研究等業績 - 原著論文 - 藤井 光
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Dacquay C., Fujii, H., Lohrenz, E., Holländer, H. M.
Journal of Building Engineering ( Journal of Building Engineering ) 40 2021年08月
研究論文（学術雑誌）
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Dacquay C., Fujii, H., Lohrenz, E.
International Journal of Green Energy ( International Journal of Green Energy ) 40 ( 9 ) 977 - 985 2021年08月 [査読有り]
研究論文（学術雑誌） 国際共著
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地中熱利用による地下微生物への影響評価
谷口聡子・藤井 光・高橋 唯・渡部敦史
日本地熱学会誌 43 ( 3 ) 99 - 109 2021年07月 [査読有り]
研究論文（学術雑誌） 国内共著
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非開削工法にて埋設した単管式水平型地中熱交換器のフィールド試験および数値シミュレーション
津谷駿介・藤井 光・小助川洋幸・サイード モハマドザデ ビナ・原田 烈
日本地熱学会誌 43 ( 1 ) 7 - 17 2021年01月 [査読有り]
研究論文（学術雑誌） 国内共著
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Evaluation of Ground Source Heat Pump System's Enhancement by Extracting Groundwater and Making Artificial Groundwater Velocity
Mohammadzadeh Bina, S., Fujii, H., Kosukegawa, Farab-Asl, H.
Energy Conversion and Management 2021年01月 [査読有り]
研究論文（学術雑誌） 国内共著
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1 ｍ深地温観測による地球温暖化・ヒートアイランド現象の実証的理解
江原幸雄・藤井 光・津谷駿介・野田徹郎・松林修・松本光央・笹田政克・神谷章夫・福岡晃一郎・濱元栄起・西塔幸由
日本地熱学会誌 ( 日本地熱学会 ) 43 ( 1 ) 19 - 30 2021年01月
研究論文（学術雑誌）
<p>Measurements of ground temperature at a depth of 1 meter have been performed since 2012 in several prefectures at eastern Japan region in order to study changes in the thermal environment of the earth's surface. We detected that ground temperature measurements at different stations show similar seasonal variation. As a result, we found that recent changes in the ground temperature at a depth of 1 meter are not monotonous (not uniform rise or uniform decline), but fluctuate at intervals of several years. We intend to continue ground temperature measurements at a depth of 1 meter in order to relate the change in the thermal environment of the earth's surface layer due to global warming or the heat island phenomenon to the changes at a depth of 1 meter.</p>
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Investigation of heat pump performance in heterogeneous ground
Boban, L., Soldo, V., Fujii, H.
Energy Conversion and Management 2020年10月 [査読有り]
研究論文（学術雑誌） 国際共著
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Evaluation of Suitable Areas to Introduce a Closed-Loop Ground Source Heat Pump System in the Case of a Standard Japanese Detached Residence
Shrestha, G., Yoshioka, M., Fujii, H., Uchida, Y.
Energies 13 2020年08月 [査読有り]
研究論文（学術雑誌） 国内共著
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Evaluation of an integrated sewage pipe with ground heat exchanger for long-term efficiency estimation
Dacquay, C., Holländer, H., Kavgic, M., Maghoul, P., Liu, H., Fujii, H.
