Evaluation of the Shallow Geothermal Potential for a Ground-Source Heat Exchanger: A Case Study in Obama Plain, Fukui Prefecture, Japan

  • Hideki Hamamoto
  • Yuji Miyashita
  • Daisuke Tahara
Chapter
Part of the Global Environmental Studies book series (GENVST)

Abstract

A ground-source heat exchanger (GHE) is an energy system exploiting shallow geothermal energy that is economical, environmentally friendly, and is rapidly increasing in popularity worldwide. Evaluating the available subsurface heat energy through thermal response tests and/or numerical simulations to design appropriate GHE systems (e.g. deciding the depth and number of boreholes for heat exchange) is important. Geological structures, groundwater properties, and subsurface temperatures are essential input data for such numerical simulations.

In the present study, we demonstrate the application of the GHE potential map, a new method based on the regional geological structure, subsurface temperature, and groundwater flow. Our target area is the Obama Plain in the central part of Japan, which faces the Sea of Japan. Subsurface temperature measurements at four stations in the Obama Plain were used for the present evaluation.The results of the GHE numerical simulations show a linear increase in GHE efficiency of about 35% with a subsurface temperature increase from 15 °C to 20 °C. In addition, GHE efficiency approximately triples when the groundwater flow ranges from 0 to 10 m/year. We estimated the specific heat-extraction for each 100 m × 100 m grid cell. The mapping results indicate a high GHE potential for the central part of the Obama Plain, with a value of more than 100 W/m. The specific heat-extraction ranges from 50 to 110 W/m in most areas of the Obama Plain. This value is sufficient for GHE to cover the potential heat-extraction demand for the Obama Plain. Our evaluation method can be applied to other plains in Japan and around the world.

Keywords

Shallow geothermal energy Renewable energy Ground-source heat exchanger Heat pump Obama plain Groundwater flow Subsurface temperature 

Notes

Acknowledgments

This research was mainly conducted as a part of the integrated research project of “Human-Environmental Security in Asia-Pacific Ring of Fire: Water-Energy-Food Nexus by the Research Institute for Humanity and Nature (RIHN)”. A portion of the analyses in this work was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number JP16K00595 and it was conducted as the research project of the Center for Environmental Science in Saitama. We thank Dr. M. Taniguchi, Dr. A. Endo, and Dr. M. Fujii, who lead the NEXUS project of RIHN, for their invaluable advices for our investigation and further analysis. Dr. S. Hachinohe helped in the investigation of subsurface temperature in the Obama Plain. We thank Ms. T. Okamoto, who provided accounting support. The groundwater simulation information was provided by the Obama City local government and the Nippon Koei Corporation.

References

  1. Blum P, Campillo G, Kölbel T (2011) Techno-economic and spatial analysis of vertical ground source heat pump systems in Germany. Energy 36(5):3002–3011CrossRefGoogle Scholar
  2. Carslaw HS, Jaeger JC (1986) Conduction of heat in solids second edition. Oxford University PressGoogle Scholar
  3. City O (2016) Report of Obama city statistics. Obama City, FukuiGoogle Scholar
  4. Obama City (2017) The Obama Plain Groundwater Survey Summary Report,. http://www1.city.obama.fukui.jp/category/page.asp?Page=2574. Accessed 26 June 2017
  5. DHI-WASY (2010) User Manual. DHI-WASY GmbH, GermanyGoogle Scholar
  6. Domenico PA, Schwartz FW (1997) Physical and chemical hydrogeology, 2nd edn. Wiley, New YorkGoogle Scholar
  7. Hamamoto H, Shiraishi H, Hachinohe S, Ishiyama T, Satake K, Miyakoshi A (2014) Synthesis of subsrface temperature information and evaluation of potential for setting up ground heat exchangers in Saitama prefecture. BUTSURI-TANSA 67(2):107–119. (in Japanese)CrossRefGoogle Scholar
  8. Harbaugh AW (2005) MODFLOW-2005, The U.S. Geological survey modular ground-water model—the ground-water flow process. Techniques and methods, US geological survey 6–A16Google Scholar
  9. Japan Ministry of the Environment (2012) Report of investigation of ground source heat energy use.. http://www.env.go.jp/press/15945.html. Accessed 20 Sept 2017. (in Japanese)
  10. Japan Ministry of the Environment (2016) Report of investigation of ground source heat energy use.. http://www.env.go.jp/press/103827.html. Accessed 20 Sept 2017. (in Japanese)
  11. Japan Sustainable Building Consortium (2016) Data-base for Energy Consumption of Commercial buildings.. http://www.jsbc.or.jp/decc_english/index.html. Accessed 26 June 2017
  12. Lund JW, Boyd TL (2015) Direct utilization of geothermal energy 2015 worldwide review. Paper presented at the world geothermal congress 2015, Melbourne, Australia, 19–25 Apr 2015Google Scholar
  13. Public Corporation of Fukui Construction Technology (2010) Geological map of Fukui prefecture. Public Corporation of Fukui Construction Technology, FukuiGoogle Scholar
  14. Sarbu I, Sebarchievici C (2015) Ground-source heat pumps; fundamentals, experiments and applications. Elsevier, AmsterdamGoogle Scholar
  15. Senate Department for Urban Development and Housing (2015) Geothermal potential: Specific conductivity and specific extraction capacity.. http://www.stadtentwicklung.berlin.de/umwelt/umweltatlas/ei218.htm. Accessed 26 June 2017
  16. Shrestha G, Uchida Y, Yoshioka M, Fujii H, Ioka S (2015) Development of potential maps for ground source heat pump systems with a new approach. J Geotherm Res Soc Japan 37(4):133–141Google Scholar
  17. Stauffer F, Bayer P, Blum P, Giraldo NM, Kinzelbach W (2014) Thermal use of shallow groundwater. CRC Press, Boca RatonGoogle Scholar
  18. Taniguchi M, Masuhara N, Burnett K (2015) Water, energy, and food security in the Asia Pacific region. J Hydrol Reg Stud 11:9–19.  https://doi.org/10.1016/j.ejrh.2015.11.005 CrossRefGoogle Scholar
  19. Turcotte D, Schubert G (2014) Geodynamics, 3rd edn. Cambridge University PressGoogle Scholar
  20. Verein Deutscher Ingenieure (2001) VDI 4640 – blatt 2. Thermal use of the underground ground source heat pump systems. Verein Deutscher Ingegneure, DüsseldorfGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Hideki Hamamoto
    • 1
  • Yuji Miyashita
    • 2
  • Daisuke Tahara
    • 3
  1. 1.Center for Environmental Science in SaitamaSenior ResearcherSaitamaJapan
  2. 2.Hot Springs Research Institute of Kanagawa PrefectureSenior ResearcherKanagawaJapan
  3. 3.Faculty of Marine Bioscience, Fukui Prefectural UniversityAssociate ProfessorFukuiJapan

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