Analysis of a solar assisted micro cogeneration ORC

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264 J. Facão et al. a high pressure. If we limit the pressure to 2500 kPa, cyclohexane presents the best performance. The integration of solar collectors, with and without a storage tank, in the micro- cogeneration system was analysed. The solar fraction for cycle 1 and cycle 2 was evaluated for Almeria, Tunis and Cairo. Comparing the 3 cities, Cairo presented the highest solar fraction for collector areas between 10 and 90 m2. The advantage of using thermal storage with a boiler as a backup is that the system may operate for longer periods (up to 24 h/day). Acknowledgements The authors wish to thank the European Commission for its financial assistance under the International Cooperation Activities Programme, ‘POWERSOL’ Project (contract INCO-CT2006-032227). The authors also wish to thank FCT of ‘Ministé- rio da Ciência, Tecnologia e Ensino Superior’ of Portugal, for partially funding the work done. References [1] A. C. Oliveira, C. Afonso, J. Matos, S. Riffat, M. Nguyen and P. Doherty, ‘A Combined Heat and Power System for Buildings Driven by Solar Energy and Gas’, Applied Thermal Engineering, 22 (2002), 587–593. [2] Freepower Ltd, 2005, http://www.freepower.co.uk. [3] Eneftech Innovation SA., Switzerland. www.eneftech.com. [4] K.Koai,N.LiorandH.Yeh,‘PerformanceAnalysisofaSolar-Powered/Fuel-AssistedRankineCycle with a Novel 30 hp Turbine’, Solar Energy, 32(6) (1984), 753–764. [5] S. A. Klein, ‘Engineering Equation Solver’, F-Chart Software, Middleton, USA 2007. [6] TRNSYS, A Transient Simulation Program. User’s Manual, Version 16, Solar Energy Laboratory, University of Wisconsin-Madison, 2005. [7] AES, Tunisia, www.aes-tunisia.com/. [8] AO SOL, Energias Renováveis S.A., Portugal, www.aosol.pt. International Journal of Low Carbon Technologies 3/4

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