Experimental Investigation of Double Pass Solar Air Collector for Using in Agricultural Applications

2020 ◽  
pp. 98-117
Author(s):  
Mohammed Fahmi ◽  
Wissam Khalil ◽  
Amer Shareef
Keyword(s):  
Thermal Performance ◽  
Winter Season ◽  
Longitudinal Direction ◽  
Absorber Plate ◽  
Double Pass ◽  
Solar Air Collector ◽  
Agricultural Applications ◽  
Good Technique ◽  
Extended Surfaces ◽  
Good Agreement

In this research, an experimental study has been performed in order to enhance the thermal performance of a double-pass solar air collector by employing extended surfaces. In order to increase the heat transfer area, triangular-shaped fins were mounted on the longitudinal direction of the absorber plate. Four models of the solar air collectors were made of aluminum with different fin configurations. The experiments were carried out at the winter season in the climate of Iraq - Ramadi city with longitude 43.268 and latitude (33.43). The used range of mass flow rate in the experiments was from 0.027 kg/s to 0.037 kg/s. The comparison with previous studies in terms of thermal efficiency showed good agreement where the percentage of error does not exceed 1% between them. The results also provided that the existing of fins was a good technique for enhancing the thermal performance of double-pass solar air collector with a marginal increase in pressure drop. Consequently, it is possible to adopt this kind of solar air collectors for many agricultural applications such as solar dryer.

Performance and Economic Analysis of Double Pass Solar Air Collector

2011 ◽  
Author(s):  
Akhilesh Gupta ◽  
Ravi Kumar ◽  
Bharat Ramani
Keyword(s):  
Porous Material ◽  
Economic Analysis ◽  
Thermal Performance ◽  
Convective Heat Transfer Coefficient ◽  
Radiation Energy ◽  
High Heat ◽  
Absorber Plate ◽  
Double Pass ◽  
Plate Temperature ◽  
Solar Air Collector

Solar collector is a type of heat exchanger which transfers solar radiation energy into the heat energy. Conventional solar air collectors have poor thermal efficiency primarily due to high heat losses and low convective heat transfer coefficient between the absorber plate and flowing air stream, leading to higher absorber plate temperature and greater thermal losses. Attempts have been made to improve the thermal performance of conventional solar air collectors by employing various design and flow arrangements. Double pass counter flow solar air collector with porous material in the second air passage is one of the important and effective design improvement that has been proposed to improve the thermal performance. This paper presents the performance and economic analysis of double pass solar air collector with and without porous material. Effects of various parameters on the thermal performance and pressure drop characteristics have been studied experimentally. The study concludes that double pass arrangement with porous material is economical and having short payback period. Also, the thermal performance of double pass solar air collector with porous material is significantly higher compared to double pass solar air collector without porous material and single pass arrangement.

Thermal Performance Analysis of a Rectangular Longitudinal Finned Solar Air Heater With Semicircular Absorber Plate

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Satyender Singh ◽  
Prashant Dhiman
Keyword(s):  
Thermal Performance ◽  
Numerical Solutions ◽  
Solar Air Heater ◽  
Duct Flow ◽  
Balance Equations ◽  
Absorber Plate ◽  
Ansys Fluent ◽  
Air Heater ◽  
Glass Cover ◽  
Good Agreement

Thermal performance of a single-pass single-glass cover solar air heater consisting of semicircular absorber plate finned with rectangular longitudinal fins is investigated. The analysis is carried out for different hydraulic diameters, which were obtained by varying the diameter of the duct from 0.3–0.5 m. One to five numbers of fins are considered. Reynolds number ranges from 1600–4300. Analytical solutions for energy balance equations of different elements and duct flow of the solar air heater are presented; results are compared with finite-volume methodology based numerical solutions obtained from ansys fluent commercial software, and a fairly good agreement is achieved. Moreover, analysis is extended to check the effect of double-glass cover and the recycle of the exiting air. Results revealed that the use of double-glass cover and recycle operation improves the thermal performance of solar air heater.

scholarly journals Optimizing Thermal Efficiencies of Double-Pass Cross-Corrugated Solar Air Heaters on Various Configurations with External Recycling

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4019
Author(s):  
Chii-Dong Ho ◽  
Hsuan Chang ◽  
Ching-Fang Hsiao ◽  
Yu-Chen Lin
Keyword(s):  
Heat Transfer ◽  
Thermal Performance ◽  
Operating Conditions ◽  
Transfer Efficiency ◽  
Bottom Plate ◽  
Device Performance ◽  
Absorber Plate ◽  
Double Pass ◽  
Operational Conditions ◽  
Heat Transfer Efficiency

The effect of external-recycle operations on the thermal performance of double-pass cross-corrugated solar air heaters (SAH) under different operating conditions was investigated experimentally and theoretically. Additionally, the simultaneous ordinary equations were solved analytically for each proposed configuration. Four recycling types are introduced for improving the solar thermal performance with different external recycle processes, which are expected to enhance the heat transfer coefficient with a convective turbulent flow between the air and the absorber in the present study. Using recycling double-pass operations, two processes were conducted sequentially: air first flowed over the sinusoidal corrugated absorber plate and then flowed back later over the transverse sinusoidal corrugated bottom plate. Improved device performance was achieved due to the doubled heat transfer area over and under the corrugated absorber plate, from which both the sinusoidal cross-corrugated absorber plate and bottom plate enhanced turbulent intensity. Theoretical predictions and experimental results both indicated that the recycle ratio increased with the SAH thermal efficiency for all proposed designs. The results show a higher heat transfer efficiency for the proposed four configurations using wavelike corrugated plates compared to those conducted in single-pass and flat-plate absorber plates with up to a maximum 133% (from 0.301 to 0.703) increment. The optimal device performance was examined for all external-recycle configurations under the same working dimensions and operational conditions. The best configuration for optimal thermal performance was the device that lengthened the air flow pathway and increased the air velocity within the collector; thus, a higher heat transfer rate was accomplished. The evaluation of increments in the power consumption and of the heat-transfer efficiency enhancement together determined the optimal design based on an economic consideration across various configurations of cross-corrugated double-pass devices.

scholarly journals Numerical study on thermal performance of a solar air collector with fins and baffles attached over the absorber plate

2017 ◽  
Vol 35 (2) ◽  
pp. 289-296
Author(s):  
Faris Aissaoui ◽  
Abdelmoumene Benmachiche ◽  
Abdelhafid Brima ◽  
Yousef Belloufi ◽  
Moussa Belkhiri
Keyword(s):  
Thermal Performance ◽  
Numerical Study ◽  
Absorber Plate ◽  
Solar Air Collector

Experimental Investigation Of Double Pass Solar Air Collector For Using In Agricultural Applications

2020 ◽  
pp. 98
Author(s):  
محمد صالح فهمى ◽  
وسام هاشم خليل ◽  
عامر جميل شريف
Keyword(s):  
Experimental Investigation ◽  
Double Pass ◽  
Solar Air Collector ◽  
Agricultural Applications
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