高性能建築外皮における初期炭素と運用炭素のトレードオフの定量化

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:Provides a quantitative framework (Carbon Payback Time) for comparing envelope upgrades across different climates.

🏢実務担当者:Can use the CPBT results to justify high-performance envelope investments, especially for cold regions and east/west orientations.

🏛政策担当者:Supports updating building energy codes and lifecycle carbon benchmarks, especially for Japanese climate zones.

近年、建物のライフサイクル全体における温室効果ガス（GHG）排出量の削減が重要となっている。現在の設計では、建物の運用時に発生するエネルギー消費に起因する運用炭素（OC）の削減と、資材調達・製造・建設に起因する初期炭素（UC）の抑制の両方を目指すことが求められている。本研究では、中規模オフィスビルを対象に、高性能な建物外皮に関連するUCの増加とOCの削減との間のバランスを定量的に評価した。日本の気候特性と方位条件に応じた様々な外皮仕様の適用可能性を検討した。検討した高性能外皮は、Low-Eトリプルガラスと高性能ダブルスキンファサード（DS）であり、日本で一般的な仕様であるLow-Eダブルガラスと比較した。分析は、日本の省エネルギー地域区分における8つの気候区分を対象とした。OC削減効果は、UCの増加に対する炭素回収期間（CPBT）を用いて評価した。さらに、冷暖房負荷の観点から方位による効果を検証し、高性能化の優先度が高い方位を分析した。Low-Eトリプルガラスは、UC排出量の増加に対して高いOC削減効果を有し、全ての気候条件において、本検証で設定した想定寿命（30年）内での回収が可能であることが確認された。特に寒冷地では削減効果が大きく、約5年での回収が見込まれる。DSも寒冷地では顕著な削減効果を示し、20年以内での回収が見込まれた。一方、温暖地では、寿命内での回収を達成するためには、リサイクル材の使用などの材料面での検討が必要となる傾向が示された。方位分析では、太陽高度が低く日射の影響を受けやすい東面と西面で全地域において高い削減効果が示され、高性能化の優先度が高いことが示唆された。

AI 翻訳（deepseek-v4-flash）。 正確を期す場合は下の原文を参照してください。

In recent years, the reduction of Greenhouse Gas (GHG) emissions across the entire lifecycle of buildings has become critical. Design is now required to aim for both the reduction of Operational Carbon (OC), which is generated during a building's operation due to energy saving, and the suppression of Upfront Carbon (UC), which arises from material procurement, manufacturing, and construction. This study quantitatively evaluated the balance between the increase in UC associated with a high-performance building envelope and the reduction in OC, using a medium-sized office building as the subject. We examined the adaptability of various envelope specifications according to Japan's climate characteristics and orientation conditions. The highperformance envelopes studied were Low-E triple glazing and a high-performance Double Skin Façade (DS), which were compared to Low-E double glazing, a common specification in Japan. The analysis covered the 8 climate zones of Japan's energy-saving regional classification. The OC reduction effect was evaluated using the Carbon Payback Time (CPBT) against the increase in UC. Furthermore, the effect by orientation was verified from the perspective of heating and cooling loads, and the orientations with a higher priority for highperformance upgrades were analysed. It was confirmed that Low-E triple glazing offers a high OC reduction effect relative to the increase in UC emissions, and payback is possible within the assumed lifespan (30 years) set for this verification in all climate conditions. Specifically, in cold regions, the reduction is large, and payback can be expected in about 5 years. The DS also showed a significant reduction effect in cold regions, with a payback expected within 20 years. On the other hand, in warm regions, the tendency shown was that the materials used, such as the use of recycled materials, need to be considered to achieve payback within the lifespan. The orientation analysis indicated a high reduction effect in all regions for the East and West sides, which are susceptible to the influence of solar radiation due to the low solar altitude, suggesting they have a high priority for high-performance upgrades.

• openalex https://doi.org/10.1051/e3sconf/202671602005/pdffirst seen 2026-06-17 04:58:37 · last seen 2026-06-17 07:10:33