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北North芋緑化により室外機周辺を冷却Outdoor equipment area cooled using sweet potato greening system 適切な間隔で室外機を配置Install outdoor units at appropriate intervals 将来の屋上防水更新を考慮した基礎形状での配置計画Installation plan with foundation shapes that take into consideration future rooftop waterproofing replacement 遮熱フィルム等を設置し外皮熱負荷軽減Reduce heat load on exterior skin with thermal insulation film, etc. 既存室外機の近隣への騒音リスクに配慮Consideration of noise from existing outdoor units for adjacent buildings芋緑化：芋葉の蒸散作用により室外機周辺の温度を下げる自然共生型の省エネシステム。Sweet potato greening system: Energy saving system in harmony with nature for lowering temperature of outdoor units area using transpiration of sweet potatoes.既存建物で採用可能なさまざまな省エネルギー手法を提案改修にあたっては、プロポーザルの与件でもあった空調エネルギーを50%削減するため、再生可能エネルギーの活用も含めたさまざまな省エネルギー手法を提案しました。　手法ごとに想定エネルギー削減率を数字で提示することで、提案に具体性をもたせるとともに、既存ビルにも採用可能な芋緑化システムなど、ユニークな手法も盛り込みました。アカデミックスタンダードとなる改修計画建物の劣化診断調査や中長期保全計画に精通したLCD専門チームにて設計を担当することで、単なる空調改修に留まらず、点検口の耐震補強など、既存建物のリスク改善にも配慮した改修計画としています。また、本プロポーザルでは、アカデミックスタンダードとなる改修計画の立案が求められており、日建設計は登録ZEBプランナーとして、グループ全体で共有する省エネルギー技術や設計知見を全面的に活用し、ZEB化のみならずバリューアップも含めた戦略型の提案を行いました。　加えて本計画は、建物を使用しながらの改修工事となるため、執務者への負担を極力低減するよう、基本設計段階で養生や工事工程案も含め施工計画全体をデザインしました。Energy-Saving Measures for the Existing BuildingTo meet the project’s goal of 50 percent reduction in HVAC energy use, we proposed a variety of energy-saving meas-ures, including use of recyclable energy. Numerical values for the estimated energy reduction for each energy-saving measure add substance to the propos-al, and unique approaches such as adding greenery to the building by planting sweet potatoes, a technique applicable to existing buildings, were included.Renovation Plan to Provide an Academic StandardBy forming a design team with expertise in life cycle design (LCD), including a medium- and long-term maintenance plan and degradation diagnosis investigation, we provided not just a simple HVAC renovation, but changes that also improve safety by enhancing the seismic resistance of inspection open-ings, etc. without impairing the original design of the building. As the project called for an academic standard model for ren-ovation design, we mobilized all of the energy efficiency and design know-how we shared as registered ZEB planners and afforded by the entire Nikken Group for a strategic proposal that not only addresses ZEB-related issues but increases build-ing value. In addition, because the renovation work would take place while the building was in use, the entire construc-tion plan was formulated during the schematic design phase to minimize the burden on office workers.Photography｜日建設計／Nikken Sekkei172019 AUTUMN40Feature | WORKS