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成果報告書詳細
管理番号20170000000238
タイトル*平成28年度中間年報 再生可能エネルギー熱利用技術開発 再生可能エネルギー熱利用のポテンシャル評価技術の開発 地圏流体モデリング技術による国土地中熱ポテンシャルデータベースの研究開発
公開日2017/8/30
報告書年度2016 - 2016
委託先名応用地質株式会社 株式会社地圏環境テクノロジー
プロジェクト番号P14017
部署名新エネルギー部
和文要約
英文要約Title: Renewable energy heat utilization technology development / Development of potential evaluation technology for the renewable energy heat utilization / Research and development of national geothermal heat potential database using geosphere fluid modeling technology (FY2014-FY2018) FY2016 Annual Report

OYO Corp.
Geosphere Environmental Technology Corp.

The purpose of this study is to develop a ground source heat pump (GSHP) potential map as a tool to support GSHP system design which takes into consideration the advection effects of groundwater flow for site selection. The study includes the following work packages: i) Research on geothermal heat utilization records and database compilation, ii) Construction of the 3D geological structured model, iii) Development of the multi-scaled integrated watershed models for national water and thermal circulation, iv) Technology development for evaluating GSHP potential and integrated informative system, and v) Validation of GSHP potential map.

i) Research on geothermal heat utilization records and database compilation
The geothermal heat utilization records were investigated as base information of the GSHP potential map development for target regions. In addition, groundwater level and depth profiles of temperature were measured using existing observation wells where have only few validation data. Those collected information has been compiled into a database for validating the GSHP potential map.

ii) Construction of the 3D geological structured model
3D geological feature structured models of Kanto region, Miyagi region, and Nagano region were developed. The horizontal resolution of the models is about 50-250m, and the vertical resolution (depth direction) is 1m. Borehole data was basically used to construct the numerical models of the target regions and geological maps and cross sections were additionally used.

iii) Development of multi-scale Japanese archipelago hydrothermal models
Integrated models with deep geological information were constructed by combining the models with shallow geology referencing with the Japanese archipelago hydrothermal model with 500m meshing developed in the fiscal year 2014.
The integrated models were used to simulate the hydrothermal conditions of the target areas respectively. In addition, the borehole models for respective areas which simulate the thermal exchange between the circulating liquid in tube and the subsurface water/rock outside of tube were constructed.

iv) Technology development for evaluating GSHP potential and integrated informative system
The GSHP potential evaluation method was developed and applied tentatively to actual potential mapping for Kanto region, Miyagi region, and Nagano region.
To estimate GSHP potential of a certain point, a surrogate function, which correlates the calculated subsurface heat flux with the calculated recoverable heat obtained from the assumed heat pump operation, was developed. Using the surrogate function, the GSHP potential was derived and graphical maps were created over the target areas.

v) Validation of GSHP potential map
The GSHP potential map derived from the surrogate function was validated through comparison with the actual operation data of GSHP system. The developed map showed nearly the same values as the actual data, so that we prospect that our method could supply more reliable estimation than the conventional method such as NNI(Natural Neighbor Interpolation).
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