|1.Research Institution||Osaka University|
|2.Research Area||Physical and Engineering Sciences|
|3.Research Field||Highly Efficient Use of Energy and Reduction of its Environmental Impact|
|4.Term of Project||FY 1997 〜 FY 2001|
|6.Title of Project||Distributed Autonomous Urban Energy Systems for Mitigating Environmental Impact|
|Name||Institution,Department||Title of Position|
|Kiichiro, Tsuji||Osaka University, Graduate School of Engineering||Professor|
|Names||Institution,Department||Title of Position|
|Mikio, Kasahara||Kyoto University, Graduate School of Energy Science||Professor|
|Minoru, Mizuno||Osaka University, Graduate School of Engineering||Professor|
|Toshifumi, Ise||Osaka University, Graduate School of Engineering||Associate Professor|
9.Summary of Research Results
The purpose of this investigation is to establish the concepts of "Integrated Energy Service System" and
"Integrated Recycle System" in urban areas that are energy efficient and environmentally compatible.
For the Integrated Energy Service System, three planning models have been developed each of which is based on multi-objective mathematical optimization. These models can deal with the tradeoffs between primary energy consumption, CO2 emission and cost. Various energy systems for urban area that correspond to non-inferior solutions are identified. A computer supported planning system that can be used on internet has been developed. This system is based on the developed mathematical optimization models and enables energy system planners to explore variety of alternative systems including distributed generators such as PV cells and micro co-generation. See http://t-www.pwr.eng.osaka-u.ac.jp.
A concept of Integrated Recycle System that includes various recycle techniques contributing to the better environment has been proposed. On the technical side, new materials which disassembles by itself and saves energy when it is recycled, and also, a biomass conversion system which uses supercritical water for instantaneous hydrolysis and produces glucose from cellulose, have been developed. From system analysis side, methods for evaluating the effects of pollutants discharged from production activity, daily life and transportation in urban area has been established, and then the effects of introducing recycle system have been evaluated. An inventory database was constructed and it is publicly available at
For the purpose of constructing an end-use energy demand database, measurement of electricity and city gas demand in residential houses has been carried out. The first stage of the monitoring project was from Oct. 1998 until Nov. 1999. The second stage was from Dec. 1999 until May of 2001. Daily load curves for each of end-use such as space heating and cooling have been acquired successfully. The acquired data will be useful not only for comprehensive understanding of residential energy use but also for planning better energy systems in residential area.
A new electric energy distribution network that is referred to as FRIENDS (Flexible, Reliable and Intelligent Electric eNergy Delivery System) has been explored from both hardware and software points of view. The new system enables multi-menu service differentiated by the quality of electric power through Quality Control Center. Various circuit configurations have been proposed and one of which has been patented both in Japan and in USA.
With all of these developments and a number of case studies for actual cities, a concrete image of "autonomous distributed urban energy systems" has been drawn and visually demonstrated.
(1)Urban Energy System、(2)FRIENDS、(3)District Heaking and Cooling
(4)Cogeneration、(5)Material Recycle、(6)Biomass Utilization
(7)Inventory Data、(8)End-use Demand Monitoring、(9)Life Cycle Assessment