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 m<sup>2</sup> and 21.421 m<sup>3</sup>/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/m<sup>2</sup>.
Highlights
The lack of energy means the fact of not having access to necessary energy services
The aim of this work is to study the performance and optimization of a microcentral solar power plant of 3 with recuperator kW,working with critical temperature working fluids ranging from 80 °C to 130 °C
This study focuses on the analysis of performance and the optimization of an organic Rankine cycle coupled to a Fresnel linear concentrator
Summary
The lack of energy means the fact of not having access to necessary energy services. Most people in developing countries are affected by this tragic phenomenon especially people from rural areas. According to the works of Kuo et al (2009) the efficiency of photovoltaic modules commercially available is lower of 10 to 15% than that of solar thermal modules which means that CSP technology is more competitive than photovoltaic technology. The conversion of these solar resources into electricity is not economically profitable by the conventional Rankine cycle because of their low temperature heat (Chen et al, 2010). Among the various energy conversion cycles at low temperature, the organic Rankine cycle is less complex and maintained with a competitive cost of investment contrary to the other cycles (Chen et al, 2010)
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