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炭素吸収源としての可逆的なバイオベース・プレファブリケーション：ドイツのストロー・パッシブハウスの全ライフサイクル評価

Reversible Bio-Based Prefabrication as a Carbon Sink: Whole-Life Cycle Assessment of a Straw Passive House in Germany (原題)

Nathalie Madeleine Santamaría-Herrera, Markel Arbulu, Alessandro Tonnarelli, Iñigo Rodríguez-Vidal, Rufino Javier Hernández Minguillón

Buildings📚 査読済 / ジャーナル2026-11-02#省エネ経営インパクト: コスト削減対象セクター: construction
DOI: 10.3390/buildings16214398
原典: https://doi.org/10.3390/buildings16214398

🤖 gxceed AI 要約

日本語

ドイツのストロー断熱を用いたプレファブ住宅のパッシブハウスについて、EN 15978準拠のLCAで建設時・運用時の炭素とエネルギーを評価した。ストロー断熱は材料段階で−40kg CO₂e/m²、壁部材で−38kg CO₂e/m²と炭素吸収源として機能し、建物全体でも建設時炭素はマイナスとなる。暖房需要12.95kWh/m²・年、一次エネルギー45.10kWh/m²・年でパッシブ基準を満たす一方、窓が環境ホットスポットである。

English

An EN 15978 life-cycle assessment of a prefabricated straw-insulated Passive House in Germany. Straw insulation shows negative embodied carbon (−40 kg CO2e/m² at material level, −38 kg CO2e/m² for wall components), and whole-building embodied carbon stays negative. Operational performance meets Passive House targets (heating 12.95 kWh/m²·yr, primary energy 45.10 kWh/m²·yr), though windows remain a major hotspot.

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

欧州の建築物炭素規制（EPBD改訂・EN 15978）に沿う実証で、日本でも非住宅建築物の省エネ法・建築物脱炭素やSSBJのScope 3算定における建設時炭素（embodied carbon）開示の議論に示唆を与える。バイオベース資材の炭素吸収源計上の扱いは国内開示ルール整備の参考になる。

In the global GX context

Directly supports the EU EPBD recast and whole-life carbon disclosure under EN 15978, offering quantified evidence that biogenic materials can push embodied carbon negative. It informs global debates on how biogenic carbon sequestration should be credited in building LCA and Scope 3 accounting.

👥 読者別の含意

🔬研究者:バイオベース資材の炭素吸収源計上と窓のホットスポット分析を、建物LCAの手法論として参照できる。

🏢実務担当者:建設時炭素の削減策としてストロー断熱プレファブの有効性と、窓のインパクト管理の重要性を実務に活かせる。

🏛政策担当者:建築物の全ライフサイクル炭素規制やバイオジェニック炭素の算定ルール設計の根拠として活用できる。

📄 Abstract（原文）

This study evaluates the embodied and operational energy and carbon performance of a prefabricated straw-based single-family Passive House in Germany, demonstrating the potential of biobased construction for building-sector decarbonization. A standardized life-cycle assessment (LCA) was conducted in accordance with EN 15978, covering embodied impacts in stages A1–A3 using Ubakus and operational energy in stage B6 using DesignBuilder over a 50-year service life. Global warming potential (GWP) and non-renewable primary energy demand (PENRT) were assessed at material, component, and whole-building levels. The building incorporates a highly insulated envelope (U < 0.15 W/m²K), where straw enhances thermal insulation, reduces embodied carbon, and improves passive performance. Results show that straw insulation exhibits negative embodied carbon at the material level (−40 kg CO₂e/m²) due to biogenic carbon sequestration. At the component scale, prefabricated straw infill timber wall systems act as carbon sinks (−38 kg CO₂e/m²) while maintaining moderate embodied energy demand. At the building scale, the total embodied carbon remains negative, confirming the dominant contribution of biobased materials. Operational performance is also significant, with a heating demand of 12.95 kWh/m²·year and total primary energy use of 45.10 kWh/m²·year, meeting Passive House requirements. However, windows remain a major environmental hotspot, contributing disproportionately to embodied carbon and energy impacts. Overall, the findings demonstrate that combining straw-based prefabrication with passive design strategies can substantially reduce both embodied and operational impacts, supporting the transition toward low-carbon and energy-efficient buildings within European regulatory frameworks.

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