Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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An Economic Analysis of a Secondary Waste Heat Recovery Geothermal Heating System

2단 가열식 지열시스템의 경제성 분석

  • Shin, Jeong Soo (General Graduate School, Seoul National University of Science & Technology) ;
  • Kim, Sean Hay (School of Architecture, Seoul National University of Science & Technology)
  • 신정수 (서울과학기술대학교 일반대학원) ;
  • 김선혜 (서울과학기술대학교 공과대학 건축학부)
  • Received : 2016.10.31
  • Accepted : 2017.03.23
  • Published : 2017.05.10
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Abstract

This paper provides an economic analysis of a new geothermal heat pump system that reuses condenser waste heat from a Ground Source Heat Pump ($GSHP_{ch}$) to provide energy for a hot water Ground Source heat pump ($GSHP_{hw}$). After conducting feasibility tests using GLD and TRNSYS simulations, the proposed system was effectively installed and thoroughly tested. We observe that 1) the Coefficient of Performance (COP) of the $GSHP_{hw}$ and the $GSHP_{ch}$ during cooling mode improves by up to 62% and 7%, respectively; 2) the number of bore holes can be reduced by two; and 3) the hot water supply temperature of the $GSHP_{hw}$ increases by up to $60^{\circ}C$. We further conclude that 1) the reduction of two bore holes can save approximately ten million Won from the initial cost investment; and 2) the increased COP of the $GSHP_{hw}$ can save approximately one million Won in annual electricity costs.

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References

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