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4MPa, and has already been established as a basic standard technology. Moreover, the SPE system cost may also reduce substantially in the future [9, 33]. In the present study, the capacity of the fuel cell facility, the town gas consumption and the operational time of auxiliary machines is investigated by assuming the introduction of a fuel cell system with a water electrolyzer into an energy-demand model of a house, a hospital, a factory, a hotel, and a small store for 24-hour operation. These models are used as analysis examples.

On the other hand, electric power demand supplies and generates the gases in the gas cylinders to the fuel cell during a time zone with larger demand. The electric-power-generation characteristics of PEFC improve by supplying a higher concentration of oxygen to the cathode [29-32]. Therefore, hydrogen and oxygen are produced during time zones of smaller electric power demand, and the power load peak is leveled by using these gases for time zones of greater electric power demand. Although the capacity of the fuel cell stack has been decided until now using the output characteristics of the fuel cell at the time of electricity generation with reformed gas and air, in the operational method that will be proposed in this report, the capacity of the fuel cell stack can be decided from the output characteristics at the time of electricity generation with hydrogen and oxygen.

The model showing the relationship between the power load of the fuel cell system with a reformer and the generation efficiency of this system is shown in Figure 42 [23, 24, 29, 30]. The town gas consumptions of the conventional method shown in Figures 40 and 41 are calculation results when carrying out load-following operation using the characteristic of Figure 42. In the calculation results for each monthly representative day of each load pattern for the individual house, the hospital, and the factory, the reduction effect of the town gas consumption in System B is larger than the conventional method.

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