Geothermics 86 2020年07月 [査読有り]
研究論文（学術雑誌） 国際共著
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津谷 駿介, 藤井 光, 小助川 洋幸, ビナ サイード モハマドザデ, 原田 烈
日本地熱学会誌 ( 日本地熱学会 ) 42 ( 3 ) 67 - 77 2020年07月 [査読有り]
研究論文（学術雑誌） 国内共著
<p>The Horizontal Directional Drilling (HDD) method is one of the most effective measures in reducing the installation cost of Horizontal Ground Heat Exchangers (HGHEs) in Ground Source Heat Pump (GSHP) systems. However, the performance of HGHEs using HDD method has not been studied well due to the lack of field application. In this study, we conducted Thermal Response Tests (TRTs) in a field test site located in Saga city, western Japan. A numerical model was then developed in FEFLOW software to simulate heating/cooling operations using the HGHE and to predict the behavior of the heat medium temperature of the GHE. Firstly, a polyethylene pipe of 50A (ID/OD:52mm/60mm) and U-tube pipe of 25A (ID/OD:27mm/34mm) were installed at the depth of 8m and 6m, respectively, using the HDD method. TRTs were carried out using these GHEs. According to the TRT results, the polyethylene pipe showed the lower temperature increase per unit heat exchange rate compared to the U-tube pipe. This result was considered to be attributed to the large surface area of GHE and also the absence of thermal interference between pipes which happens when using U-tubes. Next, the cooing/heating operations were simulated after the numerical model was developed and validated using TRT results. Furthermore, case studies were carried out for different installation depth of GHE. The simulation showed that the heat medium temperature of the GHE installed at a depth of 5m was lower and higher in the cooling and heating, respectively comparing to the GHE installed at a depth of 10-15m. This is because that the change of ground temperature of -5m has the phase difference of about 150 days, providing the good heat source/sink to the GHE.</p>
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Slinky-coil式水平型地中熱交換器における地表面被覆と熱交換能力の関係について
津谷駿介・藤井 光・小助川洋幸
日本地熱学会誌 42 ( 1 ) 2020年01月 [査読有り]
研究論文（学術雑誌） 国内共著
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Evaluation of utilizing horizontal directional drilling technology for ground source heat pumps
Mohammadzadeh Bina, S., Fujii, H., Tsuya, S., Kosukegawa, H., Naganawa, S., Harada, R.
Geothermics 85 2020年01月 [査読有り]
研究論文（学術雑誌） 国内共著
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A comprehensive approach for wind power plant potential assessment, application to northwestern Iran
Mohammadzadeh Bina S.
Energy ( Energy ) 164 344 - 358 2018年12月
研究論文（学術雑誌）
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日本国内における帯水層蓄熱普及に向けた社会システム調査
桂木聖彦・藤井 光・黒沼 覚・井上 純・山谷 睦・沼澤喜一
日本地熱学会誌 40 ( 3 ) 193 - 206 2018年07月 [査読有り]
研究論文（学術雑誌） 国内共著
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Classification of Geothermal Resources in Indonesia by Applying Exergy Concept
Mohammadzadeh Bina, S., Jalilinasrabady, S., Fujii, H.
Renewable & Sustainable Energy Reviews 93 499 - 506 2018年05月 [査読有り]
研究論文（学術雑誌） 国内共著
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Exergoeconomic analysis and optimization of single and double flash cycles for Sabalan geothermal power plant
Mohammadzadeh Bina, S., Jalilinasrabady, S., Fujii, H.
Geothermics 72 74 - 82 2018年04月 [査読有り]
研究論文（学術雑誌） 国内共著
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数値シミュレーションによる帯水層蓄熱冷暖房システムの地下環境への影響抑制に関する検討
桂木聖彦・藤井 光・井上 純・山谷 睦・黒沼 覚
日本地熱学会誌 40 ( 2 ) 97 - 108 2018年04月 [査読有り]
研究論文（学術雑誌） 国内共著
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Farabi-Asl H.，Fujii, H., Kosukegawa, H.
Geothermics ( Geothermics ) 71 34 - 45 2018年01月
研究論文（学術雑誌） 国内共著
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Semi-open Loop Ground Source Heat Pump System: Heating Tests, Numerical Modeling and Sensitivity Analysis
Farabi Asl, H., Fujii, H., Kosukegawa, H.
Geothermics 2017年12月 [査読有り]
研究論文（学術雑誌） 国内共著
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Mohammadzadeh Bina, S., Jalilinasrabady, S., Fujii, H.
Geothermics ( Geothermics ) 70 181 - 191 2017年11月 [査読有り]
研究論文（学術雑誌） 国内共著