Heat transfer analysis of receiver for large aperture parabolic trough solar collector

Khandelwal, Deepak Kumar; Kumar, K. Ravi; Kaushik, S.C.

doi:10.1002/er.4554

Cited by 13 publications

(13 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The analysis is performed for the steady‐state condition using pressure‐based solver. The governing equation used in the FVM model is as follows 35 :…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Coupled optical and thermal analysis of large aperture parabolic trough solar collector

Malan

Kumar

2020

Int J Energy Res

Self Cite

View full text Add to dashboard Cite

Summary Large‐aperture parabolic trough solar collector (PTSC) has the potential to improve the performance of the solar field and also to reduce the capital cost of the power plant. In the present study, coupled flux distribution and thermal analysis of large aperture PTSC are presented by incorporating the limb darkening effect. MATLAB tool is used to develop the in‐house model to obtain the circumferential flux distribution on the absorber surface. The analyses are performed for different Sun shape models, the number of rays, aperture, rim angle, slope error, and receiver displacement on the flux distribution. The flux distribution for large aperture PTSC such as 7, 8, 9, and 10 m has also been studied with an available absorber diameter of 70, 80, 90 and 110 mm. Better manufacturing standards need to be incorporated to improve the performance of the large aperture PTSC with available receiver sizes. There is no significant effect on the intercept factor for the upward and downward displacement of larger aperture PTSC receiver, but the downward displacement of the conventional PTSC receiver drastically decreases the intercept factor. Based on the flux distribution analysis, a collector geometry having an aperture of 9 m with an absorber diameter of 110 mm has been considered for the thermal analysis. The effect of variation of the mass flow rate, aperture, and various heat transfer fluids are studied on the PTSC thermal performance. Liquid sodium offers the least thermal gradient around the absorber circumference, which leads to less deformation of the receiver from the focal length.

show abstract

“…The analysis is performed for the steady‐state condition using pressure‐based solver. The governing equation used in the FVM model is as follows 35 :…”

Section: Methodsmentioning

confidence: 99%

“…Agagna et al 39 provided an improved model for analysing the thermal efficiency of PTSC. Some researchers also investigated the performance of large aperture PTSC 35,40‐44 . Maatallah and Ammar 45 examined the effect of the secondary reflector to minimise the thermal stresses on the receiver tube.…”

Section: Introductionmentioning

confidence: 99%

Coupled optical and thermal analysis of large aperture parabolic trough solar collector

Malan

Kumar

2020

Int J Energy Res

Self Cite

View full text Add to dashboard Cite

show abstract

“…After comparing results with previous references, less than 10% relative error was recorded. Khandelwal et al studied the PTC thermal performance under different geometrical and operational parameters, various aperture diameters, different mass flow rates, and various working fluids. A considerable drop in the temperature gradient has been noticed when using liquid sodium compared with other fluids and the temperature profile on the circumferential direction became more uniform.…”

Section: Literature Review Of Ptcsmentioning

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

View full text Add to dashboard Cite

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

show abstract

“…A solution has been obtained for steady‐state conditions for the flow and radiation load. For the above‐mentioned conditions, the mass, momentum, and energy conservation equations for multiphase, steady‐state flow are given by Equations to , respectively:

\nabla ((), ρ_{m} . V_{m}) = 0,

\nabla ((), ρ_{m} . V_{m} . V_{m}) = - \nabla normalP + \nabla . ((), μ_{m} \nabla V_{m}) + \nabla . ((), \sum_{normalk = 1}^{2} ϕ_{k} ρ_{k} V_{dr, normalk} V_{dr, normalk}) - ρ_{normalm, normali} B_{m} g ((), T - T_{i}),

\nabla . \sum_{normalk = 1}^{2} ((), ρ_{k} C_{pk} ϕ_{k} V_{k} T) = \nabla . ((), K_{m} \nabla T) .

…”

Section: Modeling Approachmentioning

confidence: 99%

An innovative, high‐efficiency silver/silica nanocomposites for direct absorption concentrating solar thermal power

et al. 2020

View full text Add to dashboard Cite

Summary Using of nanofluids in the concentrating direct absorption solar collectors has the potential of reducing thermal losses because of the excessive temperature of the absorbing surface in the conventional solar collectors. However, increasing the concentration ratio of solar radiation must be followed by increasing the volume fraction of the nanoparticles, which, in turn, has the drawbacks of increasing the settlement and agglomeration rates of the nanoparticles. In this study, we have suggested using the plasmonic nanofluids for volumetric absorption in the concentrated solar power applications because of the less volume fraction of the plasmonic nanoparticles that are required to harvest the concentrated solar radiation. The interaction of concentrated solar radiation with different morphologies of silver nanoparticles coated by silica shell has been computationally studied. Then, the finite element method has been implemented to determine the photo‐thermal conversion efficiency for silver nanosphere and nanoplates with a silica shell. Silver nanoparticles coated by silica exhibit a promising potential because of their distinct characteristics. The silica shell is transparent to the visible and near‐infrared radiation bands; it also consolidates the intensity of the localized plasmon resonance and so the absorption characteristics, besides its protective role. A high‐efficiency low concentration nanofluid has been designed using blended morphologies of Ag nanospheres and nanoprisms with silica‐coating–based nanofluid for full‐spectrum absorption characteristics. The suggested nanofluid exhibits a promising performance at a volume fraction of 0.0075 wt% where the volumetric solar collector efficiency exceeds 75% under the solar concentration ratio of 50.

show abstract

Heat transfer analysis of receiver for large aperture parabolic trough solar collector

Cited by 13 publications

References 37 publications

Coupled optical and thermal analysis of large aperture parabolic trough solar collector

Coupled optical and thermal analysis of large aperture parabolic trough solar collector

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

An innovative, high‐efficiency silver/silica nanocomposites for direct absorption concentrating solar thermal power

Contact Info

Product

Resources

About