The thermo-hydraulic performance of a parabolic trough collector with helically corrugated tube

Akbarzadeh, Sanaz; Valipour, Mohammad Sadegh

doi:10.1016/j.seta.2021.101013

Cited by 20 publications

(7 citation statements)

References 33 publications

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“…Similar results on the effects of the inner grooved tube and outer corrugated tube are reported by several researchers (Begag et al , 2021; Akbarzadeh and Valipour, 2021). Begag et al (2021) present an analysis on the enhancement of heat transfer using the instantaneous applying of concave and convex inner and outer corrugated tubes within a concentric mini-tube heat exchanger.…”

Section: Resultssupporting

confidence: 90%

“…This phenomenon also increases the pressure drop penalty between the inlet to the outlet, and therefore, increases the friction factor in the corrugated tube than the smooth one. The parameter PEC can illustrate which parameter, Nusselt number enhancement or pressure drop penalty, plays the main role by Similar results on the effects of the inner grooved tube and outer corrugated tube are reported by several researchers (Begag et al, 2021;Akbarzadeh and Valipour, 2021). Begag et al (2021) present an analysis on the enhancement of heat transfer using the instantaneous applying of concave and convex inner and outer corrugated tubes within a concentric minitube heat exchanger.…”

Section: Single-and Double-fluid Systemssupporting

confidence: 59%

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Hydrothermal characteristics of a double flow parabolic trough solar collector equipped with sinusoidal-wavy grooved absorber tube and twisted tape insert

Arani

Memarzadeh

2021

HFF

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Purpose Present investigation conducts a study on the hydrothermal features of a double flow Parabolic Trough Solar Collector (PTSC) equipped with sinusoidal-wavy grooved absorber tube and twisted tape insert filled with nanofluid. This paper aims to present an effectual PTSC which is comprised by nanofluid numerically by means of finite volume method. Design/methodology/approach The beneficial results such as pressure drop inside the absorber tube, mean predicted friction factor, predicted average Nusselt number and hydrothermal Performance Evaluation Criteria (PEC) are evaluated and reported to present the influences of numerous factors on studied interest outcomes. Effects of different Reynolds numbers and environmental conditions are also determined in this investigation. Findings It is found that using the absorber roof (canopy) can enhance the heat transfer ratio of PTSCs significantly during all studied Reynolds numbers. Also, it is realized that the combination of inner grooved surface, outer corrugated surface and inserting turbulator can improve the thermal-hydraulic characteristics of PTSCs sharply. Originality/value Novel PTSC (N.PTSC) filling with two Heat Transfer Fluids (HTFs), inner and outer surface corrugated absorber tube, absorber roof and inserting twisted tape (N.PTSC.f) has the highest PEC values among all novel configurations along all investigated Reynolds numbers which is followed by configurations N.PTSC with two HTFs and inserting twisted tape (N.PTSC.e), N.PTSC with two HTFs and outer surface corrugated absorber tube (N.PTSC.b) and N.PTSC with two HTFs and inner surface corrugated absorber tube (N.PTSC.c), respectively. N.PTSC.f Nusselt number values can overcome the high values of friction factor, and therefore is introduced as the most efficient model in the current study.

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Section: Resultssupporting

confidence: 90%

Section: Single-and Double-fluid Systemssupporting

confidence: 59%

Hydrothermal characteristics of a double flow parabolic trough solar collector equipped with sinusoidal-wavy grooved absorber tube and twisted tape insert

Arani

Memarzadeh

2021

HFF

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“…The results also show that the Heliovis inflatable collector fueled with diathermic oil has significant economic potential. Sanaz Akbarzadeh et al [6] parabolic vacuum collectors (PTCs) are often used to generate thermal energy. Considerable attention is paid to improving the thermal performance of the PTCs.…”

Section: Literature Reviewmentioning

confidence: 99%

Review on Thermal Analysis of Solar Parabolic Collector by using CFD

Kumar¹,

Arya²,

Vishwakarma³

2021

IJOSCIENCE

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Solar energy is one of the most freely available forms of clean renewable energy. Many technologies have been developed in India to obtain energy from various renewable energies, but obtaining maximum thermal energy from solar energy is the most promising challenge. This article introduces solar energy and the solar energy collector. The introduction of the parabolic by the collector is also described.

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“…which does not account for the effect of corrugation helical pitch p, because this was found to be negligible. Equation (11) provides a possibility for operation design, taking into consideration that the desired flow regime (laminar or turbulent) can be simply controlled by the corrugation height e.…”

Section: Heat Transfer and Pressure Drop In Helical Corrugated Tubesmentioning

confidence: 99%

“…Akbarzadeh et al [10,11] investigated the potential of applying a helical corrugated absorber tube in a parabolic trough collector (PTC), where the effect of different different pitch ratios and rib-heights ratios on the performance of the PTC was assessed. They concluded that corrugated tubes are very suitable for this type of application and present the highest performance in the transitional regime.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes

Cruz,

Mendes,

Pereira

et al. 2021

Preprint

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The internal flow in corrugated tubes of different helical pitch, covering from the laminar to turbulent regime, was studied in order to characterize the three-dimensional flow and the influence of corrugation geometry on pressure drop and convective heat transfer. With water as working fluid and an imposed wall heat flux, ranging from around 4 to 33 kW/m 2 , a numerical model was developed with a CFD commercial software, where k − ω SST was used to model turbulence. Experimental tests were performed covering Reynolds numbers in the range from around 300 up to 5000, which allowed to identify the transition region and validate the numerical model. The results show that due to the swirl induced by the corrugation, the critical Reynolds number for the start of transition to turbulent flow is reduced. The thermal performance factor, which quantifies the heat transfer enhancement at the expense of pressure drop, was used to compare the corrugated tubes against the reference case of smooth tube. Based on this, all investigated corrugated geometries performed better than the smooth tube, except for low Reynolds numbers (Re < 500) in the laminar regime.Overall, the corrugated tube with the lowest pitch showed a clearly better performance for the intermediate range of Reynolds numbers (1000 < Re < 2300), being an optimal choice for a wider range of operating conditions in the transitional and turbulent flow regimes.

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The thermo-hydraulic performance of a parabolic trough collector with helically corrugated tube

Cited by 20 publications

References 33 publications

Hydrothermal characteristics of a double flow parabolic trough solar collector equipped with sinusoidal-wavy grooved absorber tube and twisted tape insert

Hydrothermal characteristics of a double flow parabolic trough solar collector equipped with sinusoidal-wavy grooved absorber tube and twisted tape insert

Review on Thermal Analysis of Solar Parabolic Collector by using CFD

Experimental and numerical characterization of single-phase pressure drop and heat transfer enhancement in helical corrugated tubes

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