Critical review of ribbed solar air heater and performance evaluation of various V-rib configuration

Nidhul, Kottayat; Yadav, Ajay Kumar; Anish, S.; Kumar, Sachin

doi:10.1016/j.rser.2021.110871

Cited by 37 publications

(4 citation statements)

References 95 publications

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“…4 However, there are disadvantages associated with this technology, the most important being the low heat transfer efficiency of the air. 5,6 Indeed, the poor thermal characteristics of the air make it necessary to increase the speed and turbulence of the air stream, as well as to extend the heat exchange surface to obtain a high exchange coefficient. Therefore, a variety of design, materials and flow configurations have been proposed in several studies to improve the thermal performance of these collectors.…”

Section: Introductionmentioning

confidence: 99%

“…This is because they avoid several common problems, such as corrosion, boiling, freezing, and leaks 4 . However, there are disadvantages associated with this technology, the most important being the low heat transfer efficiency of the air 5,6 . Indeed, the poor thermal characteristics of the air make it necessary to increase the speed and turbulence of the air stream, as well as to extend the heat exchange surface to obtain a high exchange coefficient.…”

Section: Introductionmentioning

confidence: 99%

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Energetic performance evaluation of a corrugated channel solar air heater: Experimental investigation, mathematical modeling, and solution procedure

Chanaa,

Benhmida,

Nadi

et al. 2023

Heat Trans

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The cost of manufacturing and electricity consumption are key considerations in encouraging the adoption of solar air heaters (SAH) in sunny and low‐income areas. These parameters can have a significant impact on promoting the use of these devices. In this study, solar air heating was designed with the objective of achieving the highest possible efficiency/cost ratio. It is a corrugated channel SAH whose structure is equipped with two barriers perforated with a sufficient number of holes for a good airflow distribution. A new model was developed to evaluate the qualitative parameters that describe the thermos‐energetic behavior of a heating system. These parameters were measured using experimental data obtained under real operating conditions. The thermal model assumes a uniform temperature for the glass, absorber, and insulation of the collector, while the temperature of the circulating air is assumed to vary linearly along the collector. To ensure that these assumptions were valid, the collector was cut into a number of 0.1 m sections in the direction of flow. By comparing the numerical results with the experimental data, the model was validated and then used to calculate the temperature profiles of the different elements of the collector, as well as to estimate the impact of certain operational parameters on its thermal performance. Relative percentage error values, between the numerical and the experimental results, of 1.7517%, 1.0750%, 0.8577%, 2.2371%, and 2.3637% for absorber plate temperature, outlet airflow temperature, useful power, thermal, and effective efficiencies, respectively, are recorded.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energetic performance evaluation of a corrugated channel solar air heater: Experimental investigation, mathematical modeling, and solution procedure

Chanaa,

Benhmida,

Nadi

et al. 2023

Heat Trans

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show abstract

“…A heat transfer enhancement device generally increases the thermal performance of the PVTC in two ways: extending the heat transfer surface or improving the heat transfer coefficient. An increase in the heat transfer coefficient can be achieved by installing turbulators, such as ribs, baffles, and protrusions, at the heated wall, which breaks the viscous sublayer and generates additional turbulence near the wall [22,23]. A further advantage of attaching the turbulators is that this method has a lower pressure drop than that caused by extending the heat transfer surface [24].…”

Section: Introductionmentioning

confidence: 99%

Electrical and Thermal Performances of a Single-Pass Double-Flow Photovoltaic-Thermal Collector Coupled with Nonuniform Cross-Section Rib

Choi

2023

International Journal of Energy Research

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The air-based photovoltaic-thermal collector (PVTC) is a system that can generate electricity and heated air simultaneously from solar energy. This study investigates the electrical and thermal performances of an air-based single-pass double-flow photovoltaic-thermal collector (SPDFPVTC) coupled with a nonuniform cross-section rib (NUCSR) under various operating conditions. The rib is installed at the rear of the photovoltaic panel to enhance the heat transfer performance between the photovoltaic panel and the flowing air. Based on the energy balance equations, a mathematical model of the proposed SPDFPVTC is established and validated by experimental results. The solar intensity, air mass flow rate, and wind speed are selected as operating conditions. The effects of these operating conditions on the electrical and thermal performance of the SPDFPVTC have been discussed. In addition, this study evaluates the daily performance of SPDFPVTC with and without NUCSR. The average electrical, thermal, and overall efficiency were 17.59%, 43.96%, and 61.55%, respectively, for SPDFPVTC with NUCSR and 16.97%, 38.87%, and 55.83%, respectively, for SPDFPVTC without NUCSR. Consequently, installing NUCSR could enhance the daily electrical, thermal, and overall energy output of SPDFPVTC by 4.33%, 13.23%, and 10.63%, respectively.

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“…A SAH is relatively cheap to buy and maintain, but it has a low thermal efficiency because of the low thermo-physical characteristics of the air in the laminar sub-layer region over the heated absorber plate [5]. Artificial roughness of various patterns on the absorber plate can be used to alleviate the sub-layer disadvantage and improve system effectiveness [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Roughened Solar Air Heaters for Stretched Parameters

et al. 2022

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Artificial roughness applied to a Solar Air Heater (SAH) absorber plate is a popular technique for increasing its total thermal efficiency (ηt−th). In this paper, the influence of geometrical parameters of V-down ribs attached below the corrugated absorbing plate of a SAH on the ηt−th was examined. The impacts of key roughness parameters, including relative pitch p/e (6–12), relative height e/D (0.019–0.043), angles of attack α (30–75°), and Re (1000–20,000), were examined under real weather conditions. The SAH ηt−th roughened by V-down ribs was predicted using an in-house developed conjugate heat-transfer numerical model. The maximum SAH ηt−th was shown to be 78.8% as predicted under the steady-state conditions of Re = 20,000, solar irradiance G = 1000 W/m2, p/e = 8, e/D = 0.043, and α = 60. The result was 15.7% greater efficiency compared to the default smooth surface. Under real weather conditions, the ηt−th of the roughened SAH with single- and double-glass covers were 17.7 and 20.1%, respectively, which were higher than those of the smooth SAH.

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Critical review of ribbed solar air heater and performance evaluation of various V-rib configuration

Cited by 37 publications

References 95 publications

Energetic performance evaluation of a corrugated channel solar air heater: Experimental investigation, mathematical modeling, and solution procedure

Energetic performance evaluation of a corrugated channel solar air heater: Experimental investigation, mathematical modeling, and solution procedure

Electrical and Thermal Performances of a Single-Pass Double-Flow Photovoltaic-Thermal Collector Coupled with Nonuniform Cross-Section Rib

Performance Evaluation of Roughened Solar Air Heaters for Stretched Parameters

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