Heat transfer enhancement using additional gap in symmetrical element of V-geometry roughened solar air heater

Patel, Sumer Singh; Lanjewar, Atul

doi:10.1016/j.est.2021.102545

Cited by 22 publications

(4 citation statements)

References 32 publications

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“…Turbulence augmentation is generally achieved through flow modification by using corrugations, ribs and vortex generators on the absorber plate. Patel and Lanjewar 1 carried out investigations on solar air heaters which was modified with a V-geometry. This was further modified with a gap in the symmetrical element.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer augmentation of solar air heater using discrete transverse sinewave corrugations

Sankalp Shekar,

Nagaraj,

Mallashetty Shivamallaiah

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The influence of discretely placed sinewave corrugations on the effective thermal performance of the solar air heater system is presented using numerical methodology. The effect of forward and backward arrangement, normalised wavelength and amplitude on heat transfer enhancement is evaluated for different Reynolds number ranging between 6000 and 24,000. The non-dimensional wavelength and amplitude is varied as 0.0125–0.05 and 0.05–0.2 respectively while the non-dimensional pitch is taken as 1.875. The results show that the forward arrangement pattern of sinewave corrugation provides better thermo-hydraulic performance than the backward arrangement. For any given non-dimensional wavelength, lower non-dimensional amplitude exhibits greater thermal enhancement factor while for a fixed non-dimensional amplitude, the wavelength ratio of 0.025 provides greater thermal enhancement factor. The corrugation having amplitude ratio of 0.1 and wavelength ratio of 0.025 exhibits the highest thermal enhancement factor of 1.69 at Reynolds Number of 6000. It is also observed that, for Reynolds Number lesser than 9000, the configuration of amplitude ratio of 0.1 is found to exhibit higher thermal enhancement factor for any given non-dimensional wavelength. However, for Reynolds Number greater than 9000, the configuration of amplitude ratio of 0.05 is found to exhibit higher thermal enhancement factor for any given non-dimensional wavelength.

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Section: Introductionmentioning

confidence: 99%

Heat transfer augmentation of solar air heater using discrete transverse sinewave corrugations

Sankalp Shekar,

Nagaraj,

Mallashetty Shivamallaiah

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…To select the optimal configuration, the main performance parameters used were the efficiency of the solar systems, including the pumping power, and the entropy production. Patel and Lanjewar 18 conducted a study on the thermal–hydraulic performance of an air heater by analyzing the effect of artificial roughness in the form of small‐diameter wires attached transversely under the absorber. The results of the study showed that the optimum thermal–hydraulic performance is only obtained when the height of the artificial roughness is slightly higher than the thickness of the laminar‐turbulence transition layer.…”

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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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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“…As a result, the hydro thermal performance parameter in this proposed design is 3.48, and the friction factor is 0.031. SAH's thermo hydraulic performance and heat transfer were investigated using a V-geometry gap pattern with identical gap spacing and arranged in a zigzag pattern (Patel and Lanjewar 2021a). According to the experimental results, the thermal hydraulic performance value is 1.85, and when compared to SAH with smooth plate nusselt number is enhanced by 2.51 times, and friction factor is improved by 2.70 times.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Solar Air Heater Using Incline Baffles

Karthik

Gokul²

2022

JME

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To investigate the solar air heater’s (SAH) effectiveness, experiments are conducted using flat plates and artificially roughened plate in terms of Inclined and Winglet baffles over the collector surface. This proposed system collector plate comprises Inclined and Winglet ribs and serves as an artificial roughness generator. Airflow rates of 0.01, 0.02, & 0.03kg/s are used in the experiment. To determine the improvement in the proposed work, the experimental results are compared with flat plate SAH. This proposed work offers greater efficiency, useful energy gain, and lower top heat loss than a conventional SAH. The airflow rate of 0.03kg/s gives the topmost efficiency and useful energy gain. The experimental day’s average efficiency of a SAH with Incline baffles is 32.6 %, 53.6 %, and 61.9 %, respectively, for the flow rates examined. For the same flow rates, it is 37.4 %, 29.6 %, and 24.39 % more effective than a flat surface SAH. For the same investigated air flow rates, the proposed system gains 37.7 %, 27.63 %, and 23.63 % more energy than flat plate SAH. Substantial reductions in Top losses of up to 8.20 %, 6.55 %, & 7.65 % have been reported at the specified flow rates. Energy metrics and economic study performed shows the payback time, Production factor, Life cycle conversion efficiency and economic values of the proposed SAH is optimum.

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Heat transfer enhancement using additional gap in symmetrical element of V-geometry roughened solar air heater

Cited by 22 publications

References 32 publications

Heat transfer augmentation of solar air heater using discrete transverse sinewave corrugations

Heat transfer augmentation of solar air heater using discrete transverse sinewave corrugations

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

Performance Evaluation of Solar Air Heater Using Incline Baffles

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