Fully developed periodic and thermal performance evaluation of a solar air heater channel with wavy-triangular ribs placed on an absorber plate

Promthaisong, Pitak; Eiamsa-ard, Smith

doi:10.1016/j.ijthermalsci.2019.03.010

Cited by 38 publications

(9 citation statements)

References 24 publications

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“…th PV k PV (11) The thermal resistances for between the triangular baffles and insulation layer, R 6-7 are given by Equation (12).…”

Section: Energy Balance Equationsmentioning

confidence: 99%

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Effect of Triangular Baffle Arrangement on Heat Transfer Enhancement of Air-Type PVT Collector

Kim

2020

Sustainability

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A Photovoltaic Thermal (PVT) Collector is a device that produces electricity and simultaneously uses a heat source transmitted to back side of the Photovoltaic (PV). The PVT collector is categorized into liquid-type and air-type according to the heating medium. As an advantage, air-type PVT system is easy to manage and can be directly used for heating purposes. The performance of air-type PVT collector is determined by various factors, such as the height of air gap and air flow path (by baffles) in the collector. Baffles are installed in the PVT collector to improve the thermal performance of the collector by generating turbulence. However, the air flow that affects the performance of the PVT collector can vary depending on the number and placement of the baffles. Thus, the flow design using baffles in the collector is important. In this study, the performance of an air-type PVT collector due to the arrangement of triangular baffles and air gap height at the back of the PV module is analyzed through a simulation program. For this purpose, Computational Fluid Dynamics (CFD) analysis was performed with an NX program to compare and analyze the optimum conditions to improve the performance of the collector.

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“…th PV k PV (11) The thermal resistances for between the triangular baffles and insulation layer, R 6-7 are given by Equation (12).…”

Section: Energy Balance Equationsmentioning

confidence: 99%

“…In the studies by Promthaisong et al [12], triangular ribs were applied to the thermal absorber plate and analyzed in the Reynolds number range of 3000-20,000. The influence of blockage ratio and the pitch ratio of the rib were analyzed as variables.…”

Section: Introductionmentioning

confidence: 99%

Effect of Triangular Baffle Arrangement on Heat Transfer Enhancement of Air-Type PVT Collector

Kim

2020

Sustainability

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“…Due to the lower conversion efficiency into heat, the surface area required for the solar collectors will be huge. To increase efficiency, some special arrangements like turbulators have been used by various researchers in the flow passage (Gawande, Dhoble, Zodpe, & Chamoli, 2016;Gilani, Al-Kayiem, Woldemicheal, & Gilani, 2017;Promthaisong & Eiamsa-Ard, 2019;Saini & Verma, 2008). But it is observed that the increase in the efficiency by using these turbulators is found to be very characteristics (Lin & Wang, 2009;Sarada, Raju, Radha, & Sunder, 2010).…”

Section: Introductionmentioning

confidence: 99%

Study on Heat Transfer Augmentation in an Air Heater Using Rectangular Wavy Fin Turbulators

Kumar¹,

Kumar²

2022

Front. Heat Mass Transf.

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In the present study, the use of wavy fin turbulators on the annulus body of a double pipe air heater has been numerically investigated. The inner pipe consists of hot water whereas the annular section consists of cold air whose Reynolds Number (Re) ranged from 3000-15,000. Rectangular crosssectioned wavy fin turbulators with various curvature ratios of 2, 3, 5, and 7.5 is numerically simulated to investigate the influence of curvature effects on turbulence. Results have been compared with the bare pipe and with rectangular straight fins. It is seen that wavy fin turbulators perform better (compared to (other two) bare and rectangular straight fin) than both of them by creating turbulence effects in the flow field. Nusselt number (Nu) is increased by 256% and 51% as compared to bare and rectangular straight fin type. Parametric studies revealed that as the curvature ratio (CR) is reduced, the turbulent intensity and turbulent kinetic energy increase with better heat transfer characteristics. The highest Thermo hydraulic performance index of 4.8 is noticed for the CR of 2 at a Re of 6000 and is 34% higher than the straight rectangular fin.

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“…The results displayed that the average daily thermal efficiency increases by about 9%, 12%, and 13% in cases of pin finned, corrugated fins, and corrugated-perforated fin absorbers, respectively. The performance of SAH with wavy triangular ribs installed on its absorber plate was investigated theoretically using turbulent model by Promthaisong and Eiamsa-ard (2019). The study was carried out at Reynolds number in the range of 3000 to 20,000.…”

Section: Introductionmentioning

confidence: 99%

Energy and exergy assessment of new designed solar air heater of V-shaped transverse finned absorber at single- and double-pass flow conditions

Abo-Elfadl

El-Dosoky

Hassan

2021

Environ Sci Pollut Res

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Flat plate solar collector is one of the main solar collectors that has a simple structure, reliable operation, large heat preoccupation area, and low cost. Its drawback is the low heat transfer between the working air and the absorber plate. A solar air heater of Vshaped transverse finned absorber having new designed absorber plate of lateral gaps and central holes to enhance its performance is investigated experimentally at single-pass and double-pass airflow conditions. Moreover, the energy and exergy assessment of its performance was studied and compared with traditional longitudinal finned heater having the same fin surface area and construction except for the absorber plate design. The study is investigated at air mass flow rates of 0.025, 0.05, and 0.075 kg/s. Findings show that the new heater achieves maximum outlet temperature rising of 28.2 °C at 0.025 kg/s and doublepass flow. Moreover, it has an average daily energy efficiency of 88.5%, 81.88%, and 61.3% at mass flow rates of 0.075, 0.05, and 0.025 kg/s with increments of 9.4%, 13.3%, and 9.66%, respectively, compared to the longitudinal finned heater. Additionally, it achieves exergy efficiencies of 2.5%, 2.1%, and 1.7% at mass flow rates of 0.025, 0.05, and 0.075 kg/s with increments 18%, 25.7%, and 18.2%, respectively, relative to longitudinal finned heater. Furthermore, the new heater design possesses greater energy efficiency comparing to former studied SAH designs.

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Fully developed periodic and thermal performance evaluation of a solar air heater channel with wavy-triangular ribs placed on an absorber plate

Cited by 38 publications

References 24 publications

Effect of Triangular Baffle Arrangement on Heat Transfer Enhancement of Air-Type PVT Collector

Effect of Triangular Baffle Arrangement on Heat Transfer Enhancement of Air-Type PVT Collector

Study on Heat Transfer Augmentation in an Air Heater Using Rectangular Wavy Fin Turbulators

Energy and exergy assessment of new designed solar air heater of V-shaped transverse finned absorber at single- and double-pass flow conditions

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