Abstract
Away from environmental pollution and the problems of fuel combustion to produce energy from gas turbines or steam turbines from converting water into steam, now the alternative to solar energy has become facilitated. Because the temperatures generated by was solar collectors do not reach the temperatures of heat exchangers, it necessary to use a different flow fluid from water with lower evaporation temperatures and higher heat transfer efficiency, such as organic matter. The current research tries to identify the greatest circulation fluid to enhance the casting ability of the Rankine cycle powered by concentrated solar energy. A concentrated solar collector was designed, assembled, and operated to produce enough steam into a heat exchanger that contains a brine solution to operate the Rankine cycle, which operates with organic fluid. Many liquids, such as R22, R123, R433a, R143a, R40, R601, R600a, RC318, R1270 and R290, have been tested from 90°C to 300°C. The results showed optimum system performance when using R601 as the Rankine cycle flow fluid, with a capacity improvement of approximately 24.6%.

Key words: Concentrated solar energy complex. Heat Exchanger; organic liquid; Power plant; Best performance