Performance enhancement of a double pass solar air heater by using curved reflector: Experimental investigation

El‐Said, Emad M.S.; Gohar, M.A.; Ali, Aml; Abdelaziz, Gamal B.

doi:10.1016/j.applthermaleng.2021.117867

Cited by 31 publications

(2 citation statements)

References 61 publications

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“…The utilization of w-type roughened SAH developed [ 40 , 41 ] accompanied by similar distance on the channels for improvement of Nu number with an additional effect of booster mirrors. Similarly, a number of works have been reported in the most recent years to show the extensive improvements in exergy, CFD, and THP of solar air collectors by using different methodologies [ 42 , 43 , 44 , 45 , 46 , 47 , 48 ].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Three Side Roughened Solar Air Heater: A Preliminary Investigation

Behura

Mohanty

Singh³

et al. 2022

Materials

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In recent years, sunlight has been used in several fields such as photovoltaic cells, flat plate collectors, solar cookers, green buildings, and agricultural applications. Improved thermal performance has been seen which comes of three sides absorber plate with glass cover compared to the traditional one. This paper presents the Nusselt (Nu) number, collector efficiency factor (CEF), and collector heat removal factor (CHRF) for the optimal solution of three sides artificially roughened solar air heater. Five input variables such as Reynolds (Re) number, relative roughness pitch, relative roughness height, mass flow rate, and air temperature of the duct are taken into account for improved efficiency optimization of collector, collector heat removal factor, and Nu number. Technique for order of preference by similarity to ideal solution (TOPSIS) technique is used to identify the best alternative amongst a number of performance measures by converting them into an equivalent single variable. Moreover, the results revealed the high accuracy of the CEF, CHRF, and Nu number of 75–80%, 74–78%, and 63–71%, respectively. Meanwhile, it has been also observed that roughness Re number varies between 12,500 and 13,500, and height of relative roughness is 0.0245, including pitch of relative roughness 10 along with the rate of mass flow is 0.041 kg/s.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of Three Side Roughened Solar Air Heater: A Preliminary Investigation

Behura

Mohanty

Singh³

et al. 2022

Materials

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“…An external reflector coupled with double pass SAH having corrugated absorber plate improves its thermo-hydraulic performance. The maximum value of enhanced average thermal and thermo-hydraulic efficiencies was 19.33% and 19.84% respectively [31]. Agrawal et al [32] analyzed solar PV integrating with reflector and found that performance was improved.…”

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confidence: 99%

Experimental determination for optimal position of reflector in solar water heater

Gaurav,

Verma

2024

Eng. Res. Express

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An experimental investigation was carried out on novel solar water heater that utilizes a flat reflector positioned underneath the absorber tubes. Experiments were conducted at National Institute of Technology Patna, India, having latitude 25.61°N and longitude 85.14°E and constant insolation of 1000 W⁄m^2 . The experimental data were collected for different reflector positions i.e. δ = 0 mm, 15 mm, 30 mm, 45 mm, and 60 mm and six mass flow rates of working fluid i.e. 0.0056 kg/s, 0.0097 kg/s, 0.0138 kg/s, 0.0207 kg/s, 0.0277 kg/s, and 0.0346 kg/s. The obtained experimental results exhibited that the location of the reflector relative to the absorber tubes significantly affects the thermal performance of the system. The effect of the mass flow rate on the outlet temperature, thermal performance, and overall performance has also been studied. For the present system under energy and exergy analysis, the optimal position of the reflector was found of δ = 30 mm. The results showed that the solar water heater with an optimally positioned reflector has a 23% increase in thermal efficiency compared to the solar water heater without a reflector. The novelty of using a flat reflector underneath absorber tube is to provide heat to rear side of the absorber tubes after reflecting the insolation falling on the reflector and hence improvement in the thermal performance of the solar water heater. The scope of present system includes providing an eco-friendly and energy-efficient solution for residential and commercial hot water needs. Limitations of the present study are requirement of sufficient roof space and direct sunlight. The use of reflectors has implications for energy savings, more efficient system designs, and enhanced thermal performance.

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Environmental, economic, and performance assessment of solar air heater with inclined and winglet baffle

Rajendran¹,

Singaraj²,

Rajarathinam³

2022

Environ Sci Pollut Res

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Performance enhancement of a double pass solar air heater by using curved reflector: Experimental investigation

Cited by 31 publications

References 61 publications

Performance Analysis of Three Side Roughened Solar Air Heater: A Preliminary Investigation

Performance Analysis of Three Side Roughened Solar Air Heater: A Preliminary Investigation

Experimental determination for optimal position of reflector in solar water heater

Environmental, economic, and performance assessment of solar air heater with inclined and winglet baffle

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