Techno Economic Evaluation of Solar Dish Stirling System for Stand Alone Electricity Generation in Algeria

摘要

The Concentrated Solar Power (CSP) electricity production technology incorporates three essential and different designs: the parabolic trough, the power tower and Dish Stirling system. The Dish Stirling system consists of four components; the parabolic Dish, the thermal receiver, the Stirling engine and electrical generator. The modern Dish Stirling systems are recognized as the most efficient of the existing technologies for the solar to electricity conversion by converting nearly 31.25% of direct-normal incident solar radiation into electricity. On the other hand, these systems have reached in different countries around the world an important reliability degree and their cost has considerably decreased during the lasts years. Since 1970, several Dish Stirling systems ranging in size from 5-50 kWe were developed, installed and tested worldwide (USA, Spain, Germany, Italy, Australia...). This study presents, the results of an investigation concerning the application of two configurations of Dish Stirling system (prototype, mature) in order to use it as stand alone systems under the Algerian climate for three different sites (Algiers, Bechar and Tamanrasset). Furthermore, this study presents, the social and environmental impacts of using this technology. An analysis of the daily performances, monthly performances and annual performances for the three sites has been presented. In addition, an economic assessment of these systems has been performed. The results show that both Tamanrasset and Bechar are more suitable than Algiers site for the implementation of the Dish Stirling systems. Finally, we note from this study that the use of a Dish Stirling system for electricity production is competitive to both photovoltaic and conventional technology in the south of Algeria. Consequently, its application is suitable in the isolated rural areas.