Research Papers

Numerical Study and Optimization of Parabolic Trough Solar Collector Receiver Tube

[+] Author and Article Information
Anissa Ghomrassi

Unit of Thermal and Thermodynamics
in Industrial Processes,
National Engineering School of Monastir,
Monastir 5000, Tunisia
e-mail: ghomrassi.anissa@hotmail.com

Hatem Mhiri

Unit of Thermal and Thermodynamics
in Industrial Processes,
National Engineering School of Monastir,
Monastir 5000, Tunisia
e-mail: hatem.mhiri@enim.rnu.tn

Philippe Bournot

UMR CNRS 6595,
Technopôle de Château-Gombert,
5 Rue Enrico Fermi,
Marseille 13013, France
e-mail: philippebournot@yahoo.fr

1Corresponding author.

Manuscript received March 16, 2015; final manuscript received June 8, 2015; published online June 30, 2015. Assoc. Editor: M. Keith Sharp.

J. Sol. Energy Eng 137(5), 051003 (Oct 01, 2015) (10 pages) Paper No: SOL-15-1068; doi: 10.1115/1.4030849 History: Received March 16, 2015; Revised June 08, 2015; Online June 30, 2015

In this study, the parabolic trough collector's (PTC) performance is analyzed. In order to achieve this goal, the adopted procedure comprises two main steps. In the first step, the concentrated solar heat flux densities in the solar concentrator focal zone are calculated by soltrace software. In the second step, computational fluid dynamics (CFD) simulations are carried out to analyze and to optimize the thermal performance of the tube receiver. The calculated heat flux densities by soltrace software are used as wall heat flux boundary conditions for the receiver tube. The effect of the receiver tube diameter variation on the PTC thermal performance is studied. A new type of receiver tube is tested. This latter is covered with a metallic thickness. The performance of tube receiver covered with a metallic layer for different diameters is compared to those of the same diameters without the addition of metallic thickness. It has been found that increasing tube metallic thickness enhances the performance of PTC system comparing to the tubes of the same diameter and crossed by the same flow rates.

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Fig. 1

Comparison between the soltrace code and Jeter's [2] results by LCR distribution on the focal plane of PTC for solar radius of 16 in

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Fig. 2

Schematic of studied PTC

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Fig. 3

Schematic of tube receiver longitudinal cross section

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Fig. 4

Solar heat flux density distribution concentrated on the receiver tube periphery

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Fig. 5

Solar heat flux distribution reaching tube receiver periphery for different inner diameters

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Fig. 6

(a) Description of the receiver tube and (b) longitudinal and cross section mesh details

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Fig. 7

Velocity profiles for different cross sections

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Fig. 8

Temperature contour of tube receiver outlet surface

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Fig. 9

Working fluid outlet temperature for different inner tube diameters

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Fig. 10

Convective heat transfer coefficient for different tube receiver diameters

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Fig. 11

Thermal efficiency of the PTC for different tube receiver diameters

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Fig. 12

Glass envelope temperatures for different tube receiver diameters

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Fig. 15

Thermal efficiency for different tube receiver diameters with different metallic thicknesses

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Fig. 14

Convective heat transfer coefficients for different tube diameters (drn) with different metallic thicknesses

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Fig. 13

Working fluid outlet temperature for different inner tube diameters with and without extra metallic thicknesses




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