Building a large-scale, sustainable groundwater heat source in Kumamoto, the Groundwater CityReduction of embodied carbon by approximately 87% with the continued use of existing stock and by reducing building size, reinforcing seismic resistance and extending service life*“Ryo (Cool)” continuous space with lush greenery and the first ever radiant air conditioning system in a theaterJapan’s first-ever initiative to create a Zero Water Building37th Society of Heating, Air-Conditioning and Sanitary Engineers of Japan (Technology Promotion Award)SAKURA MACHI RedevelopmentSakura Machi Kumamoto is a large-scale, mixed-use complex of commercial, cultural, lodging and residential functions centered around one of the largest bus terminals in Japan. We planned the installation of a large-scale and highly efficient groundwater heat source system, taking advantage of Kumamoto’s dis-tinctive characteristics as a “city of water”. We devised measures to enhance sus-tainability by preserving groundwater quantity and quality based on preliminary investigations and simulations, while minimizing impacts on surrounding areas. Close coordination and collaboration between designers, operation managers, and professional engineers successfully improved the operational performance of the heat source system while monitoring the groundwater environment in the surrounding area, achieving an annual primary energy conversion COP of 1.64. 18th Public Buildings Awards Public Buildings Association (awarded by the Minister of Land, Infrastructure, Transport and Tourism, Public Facilities Division)Seismic retrofitting, extension of building life and reduced size for the Aomori Prefectural OfficeMore than half a century since the completion of construction on the building in 1960, seismic deficiencies and aging had become significant issues. To address this, renovation work was carried out with the aim of ensuring seismic resistance and allowing the building to continue to be used for another century after con-struction. We reduced the size of the building (from 8 to 6 floors) and reinforced seismic performance, which required a minimal number of new seismic walls and created more flexibility in the design. The building has been designed to the latest standards in terms of functionality, energy efficiency, and safety, while adhering to the design principles of the original architect (Yoshiro Taniguchi, basic design). Approximately 40% of the hiba (cypress) on the exterior was reused from existing wood removed from the council hall and main entrance (due to specified ceiling measures and interior fireproofing work), in an effort to pass on a modern archi-tectural design that will be cherished by prefectural residents in years to come. Osaka Eco-friendly Architectural Award (Osaka Prefectural Governor Award)Osaka Climate Change Action Awards (“Ryo (Cool)” Design Architecture Award, Special Award)Hirakata Performing & Visual Arts CenterThe comprehensive Hirakata Performing & Visual Arts Center located in Hirakata City has been designed on the concept of creating a space where culture and arts inter-sect with greenery. A greening rate of 30% has been achieved with the incorporation of green spaces and shaded squares, which controls temperature rise in pedestrian spaces on the site. Rooftop gardens and greened eaves have also been included in the design to reduce thermal impacts outside the grounds. An inner courtyard and light court have been arranged to create a public space where visitors can experience abundant greenery wherever they look. Radiant air conditioning was installed in seating areas in the small and large halls in the theater for the very first time to create a comfortable space for audiences. This radiant air conditioning system improves energy efficiency by utilizing water recycled from highly treated sewage.World Architecture Festival Completed Buildings: Higher Education and ResearchWorld Architecture Festival GROHE Water PrizeKurita Innovation Hub The Kurita Innovation Hub is a new R&D center for Kurita Water Industries, which aims to create innovation to solve global water resource and water envi-ronment issues. Our challenge was to create a water circulation system that would reduce groundwater usage by reusing water and infiltrating rainwater into the site, which is returned to the groundwater, in order to reduce environmental impact. In the process of reusing water, wastewater separation is optimized, enabling both a high water recovery rate and low-energy operation. Curved metal pipes on the exterior of the building also create a soft impression of flowing water, while also providing solar shading, ventilation and rain gutter functions.*Comparison at the time of rebuilding5
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