Exergy

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Figure 25: ORC in CHP system Source: Energy and Buildings 54 To clarify figure 25, the system poses a power generation unit (PGU). Waste heat from this unit can be either used in ORC or directly heating system of buildings. Heating in buildings are in forms of Hot water or heating coil. Electricity from ORC and PGU will be fed to grid. 2­2 Working fluids For solar applications, different setups of model and available results from a study by Joan Carles Bruno , Jesu ́s Lo ́pez‐Villada, Eduardo Letelier, Silvia Romera,and Alberto Coronas, (2008) shows that Benzene series same as n-propilbenzene will give better efficiencies for ORC; however cost and safety issues shall be considered as well. In general, isentropic fluids and especially wet fluids give more working area in T‐S diagram and better efficiencies rather than dry fluids. However, wet expansion of wet fluids limit their use, so isentropic and dry fluids are more applied (T.C. Hung a, S.K. Wang a, C.H. Kuo b, B.S. Pei c, K.F. Tsai, 2010). 54 Pedro J. Mago, Anna Hueffed, Louay M. Chamra, Analysis and optimization of the use of CHP–ORC systems for small commercial buildings, Energy and Buildings 2010; 42: 1491 – 1498. 67

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