Impact of perforated shapes in delta type hindrance promoter on thermo-hydraulic performance of solar water heating system (An experimental study)

Khargotra, Rohit; Kumar, Raj; Kumar, Sushil

doi:10.1016/j.csite.2020.100831

Cited by 29 publications

(4 citation statements)

References 20 publications

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“…whereas passive techniques use geometric modification in heat exchanger tube. 20,21,22 Heat transfer augmentation in PTC using air as working fluid has been carried out by several researchers. 14,15,16,17,18 Zhao et al 14 have experimented the PTC with pin finned receiver tube with air as a working fluid for industrial process heat application.…”

Section: Heat Transfer Augmentation In Ptcmentioning

confidence: 99%

Performance evaluation of solar parabolic trough receiver using multiple twisted tapes with circular perforation and delta winglet

Thapa

Samir

Kumar³

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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A parabolic trough collector (PTC) is one of the concentrating types of a solar collector working in the medium range of temperature from 100–400 °C, for this reason, the efficiency of the solar parabolic trough is less than other types of concentrating solar collector (Point focusing types) in terms of solar to thermal energy conversion, the improvement in efficiency is achieved by various passive heat augmentation techniques in the receiver tube. One of the promising passive techniques is twisted tape inserts used in the receiver due to its simplicity in design and the various possibility of geometric modification. This paper deals with the performance evaluation of the solar parabolic trough receiver system by using passive techniques in the receiver. The testing of the receiver of PTC was done by using multiple perforated twisted tapes with winglets having different perforation ratios ([Formula: see text]) of 0.05, 0.15, 0.25, twist ratios ([Formula: see text]) of 3, 4, 5 and wing depth ratios ([Formula: see text]) of 0.1, 0.2 and 0.3. The number of twisted tapes was fixed at 4. The examination was conducted for Reynolds numbers ([Formula: see text]) varying from 3000–21,000 using air as working fluid. The outcome shows that the use of perforation and winglet in twisted tapes augment the Nusselt number as compared to that of smooth twisted tapes. The maximum thermohydraulic performance ([Formula: see text]) of 2.40 is received by using multiple twisted tapes with perforation and winglet having [Formula: see text] = 0.3, [Formula: see text] = 3, and [Formula: see text] = 0.05 at the Re = 21,000. The correlations for Nusselt number ([Formula: see text]) and friction factor ([Formula: see text]) are also developed with ± 8.5% and ± 8.3% accuracy, respectively.

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Section: Heat Transfer Augmentation In Ptcmentioning

confidence: 99%

Performance evaluation of solar parabolic trough receiver using multiple twisted tapes with circular perforation and delta winglet

Thapa

Samir

Kumar³

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…The intensification in heat transfer leads to an enhancement in higher heat flux [ 1 ]. To enhance the efficiency of the heat exchanger, it is very important to have better thermal contact and lower pumping power [ 2 , 3 ]. This benefit linked with HT enhancement explores different technologies and methods to facilitate the thermal performance of HE.…”

Section: Introductionmentioning

confidence: 99%

A review of different twisted tape configurations used in heat exchanger and their impact on thermal performance of the system

Khargotra

Kumar

Nadda

et al. 2023

Heliyon

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“…A thermohydraulic performance of 2.62 is obtained for SWH with delta winglets. Khargotra et al [8] examined the η p of SWH using non-circular holes in perforated delta-winglets. The results show that the perforated delta-winglets with circularity of 0.86, P B /H B of 0.5, α a of 450 and spacer length of 0 mm have optimum impact on Nu and f of the SWH.…”

Section: Introductionmentioning

confidence: 99%

Influence of artificial roughness parametric variation on thermal performance of solar thermal collector: An experimental study, response surface analysis and ANN modelling

Kumar

Nadda

Kumar

et al. 2022

Sustainable Energy Technologies and Assessments

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Impact of perforated shapes in delta type hindrance promoter on thermo-hydraulic performance of solar water heating system (An experimental study)

Cited by 29 publications

References 20 publications

Performance evaluation of solar parabolic trough receiver using multiple twisted tapes with circular perforation and delta winglet

Performance evaluation of solar parabolic trough receiver using multiple twisted tapes with circular perforation and delta winglet

A review of different twisted tape configurations used in heat exchanger and their impact on thermal performance of the system

Influence of artificial roughness parametric variation on thermal performance of solar thermal collector: An experimental study, response surface analysis and ANN modelling

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