NyearsNyears─省エネルギー化のシナジー 2025 SUMMER63Feature | PERSPECTIVES建築ストック全体評価｜Overall building stock assessmentOutputN+1yearsN+2yearsN+3yearsOutputN+1yearsN+2yearsN+3yearsInputInputBEI 1.0BEI 0.8Level 1外壁改修Building envelope repairImproved building envelope performance/reduced thermal loadLowEガラス断熱改修Low-E glass/insulation retrofitBEI 0.6Level 2設備改修Equipment renovationLevel 3ZEB化改修ZEB-oriented retrofitLED lighting conversion/high-efficiency heat source/introduction of control systemsUtilization of renewable energy/solar power/groundwater heat/natural ventilationBEI 0.5Energy management各レベルでの効果保障Performance assurance at each level照明LED化高効率熱源各種制御導入再生可能エネルギー活用太陽光井水熱自然換気照明Lighting空調Air conditioningストック全体試算結果Overall stock estimation results現状BEI値確認Confirmation of current BEI value現状負荷調査Assessment of current loadストック全体試算結果Overall stock estimation results設備容量再検討Reevaluation of equipment capacity既存Existing equipment省エネルギー化可能性検討試算結果統合Consolidated estimation results試算結果統合Consolidated estimation resultsLevel ０現状Current conditionN+XyearsZEB ReadyN+XyearsEnergy Efficiency Feasibility StudyZEB Ready達成！ZEB Ready achieved!Level 4運用Operationエネルギーマネジメント換気Venti-lation給湯Hot water supply昇降機Elevators照明Lighting太陽光Solar power21詳細調査を実施します。続いて建物のエネルギー消費を低減するための要素技術と費用の組み合わせを簡易リストで見える化し、今後の改修工事の指標を作成します。これが、設計に着手する前の「省エネルギー化可能性検討」です。要素技術の組み合わせによる煩雑な省エネルギー計算や、物価上昇を見据えての工事費概算を含む改修設計のノウハウが求められ、日建設計ではこれまで積み重ねてきた経験を活かし、官民を問わぬニーズの高まりに応えています。省エネルギー改修された建物は、非常時も省エネルギーなので自ずとレジリエンスが強化されます。また、断熱改修では快適性や生産性の向上の見通しが立つうえに、環境認証の取得も容易となり優良企業の入居など事業性の向上も期待できます。これらの取組みに対しては環境省などの補助制度も充実しています。建築ストックの省エネルギー化はさまざまなシナジー効果を生み、社会課題である建築ストックの資産価値向上につながることになります。外皮性能向上熱負荷低減空調Air conditioning50%削減50-percent reduction一次エネルギー消費量｜Primary energy consumptionis to develop an energy reduction roadmap outlining the scale of potential energy-efficiency improvements and projected costs leading up to the years 2030–2050. After narrowing down the candidates, detailed surveys are conducted; this includes on-site inspections and a review of renovation history. This is followed by the creation of a basic list of technologies and cost estimates to guide future renovation work—a pre-design step known as an energy efficiency feasibility study. This phase demands expertise in complex energy modeling based on strategic combinations of retrofit technologies and the ability to perform cost estimation accounting for inflation. Nikken Sekkei has acquired this exper-tise through extensive experience, enabling the firm to respond to the needs of both public- and private-sector projects.─Energy Efficiency Upgrades as a Synergistic BenefitBuildings that have undergone retrofitting for energy efficien-cy naturally become more resilient in emergencies, thanks to their reduced energy demands. Insulation improvements not only enhance comfort and productivity but also make it easier to obtain environmental certifications, making buildings more attractive to high-quality tenants and increasing their overall market appeal. Energy-efficiency retrofitting projects are fur-ther supported by subsidy programs from the Ministry of the Environment and other government bodies. Energy retrofitting of the building stock generates synergistic benefits that not only address pressing environmental issues but also increase the asset value of existing structures.
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