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Research Papers

Performance Testing of a Parabolic Solar Concentrator for Solar Cooking

[+] Author and Article Information
Ndiaga Mbodji

Process Engineering and Environment
Research Unit,
Institut Agronomique et Vétérinaire Hassan II,
BP 6202-Rabat-Instituts,
Rabat 10101, Morocco
e-mail: m.ndiaga@yahoo.fr

Ali Hajji

Process Engineering and Environment
Research Unit,
Institut Agronomique et Vétérinaire Hassan II,
BP 6202-Rabat-Instituts,
Rabat 10101, Morocco
e-mail: ahajji61@hotmail.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 August 12, 2015; final manuscript received March 22, 2016; published online May 23, 2016. Assoc. Editor: M. Keith Sharp.

J. Sol. Energy Eng 138(4), 041009 (May 23, 2016) (10 pages) Paper No: SOL-15-1259; doi: 10.1115/1.4033501 History: Received August 12, 2015; Revised March 22, 2016

The objective of the present work is to conduct a worthwhile experimental study of the performance of a parabolic solar concentrator for solar cooking. The literature survey briefly highlights the standard performance tests of solar cookers and gives the experimental studies obtained by some authors. Our experimental device, made from simple means using local materials, consists of a parabolic concentrator having a 0.80 m diameter and 0.08 m depth as well as a cylindrical absorber with a 0.10 m diameter and is 0.20 m long. The testing period started on April 24th, 2014 and continued till July 10th of the same year, in Rabat (33°53′ N, 6°59′ W), Morocco. The average ambient temperature is 24 °C. The results show that using synthetic oil as the heat transfer medium has achieved a maximum temperature of 153 °C against 97 °C with water. The overall heat loss coefficient is estimated to be 17.6 W m−2  °C−1. The energy and exergy efficiencies are, respectively, 29.0–2.4% and 0.1–0.5%. Adding a glass cover on the front face of the absorber improved the maximum temperature by 15 °C. Automatic two-axis sun tracking system also increased the maximum temperature by 13 °C compared to manual tracking system.

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Figures

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Fig. 1

Diagram of solar cooking with a heat storage system

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Fig. 2

Longitudinal section and photograph of the absorber

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Fig. 3

Detailed pictures of the built experimental setup: (a) complete system, (b) tracking mechanism, (c) photoelectric sensors, (d) glazing on the front face, (e) temperature sensor, (f) pyrheliometer, and (g) anemometer and temperature sensor

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Fig. 4

Time variation of the fluid temperature in the absorber using water, glazing, and manual sun tracking

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Fig. 5

Standardized cooking power using water, glazing, and manual sun tracking

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Fig. 6

Time variation of the energy and exergy efficiencies using water, glazing, and manual sun tracking

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Fig. 7

Time variation of the fluid temperature using SAE-40 synthetic oil, without glazing, and with manual tracking

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Fig. 8

Time variation of the fluid temperature using SAE-40 synthetic oil, glazing, and manual tracking

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Fig. 9

Time variation of the fluid temperature using SAE-40 synthetic oil, glazing, and automatic tracking

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Fig. 10

Geometric elements of the parabola

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Fig. 11

Time variation of the fluid temperature using SAE-40 synthetic oil, without glazing, and with manual tracking

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Fig. 12

Time variation of the fluid temperature using SAE-40 synthetic oil, glazing, and manual tracking

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Fig. 13

Time variation of the fluid temperature using SAE-40 synthetic oil, glazing, and automatic tracking

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