An analysis of performance of the power system utilizing waste heat energy exhaust gas and cooling water from marine engine for fishing vessels is conducted. The working fluid was using Trifluoroethanol (TFEA). A procedure is developed to maximize a net power of power system using of shell and plate type heat exchanger under the condition of designate power system. The maximum net power is given by minimizing of heat transfer area of the heat exchangers which consume most cost in total cost of a power system. The minimum value of objective function is about 3.1m^2/kW when the inlet temperature difference of exhaust gas and sea water is 376℃. The output power of marine engine for fishing vessels is obtained from an analysis of performance.
