The utilization of alternative energy is being strongly promoted in order to prevent the progression of climate change due to the increase in greenhouse gas emissions. Therefore, in our previous study, the carbon dioxide (CO 2 ) hydrate engine generator (CHEG), which converts unutilized energy to electrical energy, has been proposed as a way to produce alternative energy. CHEG uses the heat cycle of a CO 2 hydrate which is generated by a small temperature difference using heat from such unutilized energy sources as low-temperature exhaust heat from home heating appliances, difference in temperature between day and night, geothermal heat, etc. In previous works, the theoretical validity of the CHEG as an alternative energy for homes has been analyzed. However, the control method of power output for changing heat source temperature and power load has not been investigated. Therefore, the dynamic model of the CHEG is constructed to investigate the dynamic characteristics of the control method of power output.

When the mixed fluid of gas and water is pressurized and cooled to a given pressure and temperature, the generation of a gas-hydrate occurs. By heating, a very high pressure is obtained from the dissociated gas from the gas-hydrate. The purpose of this study is to investigate the operation of a high-pressure gas engine generator for distributed power supplies using the high pressure obtained though the dissociation of a gas-hydrate. A gas-hydrate functions as a working fluid and as a form of energy storage. However, until now, an actuator that uses the dissociation inflation characteristics of a gas-hydrate has not been examined. Therefore, the generation rate of CO 2 hydrate and the quantity to be stored from the dissociation expansion energy of CO 2 hydrate were investigated. As a result, when 1 m 3 of water was used to generate CO 2 hydrate for 480 minutes, the result was that electric power corresponding to approximately 45% of the daily power consumption (4.5 kWh of generator outputs) of an individual house can be stored.

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