Performance enhancement of solar air heater using herringbone corrugated fins

Kumar, Ramesh; Chand, Prabha

doi:10.1016/j.energy.2017.03.128

Cited by 96 publications

(37 citation statements)

References 25 publications

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“…The thermal efficiency of wavy fin solar air heater is greater than offset finned solar air heater of Youcef -Ali and Desmons [22] by 10.36% and finned solar air heater of Karim and Hawlader [23] by 29.63% for the investigated range of system and operating parameters. Also, the thermal efficiency values of Karim and Hawlader [15] for plane solar air heater show a deviation ±3.48% from the plane solar air heater of present result. This holds a good agreement between the experimental values and makes the perfection of data collected through experimentation.…”

Section: Resultscontrasting

confidence: 63%

“…Hence, researchers have focused their attention to employ these fins in the air heater, which enhances the overall heat conductance. Kumar and Chand [15] developed a mathematical model for herringbone corrugated fins to predict the effect of system, operating and meteorological parameters on the thermal and thermohydraulic performance of solar air heater. They found an improvement of 20.4% in thermal efficiency with the penalty of increased pressure drop at fin spacing 2.5 cm and mass flow rate of 0.026 kg/s.…”

Section: Introductionmentioning

confidence: 99%

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Thermal performance of wavy finned absorber solar air heater

Priyam¹,

Chand²

2018

IJHT

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This paper presents an experimental investigation on the thermal performance enhancement of solar air heater having wavy fins attached below the absorber plate. Tests were conducted to cover a wide range of parameters such as mass, velocity, fin spacing and insolation under actual outdoor conditions. The effect of these parameters on the thermal performance has been examined and the results have been compared with plane solar air heater. The maximum enhancement in thermal efficiency for wavy finned absorber solar air heater for fin spacing of 2 cm has been found to be 28.71% as compared to fin spacing of 6 cm and 116.67% as compared to plane solar air heater. The maximum value of ∆T/I for wavy fin spacing 2 cm, 6 cm and plane solar air heater has been achieved as 0.067, 0.048 and 0.029 m 2-°C/W respectively. Wavy finned absorber solar air heater has been found to be 67.44 to 121.43% thermally efficient as compared to plane solar air heater within the investigated range of system i.e. fin spacing of 2 to 6 cm and operating parameters i.e. mass velocity of 0.0065-0.033 kg/sm 2. A substantial enhancement in thermal efficiency was achieved in comparison to plane solar air heater and this improvement is a strong function of system and operating parameters.

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Section: Resultscontrasting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Thermal performance of wavy finned absorber solar air heater

Priyam¹,

Chand²

2018

IJHT

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“…5. For twist ratio Y=2, increase in insolation from 400 W/m 2 to 1000 W/m 2 enhances the exergy efficiency from 1.8 % to 3.8 %.…”

Section: The Thermal and Exergy Efficiency Have Conflictingmentioning

confidence: 99%

“…Various passive elements e.g. extended surfaces [2,3], corrugated absorber [4], artificial roughness [5,6], packed bed [7], wire coils [8,9], twisted tape [10] etc. have been utilized to ameliorate the performance of a solar air heater.…”

Section: Introductionmentioning

confidence: 99%

Analytical Investigation on Solar Air Heater with Fins and Twisted Tapes

Kumar¹,

Chand²

2019

IJHT

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The present work proposes an analytical investigation on the energetic and exergetic performance of an air heating solar collector having absorber surface equipped with fins and twisted tapes of twist ratio Y=2,4,6 and 8. A mathematical model capable of predicting the energy and exergy efficiency has been developed. The effects of mass flow rate, twist ratio and insolation on the thermal and exergy efficiency have been studied. Further, a comparison has been made with the results of smooth absorber solar air heater to check the performance enhancement over it. The results indicated that the thermal efficiency increases monotonically with increase in air flow rate but the exergy efficiency curve first goes up, achieves its maxima and then declines. Decrease in twist ratio from Y=8 to 2 leads to improvement in the thermal efficiency for whole range of studied mass flow rate but enhancement in the exergy efficiency was observed only up to the mass flow rate of 0.022 kg/s thereafter it starts decreasing.

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“…Turbulence promoters like ribs, grooves, and various absorber shapes can be introduced to increase the turbulence and thereby enhance the convective heat transfer coefficient due to an increase in the Nusselt number. Incorporation of extended surfaces on the absorber can also enhance the heat transfer due to greater absorber surface area [68].…”

Section: Active Photovoltaicmentioning

confidence: 99%

Technological Advances to Maximize Solar Collector Energy Output: A Review

Salvi

Bhalla

Taylor

et al. 2018

Journal of Electronic Packaging

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Since it is highly correlated with quality of life, the demand for energy continues to increase as the global population grows and modernizes. Although there has been significant impetus to move away from reliance on fossil fuels for decades (e.g., localized pollution and climate change), solar energy has only recently taken on a non-negligible role in the global production of energy. The photovoltaics (PV) industry has many of the same electronics packaging challenges as the semiconductor industry, because in both cases, high temperatures lead to lowering of the system performance. Also, there are several technologies, which can harvest solar energy solely as heat. Advances in these technologies (e.g., solar selective coatings, design optimizations, and improvement in materials) have also kept the solar thermal market growing in recent years (albeit not nearly as rapidly as PV). This paper presents a review on how heat is managed in solar thermal and PV systems, with a focus on the recent developments for technologies, which can harvest heat to meet global energy demands. It also briefs about possible ways to resolve the challenges or difficulties existing in solar collectors like solar selectivity, thermal stability, etc. As a key enabling technology for reducing radiation heat losses in these devices, the focus of this paper is to discuss the ongoing advances in solar selective coatings and working fluids, which could potentially be used in tandem to filter out or recover the heat that is wasted from PVs. Among the reviewed solar selective coatings, recent advances in selective coating categories like dielectric-metal-dielectric (DMD), multilayered, and cermet-based coatings are considered. In addition, the effects of characteristic changes in glazing, absorber geometry, and solar tracking systems on the performance of solar collectors are also reviewed. A discussion of how these fundamental technological advances could be incorporated with PVs is included as well.

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Performance enhancement of solar air heater using herringbone corrugated fins

Cited by 96 publications

References 25 publications

Thermal performance of wavy finned absorber solar air heater

Thermal performance of wavy finned absorber solar air heater

Analytical Investigation on Solar Air Heater with Fins and Twisted Tapes

Technological Advances to Maximize Solar Collector Energy Output: A Review

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