A Study on Development Potential of Shallow Geothermal Energy as Space Heating and Cooling Sources in Mongolia

몽골의 천부 지열에너지(냉난방 에너지)개발 가능성에 관한 연구

  • Received : 2012.04.20
  • Accepted : 2012.05.30
  • Published : 2012.06.01

Abstract

Time-series variation of groundwater temperature in Mongolia shows that maximum temperature is occured from end of October to the first of February(winter time) and minimum temperature is observed from end of April to the first of May(summer time). Therefore ground temperature is s a good source for space heating in winter and cooling in summer. Groundwater temperatures monitored from 3 alluvial wells in Ulaabaatar at depth between 20 and 24 m are $(4.43{\pm}0.8)^{\circ}C$ with average of $4.21^{\circ}C$ but mean annual ground temperature(MAGT) at the depth of 100 m in Ulaanbaatar was about $3.5{\sim}6.0^{\circ}C$. Bore hole length required to extract 1 RT's heat energy from ground in heating time and to reject 1 RT's heat energy to ground in summer time are estimated about 130 m and 98 m respectively. But in case that thermally enhanced backfill and U tube pipe placement along the wall are used, the length can be reduced about 25%. Due to low MAGT of Ulaabaatar such as $6^{\circ}C$, the required length of GHX in summer cooling time is less than the one of winter heating time. Mongolia has enough available property, therefore the most cost effective option for supplying a heating energy in winter will be horizontal GHX which absorbs solar energy during summer time. It can supply 1 RT's ground heat energy by 570 m long horizontally installed GHX.

Keywords

Acknowledgement

Grant : 신재생에너지 해외 진출 지원사업 중 해외시장 조사 및 프로젝트 발굴사업

Supported by : 에너지관리공단

References

  1. Ochibat. P., etal, 2010, 몽골의 지질과 광물, 연세대학교 출판부 pp.13-30
  2. Purevsuren Dorj, 2001, Design of small geothermal heating systems and power generators for rural consumers in Mongolia, The United Nations University Reports, No.3, pp 50-522.
  3. Ya.Jamvaljav, et al 2011. Mapping of Permafrost in Mongolia and its relationship to the Environment, Extended Abstracts of Second Inter. Symposium on Mountain and Arid Land Permafrost, Mongolian Permafrost Association pp.25-30
  4. Jargaltulga.Ts, Jamvaljav. Ya,Iijima.Yo 2011, The effects of Snow Cover on the Active Layer and the Seasonal Freezing. Extended Abstracts of Second International Symposium on Mountain and Arid Land Permafrost, Mongolian Permafrost Association pp.34-35
  5. Nanjilin Jadambaa, Wolfgang Gremmelmann, and Aribert Kampe, 2003, Hydrogeologic Map of Mongolia, Institute of Geology and Mineral Resources(IGMR), pp 8-45