Development and Empirical Analysis of a Comprehensive LCA Assessment Framework Considering Housing Stock Dynamics.

住宅ストックの動態を考慮した包括的LCA評価フレームワークの開発と実証分析

CO₂ emissions from the housing and building sectors in Japan are said to account for about 40% of the total. While various measures have been taken to reduce CO₂ emissions, a detailed analysis of the dichotomous relationship between the reduction of CO₂ emissions during construction and the increase during use by extending the service life of houses, and the increase of CO₂ emissions during construction and the reduction during use by the spread of energy-saving houses has not yet been conducted. This study estimates the life-cycle CO₂ emissions of Japanese housing as a whole, taking into account the life span of the building as a whole and the composition of the stock by age, and investigates the trade-off relationship that occurs with the proliferation of longer-lived and energy-efficient housing through scenario analysis.

わが国の住宅・建築物分野の関わる部門からのCO₂排出量は、全体のおよそ4割を占めるといわれている。様々な策が講じられている中で、住宅の長寿命化による建築時CO₂削減と使用時の増加、省エネ住宅の普及による建築時CO₂の増加と使用時の削減という二律背反の関係については未だに詳細な分析がなされていない。本研究は建物総体としての寿命・ストックの築年数別の構成を考慮し日本の住宅全体のライフサイクルCO₂排出量の推計を行い、長寿命化や省エネ住宅の普及で発生するトレードオフ関係をシナリオ分析によって調査する。