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Research Papers

Curvature Variability Study for Small- and Large-Scale Linear Fresnel Solar Fields: A Step Toward Optimization

[+] Author and Article Information
Sara Benyakhlef

Renewable Energy Team,
Department of Energy,
Ecole Nationale Supérieure d'Arts et Métiers,
Moulay Ismail University,
ENSAM-Meknes, Marjane II,
BP: 4024, Beni Mhamed,
Meknes 50000, Morocco
e-mail: sara.benyakhlef07@gmail.com

Ahmed Al Mers

Renewable Energy Team,
Department of Energy,
Ecole Nationale Supérieure d'Arts et Métiers,
Moulay Ismail University,
ENSAM-Meknes, Marjane II,
BP: 4024, Beni Mhamed,
Meknes 50000, Morocco
e-mail: almers_a@hotmail.com

Ossama Merroun

New Energies and Innovation Ecosystems Team,
Mechanical Engineering Department,
Ecole Nationale Supérieure d'Arts et Métiers,
Hassan II University,
Ecole Nationale Supérieure d'Arts et Métiers, Avenue
Nile 150,
Casablanca 20670, Morocco
e-mail: meroun.ossama@gmail.com

Abdelfattah Bouatem

Renewable Energy Team,
Department of Energy,
Ecole Nationale Supérieure d'Arts et Métiers,
Moulay Ismail University,
ENSAM-Meknes, Marjane II,
BP: 4024, Beni Mhamed,
Meknes 50000, Morocco
e-mail: bouatem1@hotmail.com

Hamid Ajdad

Renewable Energy Team,
Department of Energy,
Ecole Nationale Supérieure d'Arts et Métiers,
Moulay Ismail University,
ENSAM-Meknes, Marjane II,
BP: 4024, Beni Mhamed,
Meknes 50000, Morocco
e-mail: ajdad.cmi@gmail.com

Noureddine Boutammachte

Renewable Energy Team,
Department of Energy,
Ecole Nationale Supérieure d'Arts et Métiers,
Moulay Ismail University,
ENSAM-Meknes, Marjane II,
BP: 4024, Beni Mhamed,
Meknes 50000, Morocco
e-mail: boutammachte@gmail.com

Soukaina El Alj

Renewable Energy Team,
Department of Energy,
Ecole Nationale Supérieure d'Arts et Métiers,
Moulay Ismail University,
ENSAM-Meknes, Marjane II,
BP: 4024, Beni Mhamed,
Meknes 50000, Morocco
e-mail: elalj.soukaina@gmail.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received March 3, 2017; final manuscript received July 1, 2017; published online August 22, 2017. Assoc. Editor: M. Keith Sharp.

J. Sol. Energy Eng 139(5), 051009 (Aug 22, 2017) (10 pages) Paper No: SOL-17-1075; doi: 10.1115/1.4037382 History: Received March 03, 2017; Revised July 01, 2017

Reducing levelized electricity costs of concentrated solar power (CSP) plants can be of great potential in accelerating the market penetration of these sustainable technologies. Linear Fresnel reflectors (LFRs) are one of these CSP technologies that may potentially contribute to such cost reduction. However, due to very little previous research, LFRs are considered as a low efficiency technology. In this type of solar collectors, there is a variety of design approaches when it comes to optimizing such systems. The present paper aims to tackle a new research axis based on variability study of heliostat curvature as an approach for optimizing small and large-scale LFRs. Numerical investigations based on a ray tracing model have demonstrated that LFR constructors should adopt a uniform curvature for small-scale LFRs and a variable curvature per row for large-scale LFRs. Better optical performances were obtained for LFRs regarding these adopted curvature types. An optimization approach based on the use of uniform heliostat curvature for small-scale LFRs has led to a system cost reduction by means of reducing its receiver surface and height.

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References

Figures

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Fig. 1

Curved mirror reflection characteristics

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Fig. 2

Small-scale LFR solar field installed at Ben Guerir city, Morocco

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Fig. 3

Seasonal optical efficiency (%) evolutions versus various deflection values f for two receiver positions (h = 3 m, h = 5 m) of the CLFR system at Ben Guerir, Morocco

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Fig. 4

Weighted annual average efficiency (%) evolution versus various deflection values f for two receiver positions (h = 3 m, h = 5 m) of the CLFR system at Ben Guerir, Morocco

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Fig. 5

Annual weighted average power (W) evolutions versus various deflection values f corresponding to heliostats rows: no. 1-2

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Fig. 6

Annual weighted average power (W) evolutions versus various deflection values f corresponding to heliostats rows: no. 3-4-5-6

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Fig. 7

Weighted annual optical efficiency (%) of the CLFR versus day time hours for candidate deflection values, for different flat receiver apertures rw: (a) rw = 0.5 m, (b) rw = 0.4 m, (c) rw = 0.3 m, and (d) rw = 0.2 m

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Fig. 8

Weighted annual Receiver power (kW) of the CLFR versus day time hours for a candidate deflection values for different receiver apertures rw: (a) rw = 0.5 m, (b) rw = 0.4 m, (c) rw = 0.3 m, and (d) rw = 0.2 m

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Fig. 9

CNIM solar field, variable curvature configuration

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Fig. 10

Seasonal optical performances (%) of the CLFR system obtained for both curvature configurations: uniform and variable

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