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Analysis of a solar assisted micro- cogeneration ORC system Jorge Facão, Ana Palmero-Marrero and Armando C. Oliveira (corresponding author) Faculty of Engineering, University of Porto (New Energy Tec. Unit), Rua Dr. Roberto Frias, 4200-465 Porto, Portugal E-mail: acoliv@fe.up.pt Abstract In this work, three solar assisted thermodynamic cycles for a micro-cogeneration system with a power output of 5 kW are studied. The thermodynamic cycles are based on the Organic Rankine Cycle (ORC) and the operating temperatures of solar thermal collectors are 80°C, 100°C–150°C and 200°–250°C, for cycles 1, 2 and 3, respectively. The main work objective was to model the selected cycles for optimisation according to the temperature range. The performance of several fluids was evaluated from a thermal and an economical point of view. The integration of the micro-cogeneration system with solar thermal collectors was evaluated and solar fractions were calculated for the climatic conditions of Almeria (Spain), Tunis (Tunis) and Cairo (Egypt). Keywords micro-cogeneration; solar energy; organic Rankine cycle; solar fraction Nomenclature A area [m2] cp fluid specific heat [J/kg/K] f solar fraction [-] k incidence angle modifier [o] h enthalpy [J/kg] i incidence angle [o] I. incident radiation on collector surface [W/m2] m water mass flow rate [kg/s] P pressure [Pa] Q thermal energy [J, kWh] Q. thermal power [kW] T temperature [oC] x. vapour quality [-] W electrical power [kW] Greek letters h efficiency [-] h0 optical efficiency [-] Subscripts amb ambient annual annual boiler boiler International Journal of Low Carbon Technologies 3/4PDF Image | Analysis of a solar assisted micro cogeneration ORC
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