Real-time thermal states monitoring of absorber tube for parabolic trough solar collector with non-uniform solar flux

Wang, Xiaojia; Zhang, Daqian; Zhang, Lihui; Jiang, Chuan

doi:10.1002/er.3856

Cited by 11 publications

(4 citation statements)

References 43 publications

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“…Transient analysis is adopted to account for the unsteady state radiation conditions that cause fluctuation in system temperature of a PTSC system. Wang et al have presented real‐time inverse analysis of thermal states of PTSC absorber tube. Nonuniform solar heat flux is monitored in real time, and inverse heat analysis is done to obtain the temperature field in the PTSC absorber tube.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of receiver of parabolic trough solar collector: Effect of selective coating, vacuum and semitransparent glass cover

et al. 2018

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Summary Present work encompasses developing a new methodology to incorporate the heat transfer characteristics of the evacuated space (vacuum) in the annulus region between the absorber tube and glass cover and the effect of selective coatings on the steel absorber tube for a 3‐dimensional computational fluid dynamics model of a parabolic trough solar collector (PTSC) receiver. In the present work, glass cover has been modeled semitransparent to the incoming solar flux, which has been applied on the glass cover. Wavelength‐dependent absorption properties of glass cover material also has been modeled. In the current work, the direct normal irradiation and the mass flow rate of heat transfer fluid (HTF) has been varied to check their individual effect on the performance of PTSC absorber tube. Circumferential temperature distribution of absorber tube and glass cover has been found out; heat transfer to HTF and pressure drop of HTF in the absorber tube have also been calculated. A comparative study has been undertaken to highlight the relative contribution of the vacuum and selective coating on the receiver performance. The value of circumferential temperature difference at mid‐length of absorber tube was found to be 14.78 K for 750 W/m2, which increases to 19.70 K for direct normal irradiation of 1000 W/m2. When vacuum is replaced by air in the annulus region, PTSC absorber performance decreases by 4.82%. Similarly, because of use of selective coating, the thermal efficiency of the receiver increased by 34.59%.

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Section: Introductionmentioning

confidence: 99%

Performance analysis of receiver of parabolic trough solar collector: Effect of selective coating, vacuum and semitransparent glass cover

et al. 2018

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“…Due to non-uniform concentration of solar radiation, the lower part of receiver tube becomes hotter. 17 This passive method of heat transfer enhancement makes a uniform distribution, by increasing heat transfer coefficient and by providing a proper path to the receiving heat. 10 Due to this method of heat transfer enhancement, there occurs a decrease in thermal boundary layer thickness, consequently turbulence increases.…”

Section: Thermal Enhancement In Parabolic Trough Solar Collectors [Ptsc]mentioning

confidence: 99%

“…The thermal strain is related to deformation problem and high temperature gradients. Due to non‐uniform concentration of solar radiation, the lower part of receiver tube becomes hotter 17 . This passive method of heat transfer enhancement makes a uniform distribution, by increasing heat transfer coefficient and by providing a proper path to the receiving heat 10 .…”

Section: Thermal Enhancement In Parabolic Trough Solar Collectors [Ptsc]mentioning

confidence: 99%

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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“…The geometry of a cylinder array is widely applied in industrial processes, i.e. heat pipe heat exchanger (HPHEX) in waste heat recovery system [1][2][3], rob bundles in nuclear reactor [4][5][6], pin-fin tubes [7][8][9], pin-fin heat sink for thermal management [10][11][12][13][14][15][16][17][18], solid oxide fuel cells (SOFCs) [19,20] and solar receivers in concentrated solar power(CSP) system [21][22][23]. Many studies focused on the convective heat transfer between the fluid and the bundles' surface.…”

Section: Introductionmentioning

confidence: 99%

A modified numerical integration method to calculate the view factor between finite and infinite cylinders in arbitrary array

Jiang

Wang

Behar

et al. 2020

Annals of Nuclear Energy

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The view factor has a critical impact on the estimation of the radiation heat transfer between different surfaces of energy systems. This paper presents an alternate and simple method for the blocking judgment and a modified numerical integration approach to calculate the view factor between finite and infinite length cylinders in an arbitrary array. The proposed method has been successfully validated through a comparison with the state-of-the-art published methods. Two cases are studied: (i) cylinders arranged in a staggered array for different spacing and lengths; (ii) cylinders arranged in an arbitrary array. The results show that the proposed method provides a fast and accurate way to evaluate the view factor for cylinder arrays with similar length. The analysis reveals that the length and arrangements have a strong influence on the view factor. The proposed method might be very useful to design an improved compact heat exchanger using a nonstandard arrangements.

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Real-time thermal states monitoring of absorber tube for parabolic trough solar collector with non-uniform solar flux

Cited by 11 publications

References 43 publications

Performance analysis of receiver of parabolic trough solar collector: Effect of selective coating, vacuum and semitransparent glass cover

Performance analysis of receiver of parabolic trough solar collector: Effect of selective coating, vacuum and semitransparent glass cover

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

A modified numerical integration method to calculate the view factor between finite and infinite cylinders in arbitrary array

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