An analytical investigations on thermal and thermohydraulic performance of offset finned absorber solar air heater

Rai, Shalini; Chand, Prabha; Sharma, Sandeep

doi:10.1016/j.solener.2017.05.039

Cited by 31 publications

(13 citation statements)

References 15 publications

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“…Different shapes of fins have been studied. First, longitudinal fins which was studied by many researchers either experimentally [6][7][8] or theoretically [9,10]. The results of such studies confirmed that attaching fins to the absorber plate improves the performance of SAH as they have higher heat transfer area and lower irreversibility compared to flat plate SAH.…”

Section: Introductionmentioning

confidence: 85%

“…The results of such studies confirmed that attaching fins to the absorber plate improves the performance of SAH as they have higher heat transfer area and lower irreversibility compared to flat plate SAH. Decreasing fins spacing and increasing fins height enhances the thermal and thermohydraulic efficiencies by 114.1 and 112.65 %, respectively as concluded in [9]. Also, recycling process with various reflux ratios was studied to obtain the ratio which achieves the best performance of finned SAHs [11][12][13].…”

Section: Introductionmentioning

confidence: 87%

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Influence of bladed and glazed entrance on the performance of solar air heaters

et al. 2018

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The performance of a flat plate single-pass Solar Air Heater (SAH) modified at the entrance region was experimentally investigated. This entrance region was covered with glass cover instead of steel. Using glass at the entrance region increases the heating area exposed to solar radiation and avoids the restriction of solar radiation from reaching this area as in case of steel cover. Also, guide blades were placed in the entrance region to ensure well air distribution on the absorber surface and hence enhancing the thermal performance of SAH. The modified SAH was compared with another of conventional entrance. The experiments were performed at four air flow rates ranged from 0.013 to 0.04 kg/s. The modifications led to good enhancement in both the air temperature difference and the efficiency. For the daily efficiency, the maximum values are 43.43, 40.48 and 32.92 % for the glazed-bladed entrance SAH, glazed entrance SAH and conventional SAH, respectively, at the rate of 0.04 kg/s. The glazed-bladed SAH showed a good improvement in the daily thermal efficiency by 6.72 to 10.5 % over the conventional heater and by 2.16 to 3.25 % over the glazed SAH.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 87%

Influence of bladed and glazed entrance on the performance of solar air heaters

et al. 2018

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“…The experimental results revealed that the immediate and daily efficiencies of the FPSAH with and without utilizing the PCM increases when the mass flow rate increases. Rai et al (2017) examined the impact of variation of system and operating parameters such as fin spacing, fin height, air mass flow rate and insolation on the thermal and thermohydraulic (effective) efficiencies. Outcomes suggested that the thermal efficiency increases continuously with boost in mass flow rate, whereas thermohydraulic efficiency increases approximately a beginning value of air mass flow rate which obtains a maximum and after that decreases sharply for a provided fin spacing and fin height.…”

Section: Heat Transfer Characteristics With Andmentioning

confidence: 99%

A Comprehensive Review of Performance Analysis of With and Without Fins Solar Thermal Collector

Kumar¹,

Kumar²,

Thakur³

et al. 2021

Frontiers in Heat and Mass Transfer

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Solar thermal collector is a simple, economic, and environment friendly equipment which is used to utilize solar energy for various agriculture and industrial applications. The investigators mainly focus on the improvement of the thermal performance by providing various fins shapes underside of the absorber plate in the single pass and double pass solar thermal collector. This work discusses the influence of different shaped fins used by various researchers in improving the thermal performance of thermal collectors. Fin's design, geometries used, and their influence on turbulence and thermal performance have also been discussed. As per the literature review and comparative study the heat transfer rate is greater for solar air thermal collector with fins as compared to solar air thermal collector without fins.

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“…The solar radiation incident on solar collector has little effect on the efficiency of the collector, although it has a significant impact on the ambient air temperature around the collector. The outlet air temperature in flow channel increases almost linearly with insolation [6].…”

Section: Introductionmentioning

confidence: 96%

Flat plate solar air heater with helical integrated fins for drying processe

Farkas

Al-Neama

2018

Proceedings of 21th International Drying Symposium

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In this study, an experimental investigation was carried out on solar system consists of many main components; solar air collector, drying chamber and air blower. Manufacturing and an analysis of two active double-pass solar air collector integrated with unfinned and helical finned absorbers have been carried out. The helical fins increased the standers solar collector (unfinned) efficiency by about 6%. In five hours for 2 kg of apple slices drying, the final weight of the dried product is 1.237 kg using an unfinned solar collector, while 1.039 kg using helical finned solar collector. Keywords: solar drying, air heater, thermal performance, helical fins.

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An analytical investigations on thermal and thermohydraulic performance of offset finned absorber solar air heater

Cited by 31 publications

References 15 publications

Influence of bladed and glazed entrance on the performance of solar air heaters

Influence of bladed and glazed entrance on the performance of solar air heaters

A Comprehensive Review of Performance Analysis of With and Without Fins Solar Thermal Collector

Flat plate solar air heater with helical integrated fins for drying processe

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