Abstract
Output characteristics of alternative-tank-type and submarine-type PRO power generation systems were examined with simulated experiments using a tailor-made two-partitioned hollow fiber permeator. For design of the permeator and analysis of experimental results, estimate calculations were carried out previously. Net power output calculated from the experimental data was about four times greater than that of the conventional system (pressurized-seawater-type) Specific power output per membrane area and per feed fresh water were attained about 0.5W/m2 and 0.1kWh/m3, respectively.
Energy conversion efficiency depends on the type of generating system and the operating condition.However, analysis showed that flushing by fresh water and decrease of concentration difference across the membrane by permeate water induce relatively big power losses. And also, the concentration polarizations on the surface and in the substructure of the membrane, and the pressure losses in the fluid passages affect power losses. To decrease these power losses for practical application, use of clean fresh water, improvement of the membrane characteristics, and optimum design of the permeator are required.
