A performance analysis of an OTEC system using the Uehara cycle is carried out when the mass fraction of ammonia, the temperature difference of heat source, and the performance of the heat exchanger are changed.
The thermal efficiency of the Uehara cycle becomes larger when the temperature difference between the inlet and outlet of warm sea water is smaller.As the mass fraction w₅ of ammonia is larger, the thermal efficiency of the Ueharacycle is larger because the extraction rate of the turbine ω is increased.The mass fraction of ammonia greatly depends on the performance of the plate type regenerator.