建物改修におけるライフサイクル気候影響とコストへの時間的視点の影響探索
Exploring effects of temporal perspectives on life cycle climate impact and costs in building renovation (原題)
Liza Sällström Eriksson, Sofia Lidelöw
🤖 gxceed AI 要約
日本語
亜寒帯気候の集合住宅の外皮・換気改修を対象に、LCAとWLCを100年間で時系列評価し、集計結果との差を検証した。時間分解分析は改修パッケージの相対性能がいつ・なぜ逆転するかを示し、分析期間の設定が順位を左右することを明らかにする。エネルギー脱炭素が進むほど気候影響はembodied排出へ移行し、コスト上昇率が高いほど運用費削減の重要性が増すが投資回収は困難である。
English
This study applies time-resolved LCA and whole life costing over 100 years to envelope and ventilation renovations of a multi-residential building in a subarctic climate. Time-resolved results reveal when and why renovation rankings shift, unlike aggregated assessments. Energy-mix decarbonisation shifts climate burden to embodied emissions, while higher cost escalation raises the value of operational savings, though investments are rarely fully recouped.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本では建築物省エネ法・ZEH・LCCM住宅など改修の脱炭素評価が政策課題化しており、長期の気候影響とコストを時系列で捉える手法は、不動産・建設セクターの移行計画や統合報告での長期シナリオ開示に示唆を与える。
In the global GX context
As ISSB/CSRD push long-horizon transition planning, this work shows why aggregated LCA/WLC can mislead: temporal parameters and analysis periods change which renovation strategies look best. It supports more robust, time-resolved disclosure of building decarbonisation pathways and embodied-vs-operational trade-offs.
👥 読者別の含意
🔬研究者:LCA・WLCに時間分解と動的要素を組み込む方法論的意義と、集計結果との乖離を定量化する枠組みを提供する。
🏢実務担当者:改修投資の意思決定で、分析期間やエネルギー脱炭素・コスト上昇率の前提が長期の気候・コスト評価と回収性をどう変えるかに留意すべき。
🏛政策担当者:建築改修の脱炭素政策評価において、集計値ではなく時系列・長期シナリオでの評価枠組みの必要性を示唆する。
📄 Abstract（原文）
Life cycle (LC) building renovation studies typically present aggregated results that cannot capture the accumulation of emissions and costs over time, particularly in future scenarios. This study explores the influence of temporal perspectives on life cycle assessment (LCA) and whole life costing (WLC) outcomes for envelope and ventilation renovations of a multi-residential building in a subarctic climate. Cumulative climate impact and costs are evaluated over a 100-year period, enabling comparison of time-resolved and aggregated results while also testing sensitivity to four key temporal parameters related to future energy systems, technological development, and cost escalation. Although not a dynamic LC study per se, it incorporates dynamic elements through time-resolved results and temporal developments. Time-resolved LC analysis provides greater nuance than aggregated assessments by revealing when and why the relative performance of renovation packages changes over time. Comparing the rate and direction of climate impact and cost trajectories clarifies long-term renovation performance and illustrates how rankings depend on the selected analysis period. Furthermore, temporal parameters influence renovations’ long-term climate and cost performance. Energy mix decarbonisation strongly influences climate-impact trajectories, shifting the burden towards embodied emissions, especially in regions with low-emission energy supply. For WLC, higher cost escalation rates increase the relative importance of operational savings, but investments are rarely fully recouped. While temporal perspectives do not necessarily alter the relative performance of different renovation strategies, their inclusion enables more robust evaluation over long time horizons by clarifying future uncertainties and revealing strategies that align long-term climate mitigation with economic constraints.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.buildenv.2026.115222first seen 2026-09-26 04:39:24
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