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evaporator pressure, the more the boiling temperature of fluid is closer to exhaust gas temperature the better power output will be the result (Costante Invernizzi, Paolo Iora, Paolo Silva, 2007). With respect to turbine efficiency, normally two factors are considered. Ratio between volumetric flow rate of outgoing and incoming fluid in addition to size factor are key parameters in choosing the right turbine. This will be discussed in chapter Ι‐1. Some candidate working fluids for this application can be found in Costante Invernizzi, Paolo Iora, Paolo Silva, (2007)17. For gas turbine exhaust temperatures of 300°C, esa-methyl- disiloxane is suggested by authors. Based on normal ORC cost of about 3500$/KW in 50 – 100 KW power range and micro gas turbine cost of about 1500 $/KW, total system cost will be about 2100$/KW. By this investment efficiency of the system will be increased from 30% to about 40.17 35 Ocean thermal energy conversion technology Ocean thermal energy can be utilized to drive an ORC. Warm see water can be used in evaporator while colder water in deeper parts of sea can be used in condenser. Small scale ORCs with possibility for low thermal heat source usages are suitable for this option.18 Temperature differences in evaporator and condenser are normally low and in order of 20°C. Working fluids can be refrigerants and benzene series fluids. This technology is in demonstration phase and is not highly commercially attractive yet (S.K. Wang, T.C. Hung, 2010).19 17 Costante Invernizzi, Paolo Iora, Paolo Silva. Bottoming micro‐Rankine cycles for micro‐gas turbines. Applied Thermal Engineering 2007; 27:100‐110. 18 T.C. Hung, S.K. Wang, C.H. Kuo, B.S. Pei, K.F. Tsai, A study of organic working fluids on system efficiency of an ORC using low‐grade, Energy 2009; 35: 1403–1411. 19 S.K. Wang, T.C. Hung, available at: http://esd2010.ueuo.com/esd2010cd/papers/S%2003/S%2003.4_Renewable%20Energy%20from%20the%20Sea.pdf; as accessed: 23.10.2010. 25PDF Image | Exergy
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