| Title |
Verification of the Boundary Conditions Used for Generating g-functions and Development of a TRNSYS Simulation Model Using g-functions |
| DOI |
http://dx.doi.org/10.6110/KJACR.2014.26.9.416 |
| Keywords |
g-function ; 경계 조건 차이 ; 덕트 스토리지 모델 ; 트랜시스 시뮬레이션 모델 g-function ; Differences in boundaries ; DST ; TRNSYS simulation model |
| 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. |