact resistance between the absorber and the insulator is 0.025 W -1 .m2.K and the velocity is 0.2 m.s -1 . The contact resistance has a significant influence on the outlet air temperature but not accessible for controlling temperature compared to the velocity. G.B. Tchaya et al.Martin Kamta is an Associate Professor in Electronics at the University of Ngaoundere. His main range of scientific interests is physics of semiconductor devices, electronics and photovoltaic systems. He has published three articles in electron spin resonance (ESR) of defects in III-V materials, three articles in superconducting materials, one article and six communications about photovoltaic systems. He has supervised several PhD, several Master's degree theses and several Master engineering.Michel Havet received his Doctorate in Aerodynamics, Fluid Mechanics, Combustion and Thermal from the University of Poitiers in 1995. He is currently in charge of Food Process Engineering Department at ONIRIS, France. His research activities concern the aerodynamics and increased transfers in food processing. He has published close to 25 papers in refereed journals and has supervised several Masters and PhD theses.César Kapseu is a Professor of Process Engineering at the University of Ngaoundere. He has published close to 100 papers in refereed journals and is a holder of more than ten prestigious awards. He has supervised several Masters and PhD theses. He has equally held several posts of responsibilities at the University of Ngaoundere.

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Collector efficiency of double-flow solar air heaters with fins attached

Cited by 121 publications

References 14 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

Experimental Study of the Slit Spacing and Bed Height on the Thermal Performance of Slit-Glazed Solar Air Heater

Thermal performance modelling of solar collector with heat storage

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