Experimental and CFD investigation of convection heat transfer in solar air heater with reverse L-shaped ribs

Gawande, Vipin B.; Dhoble, Ashwinkumar S.; Zodpe, D. B.; Chamoli, Sunil

doi:10.1016/j.solener.2016.02.040

Cited by 227 publications

(48 citation statements)

References 31 publications

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“…Experimental and numerical study of forced convection heat transfer of air in a solar air heater with reverse L-shaped ribs has been carried out. Where, Gawande et al have studied the thermal performance of solar air heater in terms of design variables [18]. Numerous studies in the literature have been focused on the application of CFD in the design of solar air heater and simulate fluid flow through it.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of a Longitudinal Solar Dryer in Semi-Arid Area; Case Study

Bouhdjar¹,

Hanini²,

Boualit³

et al. 2019

I2M

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A numerical simulation to predict the thermal performance of a longitudinal solar dryer has been carried out. For this, a mathematical model, based on the finite element method, has been developed to evaluate the thermal behavior of the solar dryer using a control system. The main objective of the used control system is to maintain the drying temperature inside a suitable range for the product to dry, under varying weather conditions, over the time drying process. This is achieved through many different steps. As, an example, at the beginning of drying process when solar radiation is low, the air flow rate at the inlet varies between Re=25 and Re=85. In other hand, when solar radiation is higher, fresh air is injected. The outcomes of simulation work showed that the obtained results are generally satisfactory. Nonetheless, this model can be further refined to obtain better results, as a more stable gradient temperature, over the full drying period. Moreover, it is worthy mentioned that thermal storage system can be combined with the studied solar drier, in the way to compensate the heat insufficiency, during low solar radiation days.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of a Longitudinal Solar Dryer in Semi-Arid Area; Case Study

Bouhdjar¹,

Hanini²,

Boualit³

et al. 2019

I2M

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show abstract

“…They concluded that as the Reynolds numbe0mnr increases, the Nusselt number correspondingly increases while the friction factor subsequently decreases. Another study by Gawande et al [2] investigating the heat transfer in solar air heater with reverse L-shaped ribs concluded that the average Nusselt number increases with increasing Reynolds number and also that the average Nusselt number increases with decreasing roughness pitch (P/e) for constant height of the roughness (e/D). Certain other studies have pointed towards using corrugated absorber plates.…”

Section: Introductionmentioning

confidence: 99%

Augmentation of Effective Thermal Gain of Solar Air Heater using a Novel Turbulator Design- A CFD Study

Dhagat

Manjunath

2018

MATEC Web Conf.

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Abstract. Augmentation of thermal performance of solar air heater has been the focus of many researchers over the last decades and the use of turbulator or artificial roughness to provide increased fluid mixing in order to achieve augmented heat transfer has been a widely accepted technique. This work aims to evaluate the effect of a novel turbulator design on the effective thermal performance of solar air heater using the methodology of computational fluid dynamics (CFD). A two dimensional CFD analysis is carried out to evaluate the thermal characteristics of solar air heater at various flow Reynolds number conditions for different geometric parameters of the proposed turbulator design. The pitch of the turbulator is varied as 10mm, 20mm, 30mm, 40mm and 50mm for a fixed turbulator height of 2 mm. The Reynolds number is varied from 6,000 to 27,000. The analysis shows that the lower values of pitch produces higher improvement in heat transfer. The maximum increase in Nusselt number is found to be about 2.98 times as compared to the base model for the flow Reynolds number of about 6000. The highest increase in the friction factor is found to be about 3.05 times relative to the base model. The maximum thermal enhancement factor is found to be about 1.99 for the pitch value of 10 mm at a flow Reynolds number of about 6000.

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“…Many works proved the significance of using artificial roughness at different geometries such as different shapes of ribs [18][19][20][21], obstacles [22,23] and arc wires and protrusions [24,25]. Furthermore, artificial roughness can be added to the sides of SAH which give more enhancement according to [26,27].…”

Section: Introductionmentioning

confidence: 99%

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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Experimental and CFD investigation of convection heat transfer in solar air heater with reverse L-shaped ribs

Cited by 227 publications

References 31 publications

Numerical Study of a Longitudinal Solar Dryer in Semi-Arid Area; Case Study

Numerical Study of a Longitudinal Solar Dryer in Semi-Arid Area; Case Study

Augmentation of Effective Thermal Gain of Solar Air Heater using a Novel Turbulator Design- A CFD Study

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

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