抄録
Renewable energy obtained from natural resources, such as sunlight, wind, and biomass, has low energy density and a fluctuation property. Therefore, the energy shows intrinsic difficulties; energy-harvesting and leveling the variance of production. Supposing that the time-response of energy production by photosynthetic bacteria, one of biomass, with respect to daily sunlight differs from that in case of others, the combination of renewable energies is capable to solve the energy-leveling difficulties. This study focused on the fluctuation characteristic of bio-hydrogen produced by photosynthetic bacteria. As the experimental result of bio-hydrogen production in an imitated daily-sunlight, the production profile of bio-hydrogen showed a delay of 2-4 h to that of light-intensity. This characteristic was speculated to be different from that of other natural resources and found to be modeled with 2^<nd>-order system appropriately. This model would be useful for evaluating the combination system and understanding the internal mechanism of bio-hydrogen by photosynthetic bacteria.
