The influences of recycle on performance of baffled double-pass flat-plate solar air heaters with internal fins attached

Ho, Chii‐Dong; Yeh, Ho‐Ming; Cheng, Tung-Wen; Chen, T.C.; Wang, R.C.

doi:10.1016/j.apenergy.2008.12.013

Cited by 97 publications

(24 citation statements)

References 19 publications

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“…The thermo-hydraulic efficiency of a FCSAH using pin-fin absorber plate packed with paraffin wax is around 36 % higher when compared to the flat absorber plate making it as feasible. The pressure drop in the pin-fin absorber plate was found to be lower due to the absence of sharp edges when compared to the other absorber plate configurations using extended surfaces such as obstacles [17,18], ribs [19], baffles [20,21], V-corrugated absorber plates [22] and aluminum cans [23] reported in the literature. However, further research investigation is required to optimize the pin-fin dimensions and spacing to improve the thermo-hydraulic efficiency.…”

Section: Pressure Drop Across the Air Heatermentioning

confidence: 80%

“…Similarly, the performance was improved by placing extended surfaces such as obstacles in different shapes [17,18], different forms of ribs [19], baffles and longitudinal fins [20,21], corrugated absorber plates [22] and recyclable aluminum cans [23]. However, the extended surfaces reported in the literature are having more aerodynamic resistance due to the presence of sharp edges, which results in more pressure drop across the ducts of solar air heaters.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic performance of forced convection solar air heaters using pin–fin absorber plate packed with latent heat storage materials

Kumar

Babu²,

Mohanraj

2016

J Therm Anal Calorim

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In this work, the thermodynamic performance of a forced convection solar air heater (FCSAH) was evaluated using two different absorber plate configurations, namely a flat absorber plate and a pin-fin absorber plate packed with latent heat storage material (paraffin wax). The experiments were carried out under the meteorological conditions of Coimbatore city in India. The parameters such as outlet air temperature, thermo-hydraulic efficiency and exergy efficiency were evaluated with reference to solar intensity, ambient temperature and ambient wind velocity. An artificial neural network (ANN) model was developed to simulate the thermodynamic performance of a FCSAH using flat absorber plate and pin-fin absorber plate packed with paraffin wax to have a realistic performance comparison. The ANN-predicted results are found to be closer to the experimental values with a maximum fraction of absolute variance, minimum root-mean-square errors and minimum coefficient of variance. The results showed that the pin-fin absorber plate packed with paraffin wax has additional heat storage for the period of 3 h with 2-5°C enhanced outlet air temperature when compared to the flat absorber plate. The FCSAH using pin-fin absorber plate packed with paraffin wax has 3-35 % higher thermo-hydraulic efficiency with 2-15 % higher exergy efficiency when compared to the flat absorber plate. The results confirmed that pin-fin absorber plate packed with paraffin is a good option to enhance the thermodynamic performance of a FCSAH.

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Section: Pressure Drop Across the Air Heatermentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Thermodynamic performance of forced convection solar air heaters using pin–fin absorber plate packed with latent heat storage materials

Kumar

Babu²,

Mohanraj

2016

J Therm Anal Calorim

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“…The results of experimental and numerical investigations show that heat transfer enhancement is achieved by employing baffled double-pass procedures with external recycling and fins attached on both sides of the absorber plate [1]. 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].…”

Section: Introductionmentioning

confidence: 96%

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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“…Decreasing fins spacing and increasing fins height enhances the thermal and thermohydraulic efficiencies by 114.1 and 112.65 %, respectively as concluded in [9]. Also, recycling process with various reflux ratios was studied to obtain the ratio which achieves the best performance of finned SAHs [11][12][13]. Furthermore, Other shapes of fins can also be used to enhance the performance of SAHs like wavy fins [14,15] and v-corrugated fins [16,17] with enhancement in effeciency for both single and double pass SAHs.…”

Section: Introductionmentioning

confidence: 96%

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

et al. 2018

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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.

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The influences of recycle on performance of baffled double-pass flat-plate solar air heaters with internal fins attached

Cited by 97 publications

References 19 publications

Thermodynamic performance of forced convection solar air heaters using pin–fin absorber plate packed with latent heat storage materials

Thermodynamic performance of forced convection solar air heaters using pin–fin absorber plate packed with latent heat storage materials

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

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

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