| |
|---|---|
 (390Kb)
|
| MORI Yasuhumi | |
| Senior Researcher, Resources Management Research Section | |
| Social and Environmental Systems Division | |
| National Institute for Environmental Studies | |
| Environmental Agency | |
| Onogawa 16-2, Tsukuba, Ibaraki 305-0053, Japan | |
| Tel: +81-298-50-2539 Fax: +81-298-50-2572 | |
| E-mail: mori-y@nies.go.jp |
33,183,000 Yen
(FY 1999; 11,194,000 Yen )
There is a growing interest in utilization of unused but possible energy sources to reduce the carbon dioxide emission and the fossil-energy consumption. Amounts of the reductions, however, have not been fully estimated yet for the nationwide utilization of such energy sources.
Latent heat energy of river water and treated sewage water, and waste heat energy from incineration plant of municipal solid waste and underground train system were taken into calculation in the paper, where extractable energy, usable energy and effect on the fossil-energy saving were estimated. The extractable energy of river was derived from flow volume and water temperature, considering limitations of environmental and technical aspects. The usable energy was determined by applying to the extractable energy some equipment efficiencies such as heat loss efficiency in heat pipes. Fossil-energy saving was calculated by replacing a popularly used heating system with a system using the new energy sources.
The reduction in the carbon dioxide emission by nationwide use of the new energy sources was also estimated, which was about 10% of the reduction targeted by Japanese government in 1996. More detailed studies in consideration of plant location, land use and Life Cycle Analysis appeared to be valuable and needed to confirm the advantage of the new energy source usage.
We developed an estimating method for life cycle analysis of an unused energy utilizing system in consideration of matching supply to demand. Application of the methods to a certain area revealed that limitation of distance from heat source to the area was existing to gain energy saving and CO2 reduction.
Municipal Solid Waste Generation, Sewer, River Water, Temperature Difference Energy, District Heating and Cooling