Experimental performance of single and double pass solar air heater with fins and steel wire mesh as absorber

Omojaro, A.P.; Aldabbagh, L.B.Y.

doi:10.1016/j.apenergy.2010.06.020

Cited by 237 publications

(109 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Different shapes of fins have been studied. First, longitudinal fins which was studied by many researchers either experimentally [6][7][8] or theoretically [9,10]. The results of such studies confirmed that attaching fins to the absorber plate improves the performance of SAH as they have higher heat transfer area and lower irreversibility compared to flat plate SAH.…”

Section: Introductionmentioning

confidence: 48%

Influence of bladed and glazed entrance on the performance of solar air heaters

et al. 2018

View full text Add to dashboard Cite

The performance of a flat plate single-pass Solar Air Heater (SAH) modified at the entrance region was experimentally investigated. This entrance region was covered with glass cover instead of steel. Using glass at the entrance region increases the heating area exposed to solar radiation and avoids the restriction of solar radiation from reaching this area as in case of steel cover. Also, guide blades were placed in the entrance region to ensure well air distribution on the absorber surface and hence enhancing the thermal performance of SAH. The modified SAH was compared with another of conventional entrance. The experiments were performed at four air flow rates ranged from 0.013 to 0.04 kg/s. The modifications led to good enhancement in both the air temperature difference and the efficiency. For the daily efficiency, the maximum values are 43.43, 40.48 and 32.92 % for the glazed-bladed entrance SAH, glazed entrance SAH and conventional SAH, respectively, at the rate of 0.04 kg/s. The glazed-bladed SAH showed a good improvement in the daily thermal efficiency by 6.72 to 10.5 % over the conventional heater and by 2.16 to 3.25 % over the glazed SAH.

show abstract

Section: Introductionmentioning

confidence: 48%

Influence of bladed and glazed entrance on the performance of solar air heaters

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The thermal efficiency of a double-pass GUC with fins packed with wire mesh, instead of an absorber plate, is found to be higher than the single pass by 7-19.4% [2]. The results of a double-pass GUC, designed and constructed by Wazed et al [3], with forced and natural air flows demonstrate that the maximum temperature rise for forced circulation is 12.25°C and 8.5°C for natural circulation.…”

Section: Introductionmentioning

confidence: 82%

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

View full text Add to dashboard Cite

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.

show abstract

“…However, the thermal efficiency was found to decrease by increasing the height of the first pass for the double pass solar air collector. The experiment by Omojaro and Aldabbagh (2010) showed that, there was an increase of collector efficiency by 4.7% when reducing the height of first pass from 7 to 3 cm. Ramadan et al (2007) suggested using double pass solar air collector with air passing above the absorber plate before turning to pass below it.…”

Section: Influence Of Air Flow Patternsmentioning

confidence: 99%

“…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. 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.…”

Section: Influence Of Air Flow Patternsmentioning

confidence: 99%

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

Ramadhani¹,

Minja²,

Njau³

2015

Afr. J. Agric. Res.

View full text Add to dashboard Cite

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.

show abstract

Experimental performance of single and double pass solar air heater with fins and steel wire mesh as absorber

Cited by 237 publications

References 21 publications

Influence of bladed and glazed entrance on the performance of solar air heaters

Influence of bladed and glazed entrance on the performance of solar air heaters

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

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

Contact Info

Product

Resources

About