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Analysis of a solar assisted micro-cogeneration ORC system 255 col collector cond condenser elect electrical in inlet input heat from the solar system and boiler HX heat exchanger out outlet pump pump reg regenerator solar solar tank thermal storage water water 1. Introduction Existing large-scale thermal plants for power generation are usually located far away from centres of population. This prevents efficient utilization of a reasonable proportion of the waste heat produced. Moreover, current technology limits these power stations to a maximum efficiency of about 40%, which, after the transporta- tion of electricity through the grid, is reduced to about 30% [1]. This means that vast quantities of fossil fuels are burnt with unwanted pollutants entering the atmosphere. Solar radiation availability in the Mediterranean area (Europe and North Africa) is excellent when compared with other regions of the World. However, this resource has been poorly utilised. The use of solar energy with conventional energy sources, for combined heat and power (CHP) in buildings, reduces pollutant emissions and offers energy savings. This cogeneration strategy is a major objective of the Euro- pean Union energy policy. Micro-generation is the decentralized production of electricity, through different means (micro-turbines, fuel cells, Stirling engines, small internal combustion engines, PV cells) with an electrical power output up to 50 kW. Micro-cogeneration, or micro-CHP, is the combination of micro-generation with useful heat. In this work, three solar assisted thermodynamic cycles for a micro-cogeneration system are studied. The thermodynamic cycles are based on the organic Rankine cycle (ORC) and the operating temperatures of solar thermal collectors are 80oC, 100oC–150oC and 200o–250oC, for cycles 1, 2 and 3, respectively. The micro- cogeneration system under analysis uses a micro-turbine and an electric generator with a power output of 5 kW. The main work objective is to model the selected cycles for optimisation according to the temperature range. The performance of several fluids was evaluated from a thermal and an economi- cal point of view, taking also into account fluid toxicity. The integration of the micro-cogeneration system with solar thermal collectors was evaluated and solar fractions were obtained for the climatic conditions of Almeria (Spain), Tunis (Tunis) and Cairo (Egypt). International Journal of Low Carbon Technologies 3/4PDF Image | Analysis of a solar assisted micro cogeneration ORC
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