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Research Papers

Optical Modeling and Analysis of the First Moroccan Linear Fresnel Solar Collector Prototype

[+] Author and Article Information
Soukaina El Alj

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

Ahmed Al Mers

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

Ossama Merroun

New Energies and Innovation Ecosystems Team,
Laboratory of Physical Chemistry of Applied
Materials (LPCMA),
Ecole Nationale Supérieure d’Arts et Metiers,
Avenue Nile 150,
Casablanca 20670, Morocco
e-mail: merroun.ossama@gmail.com

Abdelfattah Bouatem, Noureddine Boutammachte, Hamid Ajdad, Sara Benyakhlef, Yousra Filali Baba

Renewable Energy Team,
Department of Energy,
Ecole Nationale Supérieure d'Arts et Métiers,
University Moulay Ismail,
Marjane II, BP: 4024, BeniMhamed,
Meknes 50000, Morocco

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 October 26, 2016; final manuscript received April 21, 2017; published online May 25, 2017. Assoc. Editor: Carlos F. M. Coimbra.

J. Sol. Energy Eng 139(4), 041009 (May 25, 2017) (12 pages) Paper No: SOL-16-1459; doi: 10.1115/1.4036726 History: Received October 26, 2016; Revised April 21, 2017

Recently, linear Fresnel reflectors (LFR) arouse an increasing interest by the scientific and industrial community and have had a really fast development in the domain of concentrated solar power (CSP). LFR is considered as a promising technology which could produce an optical performance lower than those of parabolic trough collector, but its component simplicity would allow high cost reductions in its manufacturing compared to high investment costs of parabolic troughs. The purpose of this paper is to analyze the optical performances of an LFR prototype developed in the framework of CHAMS project, Morocco. The development of this prototype comes to supply industrial applications needing heat at small to medium temperature levels. To achieve this objective, an optical code based on the Monte Carlo (MC) ray tracing technique was developed for optical optimization purposes. The developed code identifies geometrical parameters that have a greater influence on optical efficiency of the LFR system as the mirror spacing arrangement, the receiver height, the receiver geometrical configuration taking into account the secondary reflector shape, and the absorber tube diameter. An analysis is conducted to identify the contribution of each mode of optical losses (blocking, shading, cosine…) in the optical efficiency of the system. Then, an optimization procedure is applied to enhance the optical performances of the prototype.

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Figures

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Fig. 1

Schematic representation of the LFR prototype constituted of four modules with an aperture receiver flat plane

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Fig. 2

Schematic representation of a single mirror unit reflecting radiation to the receiver aperture plane

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Fig. 3

Monte Carlo algorithm describing the path of incident sun rays through solar field components

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Fig. 5

Mirror orientation angle ψ and its determinants for: (a) mirrors located at the left of the receiver and (b) mirrors located at the right of the receiver

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Fig. 6

Flowchart of opsol code

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Fig. 7

LFR solar field module reproduced using opsol code

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Fig. 8

Comparison between simulation results between opsol and Tonatiuh: diurnal power collected over the aperture plan for typical days of the year, representing thereby the four seasons: (a) autumn and winter and (b) spring and summer

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Fig. 9

Diurnal optical efficiency, shading, and blocking effects obtained by opsol and Tonatiuh codes for real measured DNI along the day May 12, 2015 via a solar monitoring station installed in Meknes (33° 53′ 36′′ N, 5° 32′ 50′′ O)

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Fig. 10

Schematic representation of the geometrical parameters investigated for optimization purpose

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Fig. 11

Optimization results obtained using opsol code for two seasons (1—summer and 2—winter): (a) averaged amount of shading and blocking losses (W/m2) and (b) averaged optical efficiency (%)

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Fig. 12

Percentage of heliostat surface that suffers shading along a summer day (a) and along winter day (b) versus the normalized transversal mirror position

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Fig. 13

Average optical efficiency values according to the height and width of the receiver

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Fig. 14

Average optical efficiency values according to the diameter and position of the absorber tube

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Fig. 15

Front view of the LFR prototype developed

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