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As one of longest coastlines countries in the world where located in the tropical region, Indonesia has a prestigious potency of Ocean Thermal Energy Conversion (OTEC). In this paper, a study on working fluid of power plant generation based OTEC concept will be presented. Currently, ammonia is well known working fluid for OTEC applications. However, in this study it will be verified that the thermal efficiency of the OTEC can be improved significantly by adopting the Butene as the working fluid. Moreover, in term of mass flow rate, it needs only 4.21 kg/s of Butene to generate 100 kW output power.

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