Summary of Research Project Results under JSPS FY2001
"Research for the Future Program"

1.Research Institution Waseda University
2.Research Area Integrated Fields
3.Research Field Causes and Effects of Environmental Loading and its Reduction
4.Term of Project FY 1997 〜 FY 2001
5.Project Number 97I00501
6.Title of Project Sociological Experimental Study of Low Environmental Impact and Resource Circulation Habitation System

7.Project Leader
Name Institution,Department Title of Position
Toshio Ojima Waseda University, Engineering Dept.. Professor

8.Core Members

Names Institution,Department Title of Position
Kazuhiro Ueda University of Kyoto, Graduate School of Economics Professor

9.Summary of Research Results

 This research has presented the concept of the "Perfect Recycle House," described the design method and experiment system for two types of model houses and verified the result. A summary of the result of this research is as follows, (1) The following PRH concept was presented : in order to realize the perfect recycling of houses, it is necessary to establish the "recycling of buildings facilities." "Recycling of buildings" means the use of materials which are durable and capable of being recycled and adoption of dismantling-friendly building methods and "recycling of facilities" which aim to establish a circulatory system from the level of the site to the wider area. (2) Based on the PRH concept, two types of model houses were presented by thoroughly pursuing reuse and recycling; the reuse type of W-PRH based on the traditional wooden house method and the recycle type of S-PRH made of steel frame. (3) To evaluate the circulation of resources in this research, a "PRH Value" was suggested as one of the evaluation methods for the Life-Cycle Mass. (4) Comparing the W-PRH and S-PRH with conventional houses (wooden houses and light gauge steel frame houses) by PRH value, the PRH's were very good; W-PRH shows a PRH value of 170 and S-PRH value of 402. The PRH value for conventional houses were estimated as predicted value assuming maximum dismantling and separation and using LCA calculation model house data provided by the Japan Institute of Construction Engineering. (5) From the result of an actual building performance survey, both perfect recycling houses applied materials capable of recycling methods which did not use adhesives, showed good airtight performance and extremely low air contamination; they are found to produce a very healthy environment. (6) Both the Greenhouse in W-PRH and the Double-skin Space in S-PRH showed an increase of comfort and reduction of air-conditioning load, which confirms their validity. (7) The actual life experiment is still under way both in W-PRH and S-PRH, however, the results are almost as expected in each system; energy, water and waste. The effect of improvement at rebuilding will be clarified in future research.

10.Key Words

(1)Residence、(2)Resources circulation、(3)Low environmental load
(4)Reuse、(5)Recycling、(6)LCA evaluation
(7)Passive system、(8)Energy saving、(9)Eco-friendly