Experimental investigations on jet impingement solar air collectors using pin-fin absorber

Kannan, Chellapandian; Mohanraj, M.; Sathyabalan, P.

doi:10.1177/0954408920935301

Cited by 33 publications

(8 citation statements)

References 39 publications

(46 reference statements)

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“…Dissipation rate for k is modified in a way to incorporate the transition from SST k-ω to LES. F DES is a parameter that facilitates the switching between k-ω and LES and it is defined in the following equation (8). C des and Δ are known as calibration constant and maximum local grid spacing, respectively.…”

Section: Detached Eddy Simulationmentioning

confidence: 99%

“…6,7 The study demonstrates the benefits of unsteadiness and since synthetic jets are essentially unsteady, they can be more efficient in different applications. 8 Heat transfer and flow characteristics of these jets have been investigated extensively in the literature. Studies regarding the influence of Reynolds number, shape of orifice and orifice to plate distance on the heat transfer rate of synthetic jets have also been conducted.…”

Section: Introductionmentioning

confidence: 99%

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Flow Field and Heat Transfer of an Impinging Synthetic Jet in the Presence of Cross-Flow: Application of SAS and DES Approaches

Bazdidi–Tehrani

Saadniya

Rashidzadeh

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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Nowadays, synthetic jets have various applications such as cooling enhancement and active flow control. In the present paper, the capability of two turbulence modelling approaches in predicting thermal performance of an impinging synthetic jet is investigated. These two approaches are scale adaptive simulation (SAS) and detached eddy simulation (DES). Comparisons between numerical data and experimental studies reveal that the ability of DES in predicting the asymmetrical trend of heat transfer profiles is better than SAS in almost all the study cases. Although, near the stagnation zone, the performance of SAS is superior. Results show that the effects of parameters such as frequency, cross-flow velocity and suction duty cycle factor are well predicted by both approaches. An increase of cross-flow velocity from 1.81 m/s to 2.26 m/s results in an improvement of [Formula: see text] near the stagnation point by almost 16.3% and 9.2% using DES and SAS, respectively.

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Section: Detached Eddy Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flow Field and Heat Transfer of an Impinging Synthetic Jet in the Presence of Cross-Flow: Application of SAS and DES Approaches

Bazdidi–Tehrani

Saadniya

Rashidzadeh

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…They found that the optimum transfer of heat and hydraulic performance was obtained when the baffles are located in the first part of the air channel where the baffles compose 50% of the SAH. Kannan et al (2020) offered an experimental study on the performance jet impingement SAH utilizing pin fin absorber. The influence of solar irradiation, ambient wind velocity, ambient temperature, and air mass flow rate on the jet impingement SAH without and with pin fins was considered.…”

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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“…Roy and Kundu 23 theoretically modelled recto-trapezoidal flat plate solar collector and found the outcomes are considerably better when the absorber plate thickness parameter is high for recto-trapezoidal profile. Kannan et al 24 experimentally investigated the performance of a novel jet impingement solar air collector (JISAC) using flat and pin-fin absorbers and showed that the pin-fin absorber has 2-7 C higher air temperature at the outlet with 3-7%, 2-6% and 2-6% better energy efficiency, thermo-hydraulic efficiency and exergy efficiency respectively when compared to the JISAC using flat absorber.…”

Section: Introductionmentioning

confidence: 99%

“…Kannan et al. 24 experimentally investigated the performance of a novel jet impingement solar air collector (JISAC) using flat and pin-fin absorbers and showed that the pin-fin absorber has 2–7°C higher air temperature at the outlet with 3–7%, 2–6% and 2–6% better energy efficiency, thermo-hydraulic efficiency and exergy efficiency respectively when compared to the JISAC using flat absorber.…”

Section: Introductionmentioning

confidence: 99%

Minimizing the overall loss coefficient of flat plate solar collector using energy, entropy and exergy analysis

Sathyakala

Gangadharan

Kalaiarasu

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this paper, Energy, Entropy and Exergy (EEE) analysis of flat plate solar collector is studied through a mathematical model by considering the overall loss coefficient as a non-constant parameter. The overall loss coefficient is calculated by minimizing the top loss coefficient using Lagrange multiplier optimization technique and also by empirical formulas. Further, energy efficiency, entropy generation, exergy destruction and exergy efficiency of the flat plate solar collector are also determined for the both aforesaid overall loss coefficients. The exergy efficiency of the proposed model has been doubled, when compared with the experimental measurements in the earlier literature. Also, comparing the proposed methods, it is observed that exergy efficiency obtained by using the minimal top loss coefficient is reasonably high and it enhances the overall collector’s efficiency.

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Experimental investigations on jet impingement solar air collectors using pin-fin absorber

Cited by 33 publications

References 39 publications

Flow Field and Heat Transfer of an Impinging Synthetic Jet in the Presence of Cross-Flow: Application of SAS and DES Approaches

Flow Field and Heat Transfer of an Impinging Synthetic Jet in the Presence of Cross-Flow: Application of SAS and DES Approaches

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

Minimizing the overall loss coefficient of flat plate solar collector using energy, entropy and exergy analysis

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