(738e) Design of the Smart Community Through the Use of EV In a University

Graduate school of Okayama Prefectural University

Yuu Notoji, Kazuya Shimohara, Tsuguhiko Nakagawa

The CO₂ emissions which is said to be one of the cause of global warming have been researched and developed to reduce all over the world. The smart community that is combined the fossil fuel and the renewable energy to manage the energy supply and demand by the use of IT technology is one of the important system. Representative renewable energy is solar power. It is influenced by the quantity of solar radiation and it is difficult to supply the electricity according to the demand. Therefore, it is considered that the surplus power is charged in a secondary battery when there is a surplus of the photovoltaic power generation and the shortage power is discharged from a secondary battery when there is a shortage of the generation. There is a limit in ability of the supply and demand control only through the use of the secondary battery when huge capacity of solar power is constructed in a factory and a university with huge electricity demand, because the construction cost of the secondary battery will be increased rapidly in proportion to the secondary battery capacity.

The authors have been studied the integration system that is combined with the energy conservation of air conditioning apparatuses, the construction of photovoltaic power generation and the using of the conversion electric vehicle(hereafter referred to as EV) which is used to be the internal-combustion engine vehicle. Additionally, high efficiency lighting and a power supply system which is connected with security has been considered.

In this study, the mathematical simulation model which is calculated the energy demand and supply of heat and electric power in the university has been developed on the basis of the more than a year investigation on the hourly demand and changes in the weather. The replacement of the air conditioning apparatuses and the energy demand changes have been calculated when photovoltaic power generation system and a lot of EV are introduced.

As a result, if heat pomp type air conditioner is replaced the absorption type, it is possible to reduce 70% of the CO₂ emission. As the feature of Okayama Prefectural university, 80 % of the commutation means is a private car and the average distance is within 30km/day. So the battery capacity of the EV can be changed to a small size. In addition, the photovoltaic power generation system can be generated 200kWh/(m²･year) of electricity around the university. So it is possible to construct the high cost performance system that is combined the EV with photovoltaic power generation.

In this paper, it has been proved that it is possible to reduce 40% or more CO₂ emission using the proposed integration system.