Research Papers

Numerical Simulation Coupled With MCRT Method to Study the Effect of Plug Diameter and Its Position on Outlet Temperature and the Efficiency of LS-2 Parabolic Trough Collector

[+] Author and Article Information
Omid Karimi Sadaghiyani

Department of Mechanical Engineering,
Khoy Branch,
Islamic Azad University,
Khoy 5881666763, Iran
e-mail: st_o.sadaghiyani@urmia.ac.ir

Iraj Mirzaee

Department of Mechanical Engineering,
Urmia University,
Urmia 7947664857, Iran

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received November 19, 2011; final manuscript received February 6, 2013; published online June 25, 2013. Assoc. Editor: Manuel Romero Alvarez.

J. Sol. Energy Eng 135(4), 041001 (Jun 25, 2013) (7 pages) Paper No: SOL-11-1250; doi: 10.1115/1.4024475 History: Received November 19, 2011; Revised February 06, 2013

Based on finite volume method, three-dimensional models are used to evaluate the effect of flow restriction device (plug) on outlet temperature and efficiency of LS-2 parabolic trough collector. In order to study the effect of plug, various positions of plug with different diameters are used as case-studies. In other hand, solar heat flux distribution on the outer wall of the receiver tube is calculated by Monte Carlo ray tracing method (MCRT). The MCRT method is applied and coupled with three-dimensional numerical methods, computational fluid dynamics (CFD), in order to study the effect of plug diameters and their positions on outlet temperature and efficiency of collector. The result of MCRT method shows nonuniform heat flux hits on outer wall of receiver tube. So, after simulation of absorber tube of LS-2 PTC, the nonuniform heat flux is applied in the computational code. In order to validate the numerical methods, the working fluid and physical simulated model and operating conditions are considered as Syltherm-800 and LS-2 parabolic trough collector which had been tested via Dudley et al. at Sandia National Research Laboratory (SNRL). After the validation of numerical method, several case-studies with variable plug diameter and plug positions are simulated. Other working fluids are also tested for modeling of mentioned case-studies too. Results show that if the amount of nondimensional displacement from center becomes +0.5, then outlet temperature will be gentler. It is independent of plug diameter and working fluid. Finally, the efficiency of each of cases is evaluated. Consider that, the evacuated receiver tube is utilized in simulation of parabolic trough concentrator (PTC) and therefore, the convective losses have been negligible.

Copyright © 2013 by ASME
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Fig. 1

Parabolic trough collector and its absorber tube schematically

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Fig. 2

Heat flux distribution around absorber tube after reflexing from mirror

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Fig. 3

Algorithm of MCRT in matlab software

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Fig. 4

The cross sections absorber tubes and their plugs (30 and 50.8 mm, respectively)

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Fig. 5

Effect of plug diameter on outlet temperature with three working fluids

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Fig. 6

The diagram of plug displacement (=30 mm)

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Fig. 7

The diagram of plug displacement (=50.8 mm)

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Fig. 8

Efficiency diagram influenced of central plug diameter

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Fig. 9

Efficiency diagram influenced of plug locations

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Fig. 10

Variation of efficiency versus plug locations




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