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Feaure | SPOTLIGHT12t0冷Cold side温Warm side冷Cold side温Warm side：：29夏期　冷房冷水Chilled water井戸（冷）※夏期、冬期で地下水を汲み上げる井戸を替え、熱源機の温冷排熱を帯水層に蓄熱。※The wells, which draw groundwater, are switched between summer and winter, and the heating/cooling waste heat from the heat pump is stored in the aquifer.駅北1号線Station North No. 1 Road下水本管（2,200Φ）Main sewer pipe (2,200-mm dia.)冬期　暖房帯水層Aquifer井戸（温）貯湯槽Hot water storage tank給湯｜Domestic hot water熱源水｜Heat transfer water北街区North area下水採熱パイプWastewater heat collection pipe南街区South area下水本管（2,000φ）Main sewer pipe (2,200 mm dia.)Summer (cooling)700kW66–100m3/h13℃Well (cold side)200mWinter (heating)860kWHP熱交換器Heat exchanger66–100m3/h23℃Well (warm side)Well for geothermal system and aquifer thermal energy storage (warm side)Well for geothermal system and aquifer thermal energy storage (cold side)230m105m100HP熱交換器Heat exchanger23℃13℃Well (warm side)Well (cold side)温水Hot water帯水層Aquifer井戸（温）井戸（冷）南街区公園South area parkシャワー・厨房Shower and kitchen水熱源HP給湯器Domestic water heater with water-source heat pump熱源水配管Heat treansfer water piping採熱パイプHeat collection pipeTaking advantage of the relaxation of underground water extraction regulations on buildings through the National Strategic Special Zone system, we have implemented Japan’s first large-scale aquifer thermal energy storage system.1 This system stores waste heat from cooling equipment in the summer within a gravel layer 45–55 meters belowground; this is then used for heating in the winter. Conversely, waste heat generated in winter is repurposed for summer cooling. This approach makes full use of the area’s geology, with high groundwater levels and thick gravel layers, to optimize energy efficiency. By reusing waste heat, the system not only reduces energy consumption but also mitigates heat island effects by limiting the amount of heat radiation released into the atmo-sphere. Additionally, a sewer heat utilization system,2which uses the underground infrastructure running east and west underneath the sidewalk between the South Park and North Park, has been integrated as a heat source for hot water in the park’s facilities.省CO2技術の平面プロット｜Plot plan of low-CO2 technologiesAdopted by the Ministry of Land, Infrastructure, Transport and Tourism's Sustainable Buildings Initiative (cutting-edge low-CO2 model).Selected for the Ministry of the Environment’s project to promote the introduction of renewable energy and reduce costs through new methods (support for the introduction of equipment utilizing unused heat).帯水層蓄熱システムイメージ｜Aquifer thermal energy storage system overview下水熱利用システムイメージ｜System overview of wastewater heat recovery Through the combined management of cogeneration systems and district heating and cooling in both the north and south areas of the park, it is possible to link with external energy sources and maintain energy independence during emergencies. The overall goal for Grand Green Osaka is to achieve a 35-percent reduction in CO2 emissions, which is equivalent to the carbon absorption of 9,700 hectares of forest (about 2,100 times the area of Umekita Park). This is the first mixed-use development in Japan, including urban parks, to achieve LEED for Neighborhood Development (LEED ND) Gold certification (plan certification) and SITES (Landscape) Gold certification (pre-certification).：熱源井と帯水層蓄熱範囲（温）：熱源井と帯水層蓄熱範囲（冷）：下水熱ヒートポンプ｜Wastewater heat pump：地中熱ヒートポンプ｜Geothermal heat pump