The solar energy is an intermittent nature of source with diurnal variation. A constant rate of energy supply to a power plant can be achieved by using a hybrid solar-biomass system. In this system, parabolic solar collectors and biomass furnace have been arranged in parallel to supply thermal energy to an Organic Rankine cycle (ORC) based power generation system. A heat transfer fluid (HTF) is used to transport the solar energy and bio-energy. A feed control in biomass fuel with variable solar radiation is used. Solar energy is limited to a maximum share of 50% to avoid the operation of biomass combustion at low fuel feed rate in day time. A model for the system is developed and thermodynamic analysis is done. The performances of ORC system for three organic working fluids, R123, R134a and R600a, are theoretically studied and compared with same inlet turbine conditions (pressure and temperature) and variation in solar energy sharing to select a suitable working fluid. The focused results, for 1 k W of power generation, are thermal efficiency, aperture area of parabolic solar collectors, biomass feed rate, mass flow rate of HTF, mass flow rate of working fluid and volume flow rate in turbine
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