0
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.

FIGURES IN THIS ARTICLE
<>
Copyright © 2013 by ASME
Your Session has timed out. Please sign back in to continue.

References

Odeh, S. D., Morrison, G. L., and Behnia, M., 1996, “Thermal Analysis of Parabolic Trough Solar Collector for Power Generation,” Proceedings of 34th Annual Conference, Australia and New Zealand Solar Energy Society (ANZSES), Darwin, Australia, October 22–25, pp. 460–467.
Eskin, N., 1999, “Transient Performance Analysis of Cylindrical Parabolic,” Energy Convers. Manage., 40, pp. 175–191. [CrossRef]
Forristall, R., 2003, “Heat Transfer Analysis and Modeling of a Parabolic Trough Solar Receiver Implemented in Engineering Equation Solver,” Technical Report No. NREL/TP-550-34169.
Naeeni, N., and Yaghoubi, M., 2007, Analysis of Wind Flow Around a Parabolic Collector (1) Fluid Flow, Renewable Energy, 32, pp. 1898–1916. [CrossRef]
Naeeni, N., and Yaghoubi, M., 2007, “Analysis of Wind Flow Around a Parabolic Collector (2) Heat Transfer From Receiver Tube,” Renewable Energy, 32, pp. 1259–1272. [CrossRef]
Xiao, J., He, Y. L., Tao, Y. B., and Xu, R. J., 2008, “Simulation for Concentrating Characteristics of Parabolic Solar Collector Part A: Analysis of Concentrating Characteristics,” 14th Annual Symposium of Chinese Society of Engineering Thermophysics, Tianjin, China.
Evens, D. L., 1977, “On the Performance of Cylindrical Parabolic Solar Concentrators With Flat Absorbers,” Sol. Energy, 19, pp. 379–385. [CrossRef]
Harris, J. A., and William, D. S., 1981, “Focal Plane Flux Distribution Produced by Solar Concentrating Reflectors,” Sol. Energy, 27, pp. 403–411. [CrossRef]
Jeter, S. M., 1986, “Calculation of the Concentrated Flux Distribution in Parabolic Trough Collectors by a Semifinite Formulation,” Sol. Energy, 37, pp. 335–345. [CrossRef]
Jeter, S. M., 1987, “Analytical Determination of the Optical Performance of Parabolic Trough Collectors From Design Data,” Sol. Energy, 39, pp. 11–21. [CrossRef]
Dudley, V., Kolb, G., Sloan, M., and Kearney, D., 1994, “SEGS LS2 Solar Collector—Test Results,” Report of Sandia National Laboratories, Report No. SANDIA94-1884.
Tao, W. Q., 2001, Numerical Heat Transfer, 2nd ed., Xi'an Jiaotong University Press, Xi'an, China.
ASM Material Data Sheet, http://asm.matweb.com or http://www.azom.com

Figures

Grahic Jump Location
Fig. 1

Parabolic trough collector and its absorber tube schematically

Grahic Jump Location
Fig. 2

Heat flux distribution around absorber tube after reflexing from mirror

Grahic Jump Location
Fig. 3

Algorithm of MCRT in matlab software

Grahic Jump Location
Fig. 4

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

Grahic Jump Location
Fig. 5

Effect of plug diameter on outlet temperature with three working fluids

Grahic Jump Location
Fig. 6

The diagram of plug displacement (=30 mm)

Grahic Jump Location
Fig. 7

The diagram of plug displacement (=50.8 mm)

Grahic Jump Location
Fig. 8

Efficiency diagram influenced of central plug diameter

Grahic Jump Location
Fig. 9

Efficiency diagram influenced of plug locations

Grahic Jump Location
Fig. 10

Variation of efficiency versus plug locations

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In