Research Article | OPEN ACCESS
Performance Analysis and Optimization of an Organic Rankine Cycle Coupled to a Fresnel Linear Concentrator for Various Working Fluids
1Sidi Bouhamady, 1Ababacar Thiam, 2El Bah Menny and 1Dorothe Azilinon
1Laboratoire d’Energétique Appliquée, Ecole Supérieure Polytechnique de Dakar, BP 5085 Sénégal
2Faculté des Sciences et Techniques, Université de Nouakchott, BP 880, Nouakchott, Mauritanie
Research Journal of Applied Sciences, Engineering and Technology 2017 5:176-186
Received: November 8, 2016 | Accepted: February 13, 2017 | Published: May 15, 2017
Abstract
The aim of this study is to model, optimize and analyze the performance of a micro power solar of 3 kW in order to meet the priority needs of Mauritania rural people in electric power and contribute to the reduction of greenhouse gases. The proposed system is composed of a Fresnellinear concentrator which is coupled to an Organic Rankine cycle with a regenerator. Several working fluids (R134a, R152a, R290 and R717) were used for better optimizing the system. Thus, many thermodynamic and physical parameters which are influent on the performance of the overall system were analyzed. This analysis shows that the R152a and R134a fluids are the best candidates for the applications of ORC solar at low temperatures. Indeed, a 5°C superheating, the overall system efficiency, the energy and exergy efficiency of the ORC cycle has been respectively improved to 7.7%, 16.1% and 14.4%. The Optimization made on the overall system allowed a 26% and 12% reduction of the surface of the concentrator and the volume flow out of the micro-turbine respectively. The minimum surface and volumetric flow rate required to produce 3 kW is respectively 21.25 m2 and 21.421 m3/h, this last result is achieved from the operating conditions: working fluid R152a, evaporation temperature which is 90°C and the direct normal radiation 1800 W/m2.
Keywords:
Areas rural, EES (engineering equation solver), energetic efficiency, fresnel linear concentrator, optimisation, organic rankine cycle, working fluids,
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Competing interests
The authors have no competing interests.
Open Access Policy
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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The authors have no competing interests.
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