2021 Fiscal Year Final Research Report
Investigation of actual condition of temperature distribution in aquifer and thermal interference between heat storage wells during aquifer heat storage operation
| Project/Area Number |
19H02300
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 23020:Architectural environment and building equipment-related
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| Research Institution | Osaka City University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 帯水層蓄熱 / 冷暖房 / 省エネルギー / 低炭素 / 温度分布 / 地中熱利用 |
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| Outline of Final Research Achievements |
The observation wells were constructed at a distance of 27m (observation well 1) and 40m (observation well 2) from the actual reservoir, and the water temperature has been measured. Two observation wells were constructed near a heat source well to store cold water in winter. Over the three years from the winter of 2019 to the winter of 2021, the spread of cold water masses around the heat source wells was observed and recorded as changes in water temperature. By comparing the calculated water temperature by the three-dimensional heat flow simulation with the measured water temperature in the observation well, we searched for the heat flow parameters when they match, and identified the aquifer thickness, groundwater flow velocity, and heat dispersion length. In addition, the water temperature distribution around the heat source well was estimated by numerical calculation.
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| Free Research Field |
都市の熱環境・エネルギー有効利用
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| Academic Significance and Societal Importance of the Research Achievements |
観測井の温度観測値を用いることで熱源井戸における揚水温度を用いた同定では評価することのできなかった帯水層厚さや地下水流速についての評価が可能であることを明らかとした。また同定結果をもとに、観測井戸の以外の地点の水温分布について内挿・外挿により求めた。以上の成果は、先行研究では不明であった帯水層内部の蓄熱水塊の広がり状況を実測に基づく推定値を示した新規の知見であり、帯水層蓄熱において熱干渉を考慮した井戸配置を設計する際の有用な基礎資料となろう。
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