Thermal-hydraulic performance and entropy generation analysis of a parabolic trough receiver with conical strip inserts

Liu, Peng; Zheng, Nianben; Liu, Zhichun; Liu, Wei

doi:10.1016/j.enconman.2018.10.057

Cited by 96 publications

(23 citation statements)

References 44 publications

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“…Of all the nanoparticles analyzed, the usage of copper based nanoparticles led to increased thermal performance in comparison to other metallic based nanofluids. The maximum gain in thermal efficiency as 23.72% is obtained in the investigation carried by Mahmoudi et al, 78 where receiver with forward [54] Twisted Tape [51] Conical Strips [58] Wall Detached Twisted Tape [50] Sinusoidal Fins [37] Pin Fin Array [44] Internal Fins [41] Metal Foam [30] Metal Foam [29] Porous Insert [26] Circular Toroidal Rings [22] Centrally Placed Perforated Plate [61] Wire Coils [64] Porous Rings [24] perforated ring steps with triangular cross-section has been used. 2.…”

Section: Advantages Of Nanofluidsmentioning

confidence: 97%

A review on passive methods for thermal performance enhancement in parabolic trough solar collectors

Sharma

Jilte

2020

Intl J of Energy Research

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Among the diverse renewable energy sources available, solar energy harnessing has become very common in most countries. Various collectors were developed, built and checked to work in various temperature ranges. The parabolic trough solar collector is found to be the most common among the other collectors in applications such as the distribution of process heat and the production of steam. The heat collector part known as receiver tube is one of the key practical devices of parabolic trough solar collector. Numerous research studies have centered on receiver tube to raise its thermal potential. The usage of passive techniques such as provision of inserts in the receiver tube and geometrical changes of receiver tube are efficient strategies for increasing thermal performance. Detailed review of the numerical and experimental studies conducted on heat transfer enhancement strategies that rely on the use of inserts with the use of different working fluids in a parabolic trough solar collector's receiver tube is described in this article. Additionally heat transfer enhancement due to geometrical modification of receiver tube is also presented. Further, on the basis of literature survey, a comparison among various strategies is outlined. These studies show that future work in this area, that is, usage of passive techniques in parabolic trough solar collector will offer further growth.

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Section: Advantages Of Nanofluidsmentioning

confidence: 97%

A review on passive methods for thermal performance enhancement in parabolic trough solar collectors

Sharma

Jilte

2020

Intl J of Energy Research

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“…According to results obtained based on the optimum star configuration, up to 60% enhancement in the heat transfer coefficient and 14% reduction in thermal losses whereas up to 900% increase in the pressure drop. Recently, Liu et al studied numerically conical strip inserts in the PTC system considering the effect of the geometrical parameters including a central angle, pitch ratio, and hollow diameter of inserts additional to different flow conditions. Results clarified that using this type of inserts led to an increase in the Nusselt number by 45% to 203% with a large reduction in both thermal losses and entropy generation reached to 82.1% and 74.2%, respectively.…”

Section: The Effect Of Inserting Swirl Generators On the Thermal Perfmentioning

confidence: 99%

An extensive review of various technologies for enhancing the thermal and optical performances of parabolic trough collectors

Abed

Afgan

2020

Int J Energy Res

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A wide range of engineering industrial applications require both the thermal and optical efficiencies of the system to be maximized with a reasonable low penalty for the friction factor and subsequently low losses in pressure. Among the family of concentrated solar power systems, parabolic trough collectors (PTCs), which have recently received significant attention, face similar challenges. The current work presents an extensive review of the PTC systems comparing recent and past technologies, which are widely being used to improve and enhance the thermal and optical efficiencies. Furthermore, the techniques used for single and two-phase flow modeling in numerical simulations, design variables, and experimental processes have been discussed in detail. The article also presents different numerical methods and analytical approaches of implementing the nonuniform solar distribution with different design parameters. Four main technologies are comprehensively addressed to effectively enhance the thermal performance of the PTCs; changing working heat transfer fluids, replacing the working fluids by nanofluids (single and hybrid) that have higher thermal-physical properties than those of base working fluids, inserting different tabulators with various design configurations, and finally combining the advantages of nanofluids and swirl generators in the same application. The article also critically summarizes the studies investigating the enhancement of thermal performance: use of novel design of PTCs and passive heat transfer enhancement techniques. Finally, a wide range of numerical and experimental studies are proposed for the future work related to the aforementioned main technologies. K E Y W O R D Sheat transfer enhancements, nanofluids, parabolic trough solar collectors, solar thermal energy, tabulators, thermal and optical performances

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“…According to the previous works [10][11][12][13], it is gratifying that the longitudinal swirl flow can be generated and bring in moderate flow resistance when the incoming fluid passes by an inclined rod or plate. Thus, a new insert is proposed as depicted in Figure 10.…”

Section: Structure Designmentioning

confidence: 99%

“…On the other hand, passive heat transfer enhancement techniques are popular in practical applications due to the essential advantage of no other direct external energy sources required [7]. In recent years, researchers around the world have proposed kinds of passive heat transfer enhancement techniques, such as treated surfaces, rough surfaces [8], fins [9], inserts [10][11][12][13][14][15], coiled tubes [16], corrugated tubes [17], and etc. [4].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Mechanism of Convective Heat Transfer Enhancement Based on Heat Convection Velocity Analysis

et al. 2019

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This paper explores the mechanism of convective heat transfer enhancement in a new perspective. In this paper, a new parameter called heat convection velocity is proposed based on the field synergy principle. It is defined as the velocity projection on the temperature gradient vector and reflects the magnitude of the velocity component that contributes to heat convection. Three typical cases are taken into consideration to investigate the influence factors of Nusselt number theoretically. The results indicate that the Nusselt number can be enhanced by increasing the mean heat convection velocity and the dimensionless mean temperature difference. Through theoretical analysis, three suggestions are found for designing heat transfer enhancement components: (a) the overall synergetic effect should be improved; (b) the fluid with lower temperature gradient should be guided to the region where the temperature gradient is higher; (c) temperature distribution should be an interphase distribution of hot and cold fluid. Besides, the heat convection velocity is used to investigate the mechanism of convective heat transfer in the smooth tube. It is found that the increase of Nusselt number is due to the increase of heat convection velocity. In addition, according to design suggestions, a new insert is invented and inserted in the circular tube. With heat convection velocity analysis, it is found that there is much potential of increasing heat convection velocity for enhancing the convective heat transfer in the circular tube.

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Thermal-hydraulic performance and entropy generation analysis of a parabolic trough receiver with conical strip inserts

Cited by 96 publications

References 44 publications

A review on passive methods for thermal performance enhancement in parabolic trough solar collectors

A review on passive methods for thermal performance enhancement in parabolic trough solar collectors

An extensive review of various technologies for enhancing the thermal and optical performances of parabolic trough collectors

A Study on the Mechanism of Convective Heat Transfer Enhancement Based on Heat Convection Velocity Analysis

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