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イラク・ヒッラ市におけるラムドアースおよび伝統的壁構造の熱性能モデリング：比較シミュレーション研究

Thermal Performance Modeling of Rammed Earth and Traditional Wall Structures in Hilla City, Iraq: A Comparative Simulation Study (原題)

Zahraa Naser Azzam, Haider I. Alyasari, Zainab Malik, Maysoon Safi Yasir, Saba Salih Shalal, Ali Nadhim Shakir

Energies📚 査読済 / ジャーナル2026-09-11#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/en19184307
原典: https://doi.org/10.3390/en19184307
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🤖 gxceed AI 要約

日本語

イラク・ヒッラ市の住宅を対象に、DesignBuilder/EnergyPlusによる動的熱シミュレーションとLCAを統合し、4種の外壁システム（従来煉瓦、安定化・未安定化ラムドアース、フライアッシュ煉瓦）のエネルギー効率・冷房負荷・運用CO2を比較した。藁安定化ラムドアース（RE-S）が年間電力20.6%減、夏季ピーク冷房負荷35.3%減、冷房由来CO2 25.0%減と最大の削減効果を示し、フライアッシュ煉瓦は定量LCA対象3種のうち埋め込み炭素が最小であった。低炭素住宅には低炭素材料・外皮性能・運用効率を組み合わせた統合設計と、初期設計段階からのLCA組込みが不可欠と結論づける。

English

Using calibrated dynamic thermal simulation (DesignBuilder/EnergyPlus) and LCA, this study compares four external wall systems in a residential building in Hilla, Iraq. Straw-stabilized rammed earth (RE-S) cut annual electricity by 20.6%, peak-summer cooling load by 35.3%, and cooling-related CO2 by 25.0%, while fly-ash brick showed the lowest embodied carbon among the three LCA-assessed options. It concludes that low-carbon housing requires integrated design combining low-carbon materials, envelope performance, and operational efficiency, with LCA embedded in early design decisions.

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

日本では住宅・建築物の省エネ基準適合義務化やZEH普及、建材の埋め込み炭素（embodied carbon）開示への関心が高まっており、外皮性能と運用炭素を統合評価する本手法は、国内の建築LCAやCASBEE・建築物省エネ法対応の参考になる。ただし気候・建材慣行が異なるため、数値の直接適用ではなく方法論的示唆として読むべき。

In the global GX context

As global disclosure frameworks (ISSB, CSRD, TCFD) increasingly push building-sector embodied and operational carbon reporting, this study illustrates an integrated simulation-plus-LCA method for comparing wall systems on both energy and lifecycle emissions. It adds empirical evidence from a hot-arid, under-studied context (Iraq), complementing the predominantly temperate-climate building decarbonization literature.

👥 読者別の含意

🔬研究者:動的熱シミュレーションとLCAを統合し、埋め込み炭素と運用炭素を指標別に評価する手法の実例として参考になる。

🏢実務担当者:外皮材料の選択が冷房負荷・運用CO2・埋め込み炭素に与える影響を初期設計で比較検討する際の枠組みを提供する。

🏛政策担当者:建築物の省エネ規制や低炭素建材普及策を設計する際、ライフサイクル指標を政策評価に組み込む根拠となりうる。

📄 Abstract（原文）

This study investigates the impact of alternative external wall systems on energy efficiency, cooling loads, and operational CO2 emissions in a residential building in Hilla, Babylon, Iraq. An integrated assessment combining calibrated dynamic thermal simulation (DesignBuilder/EnergyPlus) and Life Cycle Assessment (LCA) was employed to evaluate thermal performance, operational energy demand, embodied carbon, and lifecycle emissions under consistent modeling conditions. The baseline model was calibrated against monthly electricity billing data, yielding an NMBE of +3.65% and a CV(RMSE) of 5.01%, indicating acceptable calibration performance for the investigated building and calibration period. Four wall systems were examined: conventional brick (BC), unstabilized rammed earth (RE-U), straw-stabilized rammed earth (RE-S), and fly-ash brick (FA). All four were evaluated using dynamic thermal simulation and operational-energy analysis, while the quantitative lifecycle environmental assessment was limited to BC, RE-S, and FA due to the lack of a sufficiently representative dataset for the unstabilized compacted-soil configuration (RE-U). The results highlight indicator-specific distinctions: RE-S achieved the greatest reductions in annual electricity consumption (20.6%), peak-summer cumulative cooling load (35.3%), and cooling-related operational CO2 emissions (25.0%); RE-U provided the most favorable free-running operative-temperature response on 31 July under non-mechanical cooling conditions; and among the three configurations included in the quantitative LCA, FA exhibited the lowest embodied-carbon benchmark. The LCA findings for BC, RE-S, and FA further demonstrate that environmental impacts vary across lifecycle stages and indicators, underscoring the importance of interpreting embodied and operational carbon within clearly defined methodological boundaries. The study concludes that achieving low-carbon housing requires an integrated design approach combining low-carbon materials, improved envelope performance, and enhanced operational efficiency, with lifecycle assessment incorporated into early design decisions to support sustainable outcomes.

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