| Title |
Development of an Electric Circuit Transient Analogy Model in a Vertical Closed Loop Ground Heat Exchanger |
| Authors |
김원욱(Wonuk Kim) ; 박홍희(Honghee Park) ; 김용찬(Yongchan Kim) |
| DOI |
http://dx.doi.org/10.6110/KJACR.2012.24.4.306 |
| Keywords |
상사 ; 전기회로 ; 지중열교환기 ; 열응답 ; 과도해석 ; 수직 밀폐형 Analogy ; Electric circuit ; Ground heat exchanger ; Thermal response ; Transient analysis ; Vertical closed loop ; |
| Abstract |
Several numerical or analytical models have been proposed to analyze the thermal response of vertical ground heat exchangers (GHEX). However, most models are valid only after several hours of operation since they neglect the heat capacity of the borehole. Recently, the short time response of the GHEX became important in system simulation to improve efficiency. In this paper, a simple new method to evaluate the short time response of the GHEX by using an analogy model of electric circuit transient analysis was presented. The new transient heat exchanger model adopting the concept of thermal capacitance of the borehole as well as the steady-state thermal resistance showed the transient thermal resistance of the borehole. The model was validated by in-situ thermal response test and then compared with the DST model of the TRNSYS program. |