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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Verification of the Boundary Conditions Used for Generating g-functions and Development of a TRNSYS Simulation Model Using g-functions

트랜시스를 이용한 지열 응답 함수 경계 조건 검증 및 시뮬레이션 모델 개발에 관한 연구

  • Kim, Eui-Jong (Center for Energy and Thermal Sciences of Lyon, INSA de Lyon)
  • 김의종 (프랑스 리옹 국립 응용 과학원(INSA de Lyon) 에너지-열 공학 센터)
  • Received : 2014.06.10
  • Accepted : 2014.07.06
  • Published : 2014.09.10
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Abstract

To verify different boundary conditions on the borehole wall, which are commonly used for generating g-function, the well-known TRNSYS simulation model, DST (Duct STorage), is employed. By letting the fluid circulation determine the borehole wall conditions, a DST-based g-function is induced with numerical processes proposed in this work. A new TRNSYS module is also developed to accommodate g-function data and predict dynamic outlet fluid temperatures. Results showed that the modified g-function, which is different from Eskilson's original g-function, is closer to the DST-based g-function. This implies that the uniform heat transfer rates over the height can be used for good approximation. In fact, simulations with the modified g-function showed similar results as the DST model, while Eskilson g-function case deviated from the DST model as time progressed.

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References

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