| Title |
Development of an FLS-based Ground Heat Exchanger Model for Simulating Group Operation of An Irregularly placed Exchanger |
| Authors |
Young-Joon Park ; Seong-Hoon Park ; Eui-Jong Kim |
| DOI |
https://doi.org/10.6110/KJACR.2024.36.4.185 |
| Keywords |
지중열교환기; 부하 불균형; 시뮬레이션; 열간섭 Ground Heat Exchanger; Load imbalance; Simulation; Thermal interference |
| Abstract |
A geothermal heat pump system is a renewable energy system that utilizes the ground as a heat source to meet heating and cooling demands of buildings. Thermal efficiency of a commonly used vertical closed-loop system is affected by thermal interference and load imbalance significantly, necessitating appropriate design of ground heat exchangers and implementation of various optimal control methods. However, the widely used ground heat exchanger model, the DST (Duct-Storage) model, has limitations as it cannot simulate irregular arrangements or individual control strategies among ground heat exchangers. On the other hand, the FLS (Finite Line Source) model can overcome such limitations of the DST model. In this study, we developed an FLS model to estimate the expected Entering Water Temperature (EWT) under specific conditions and validated it by comparing it with the DST model for typical cases. Results demonstrated that the proposed FLS model had similar thermal responses to the DST model, showing only negligible deviations. Furthermore, by utilizing the proposed FLS model, various operating cases can be simulated, e.g., irregular arrangements and separate controls, confirming its ability to overcome limitations of the DST model. |