Evaluation of the impact on the subsurface thermal environment by ground source heat exchanger system

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K00595
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental engineering and reduction of environmental burden
• Research Institution: Center for Environmental Science in Saitama
• Principal Investigator: HAMAMOTO HIDEKI 埼玉県環境科学国際センター, 土壌・地下水・地盤担当, 専門研究員 (40511978)
• Co-Investigator(Kenkyū-buntansha): 八戸 昭一 埼玉県環境科学国際センター, 土壌・地下水・地盤担当, 担当部長 (70415397) ; 宮越 昭暢 国立研究開発法人産業技術総合研究所, 地質調査総合センター, 主任研究員 (30392666)
• Research Collaborator: Miyashita Yuji ; Koizumi Ken ; Ishiyama Takashi ; Kakimoto Takashi ; Shiraishi Hidetaka
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 地中熱利用システム / 地下温度 / 地下水流動

Outline of Final Research Achievements

As a method of investigating the change of the subsurface thermal environment, there is a method of installing a high precise thermometer inside a subsidence observation well. There have been a number of studies that use this method to reveal subsurface warming using the method. Therefore, using the same method, We have conducted As a result, we found that the effect of the geothermal heat exchanger system is in the range of several meters from the heat exchange well after about 120 days of cooling operation. Generally, it is difficult to detect subsurface subsidence observation wells because they are located several kilometers away from the heat exchange wells. In this study, we proposed that thermal monitoring in the geothermal heat exchanger system is effective.

Free Research Field

地球科学

Academic Significance and Societal Importance of the Research Achievements

地中熱システムを将来的に普及させるうえで地下熱環境の変化を予測し、環境負荷を最小限に抑えた持続的な運用が可能な設置方法（設置密度等）や監視方法を明らかにしたうえで、計画的に導入を進めることが必要である。特に国内最大の都市域を形成する関東平野では、多数導入されることが予想されており、その影響評価を行うことが喫緊の課題である。その観点から本科研の成果は将来の監視手法まで議論し社会的な意義も大きいと考えている。