Experimental investigations on a cross flow solar air heater having perforated circular absorber plate for thermal performance augmentation

Shetty, Shreyas P.; Paineni, Akhil; Kande, Madhav; Madhwesh, N; Sharma, Neha; Karanth, K. Vasudeva

doi:10.1016/j.solener.2020.01.005

Cited by 43 publications

(11 citation statements)

References 24 publications

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“…The efficiency of a modified SAH by combining it with a heat storage part consisting of copper tubes filled with thermal storage fluid studied by Kalaiarasi et al, the modified SAH's average efficiency tended to be 67% in comparison to 40% for the same experiment without heat storage material at a flow rate of 0.027 kg/s (Kalaiarasi et al, 2020). Shetty et al, (2020) studied the performance of a SAH with a circular-shape absorber, the perforation holes' diameter and number affected the performance of the SAH, the results showed that the proposed design was the highest in thermal efficiency of 93% compared to 70% for conventional SAH. Ghritlahre et al, (2020) enhanced a SAH's thermal efficiency using arc-ribs attached to the flat absorber, the investigation showed that the highest thermal efficiency for downstream and upstream flow arrangements is 69% and 73% correspondingly.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Thermohydraulic Performance of Tubular Solar Air Heater

Midhat

Aljubury

2022

Int. J. Renew. Energy Dev.

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The thermohydraulic performance of a new design solar air heater (SAH) design was examined experimentally in this paper as a trial to improve the flat-plate SAH’s efficiency. A flat-plate solar air heater (FPSAH) and a jacketed tubular solar air heater (JTSAH) having similar dimensions were constructed to compare their thermal performance efficiencies. A band of Aluminum jacketed tubes were arranged side by side in parallel to the airflow direction to form the absorber of a jacketed tubular solar air heater (JTSAH). The experiments were accomplished at three mass flow rates (MFR)s: 0.011 kg/s. 0.033 kg/s, and 0.055 kg/s. Results revealed that the maximum temperature difference was obtained from JTSAH at 38°C in comparison to 32°C from the FPSAH at MFR of 0.011 kg/s. The thermal losses from the upper glass cover of the JTSAH were less than the same losses at the FPSAH due to the reduced absorber and glass temperatures of the JTSAH. The gained power was higher at the JTSAH than the FPSAH. At the JTSAH, at 0.055 kg/s MFR, the maximum average thermal efficiency obtained was 81%, and the maximum average thermos-hydraulic efficiency obtained was 75.61 %. It is noted that increasing the MFR increases the thermal efficiency, also, its optimum value rises the thermos-hydraulic efficiency to a specific optimum point. The pressure drop increases with the MFR and JTSAH compared to the FPSAH

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Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Thermohydraulic Performance of Tubular Solar Air Heater

Midhat

Aljubury

2022

Int. J. Renew. Energy Dev.

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“…Chauhan et al 31 experimentally proved that the geometric parameters have considerable influences on heat transfer characteristics. Shetty et al 32 investigated the thermo‐hydraulic efficiency of SAH using a perforated absorber with cross‐flow arrangement. In their study, they have concluded that the jet diameter of 8 mm offers higher efficiency and the efficiency has been improved with increasing in number of perforations.…”

Section: Introductionmentioning

confidence: 99%

“…The performance of SAH system by using the impinging jet air has been experimentally and theoretically investigated. [29][30][31][32][33] This kind of collector is designed by inserting a plate with holes under the absorber plate to supply the impacting jet of air with various velocity corresponds to holes size and air mass flowrate. The results illustrated that the use of impinging jets promotes the SAH performance by extracting a considerable amount of heat.…”

Section: Introductionmentioning

confidence: 99%

Improving the performance of solar air heater using a new model of V‐corrugated absorber plate having perforations jets

Maher

Salih

2022

Intl J of Energy Research

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Summary An experimental investigation on the performance of a solar air heater (SAH) system has been performed using a new model of v‐corrugated absorber plate having perforations jets. The effectiveness of new model has been compared with the conventional v‐corrugated absorber plate under identical operating conditions to display the effectiveness of new model. The new collector has been referred to Model‐1, whereas the conventional model has been referred to Model‐2. The experimentations have been conducted in December 2020. The results demonstrate that the performance of Model‐1 is considerably higher than Model‐2 by 9%, 11%, and 11.5% for the air mass flowrates 0.01, 0.015, and 0.02 kg/s, respectively. As mass flowrate is increased, the performances of both models have increased, where the highest efficiencies of Model‐1 and Model‐2 have been found 84.5% and 73%, respectively. A substantial difference in temperature has been found in Model‐1 as compared to the rest model. Regardless of the air velocity values, the maximum outlet temperatures have been found in Model‐1, whereas the peak plate temperatures have been observed in Model‐2. The improvement in the performance of Model‐1 confirms that the utilize of perforations jets v‐corrugated absorber plate has an extreme action on the rate of heat transfer.

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“…The use of pin fins resulted in a 3%–12% increase in thermal efficiency. Shetty et al 22 investigated the performance of perforated spherical flat‐plate solar collectors, with a focus on the effect of the number of perforations in the plate and their diameters. Jouybari and Lundström 23 examined the effect of a porous thin film over the absorber surface on the thermal performance of a flat‐plate solar collector.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal performance of humid air flow in a rectangular solar air heater equipped with V‐shaped ribs

Kadijani

Moghadam

Ajarostaghi

et al. 2022

Energy Science & Engineering

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In this numerical work, heat transfer characteristics of humid air in a rectangular channel as solar air heater equipped with V-shaped ribs has been investigated. The impacts of geometrical parameters of proposed ribs such as height, pitch, and angle relative to air flow direction, as well as relative humidity and Reynolds number of inlet humid air on thermal performance of proposed solar air heater have been evaluated. The numerical results have been achieved using commercial Computational Fluid Dynamics (CFD) code, ANSYS FLUENT 18.2, which works based on finite volume method. Outcomes shows that, over a wide range of operating conditions, utilizing ribs cause thermal boundary layer to separate and reattach, and eventually enhance heat transfer rate. Increasing the rib angle produces stronger secondary flows, leading to higher local velocities and greater heat transfer rate. Moreover, increasing the relative humidity of inlet air from 0% to 50% leads to improve heat transfer by up to 6%. As Reynolds number increases from 4000 to 12,000, average Nusselt number rises by 7.3% and 31.4% for rib pitches of 6 and 16 mm, respectively. The results demonstrate how thermal performance of a solar air heater can be improved by utilizing V-shaped ribs.

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Experimental investigations on a cross flow solar air heater having perforated circular absorber plate for thermal performance augmentation

Cited by 43 publications

References 24 publications

Experimental Evaluation of Thermohydraulic Performance of Tubular Solar Air Heater

Experimental Evaluation of Thermohydraulic Performance of Tubular Solar Air Heater

Improving the performance of solar air heater using a new model of V‐corrugated absorber plate having perforations jets

Hydrothermal performance of humid air flow in a rectangular solar air heater equipped with V‐shaped ribs

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