Experimental study on the performance of spiral solar air heater

Jia, Binguang; Liu, Fang; Wang, Da

doi:10.1016/j.solener.2019.02.033

Cited by 83 publications

(13 citation statements)

References 21 publications

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“…In addition, some solutions combined solar energy storage to enhance the performance and uptime of the units after sunset, or some evacuated tube solar air collectors or concentrated forms have significantly improved efficiency compared to the traditional form [29][30][31][32]. Furthermore, some studies looking at replacing metal absorber plates with other materials were also surveyed [33][34][35]. Several studies on heat loss reduction through the wall of collector have also been considered [36,37].…”

Section: Introductionmentioning

confidence: 99%

The Effective and Exergy Efficiency of Multi-Pass Solar Air Collector with Longitudinal Fins: Analysis and Optimization

Nhut

Minh²,

Thanh³

2023

ARFMTS

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The present work investigates the exergy and effective efficiency of the multi-pass solar air collector with longitudinal fins by analysis approach and multi-objective optimization. The effect of 0.01-0.02 kg/s air flow rate, 15-35 mm collector depth, 1-3 m collector length, and 24.21-30.67 mm fin pitch was considered. The optimization was analyzed by the Preference Selection Index (PSI) method, with three maximum criteria: thermal efficiency, effective efficiency, and exergy efficiency. Mathematical models were solved by EES software. Results indicated that the multi-pass (TPLF and DPLF) type was better than the SPWF type by three criteria. The highest exergy efficiency of the TPLF and DPLF types was 6.696% and 5.636%. The greatest effective efficiency of the TPLF and DPLF types was 69.09% and 66.17%. Furthermore, the optimization results indicated that the three efficiency criteria of the DPLF type were 58.38%, 58.22%, and 4.491% for the best case; the three efficiency criteria of the TPLF type were 60.97%, 60.85%, and 5.439% for the best case. The worst configuration was the model with a short collector length, large collector depth, and large fin pitch. The collector efficiency decreased with decreased fin pitch for the configuration with the large collector length, short collector depth, and high mass flow rate.

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Section: Introductionmentioning

confidence: 99%

The Effective and Exergy Efficiency of Multi-Pass Solar Air Collector with Longitudinal Fins: Analysis and Optimization

Nhut

Minh²,

Thanh³

2023

ARFMTS

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“…Singh and Singh [ 29 , 30 ] studied the effect of various relative height and pitch ratios of V-groove corrugation and semicircular groove on the dynamic THP of curved SAHs. Jia et al [ 31 ] investigated the performance (including temperature differences between inlet and outlet, heat collection efficiency, air volume, and irradiance) of the spiral SAH for different weather conditions. The authors found that, compared to conventional and serpentine SAHs, this type of SAH has a higher heat collection efficiency.…”

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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“…SAHs are simple and flexible in design; they have low cost and require less maintenance [6]. However, the absorber surface of SAH has a very low heat transfer coefficient with air due to which its efficiency is low [7]. Many researchers proposed various surface roughness patterns and techniques to improve the performance and efficiency of SAH [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Solar Air Heater using Paraffin Wax-Aluminum Compound as Phase Changing Material

Kumar

Bhandari

Rawat³

2021

att

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This paper presents a theoretical investigation of solar air heater using phase change material (PCM). PCM used in present configuration is homogenous mixture of paraffin wax with Aluminium powder. The purpose of using Aluminium powder with paraffin wax is to increase the thermal conductivity. PCM mixtures are encapsulated in cylinders and are used as solar absorbers. Using MATLAB program, the effect of different parameters is studied. It has been observed that with increase in mass flow rate, air outlet temperature decreases and freezing time of cylinder decreases. However, at constant mass flow rate, with increase in cylinder radius, air temperature decreases and while freezing time increase sharply. The different parameters have to be chosen such that performance of solar air heater can be optimized.

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Experimental study on the performance of spiral solar air heater

Cited by 83 publications

References 21 publications

The Effective and Exergy Efficiency of Multi-Pass Solar Air Collector with Longitudinal Fins: Analysis and Optimization

The Effective and Exergy Efficiency of Multi-Pass Solar Air Collector with Longitudinal Fins: Analysis and Optimization

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

Numerical Simulation of Solar Air Heater using Paraffin Wax-Aluminum Compound as Phase Changing Material

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