| Title |
Performance and Feasibility Analysis on the Unit-Type Ground Heat Exchanger under a Building |
| Authors |
Jae Min Kim, Sangmu Bae, Yu Jin Nam |
| DOI |
http://dx.doi.org/10.6110/KJACR.2018.30.5.228 |
| Keywords |
지열 히트펌프 ; 지중열교환기 ; 성능검토 ; 도입 타당성 분석 ; 유닛형 지중열교환기 Ground source heat pump ; Ground heat exchanger ; Performance analysis ; Feasibility analysis ; Unit-type ground heat exchanger |
| Abstract |
Ground source heat pump (GSHP) systems using annually stable underground temperature have higher coefficient of performance than conventional air-source systems. However, it is difficult to install GSHP system in small-scale building because the initial cost including boring and heat exchanger is relatively expensive compared to other construction cost. To reduce installation cost of GSHP system, a low-depth unit-type ground heat exchanger (GHX) was developed for small-scale building. In this study, numerical simulation of low-depth unit-type GHX was conducted according to arrangement type and installation depth. As a result, heat exchange rates of parallel type (Case 1-1) and serial type (Case 1-4) were 12.27 W/m and 9.10 W/m, respectively. Based on simulation results, payback period of GSHP system was compared to that of conventional air-source system. Vertical closed-loop type recouped the initial installation cost in 14 years while low-depth unit-type did it in 9 years. Results of feasibility analysis indicated that low-depth unit-type GHX could reduce the initial installation cost of the GSHP system. Thus, it could be sufficiently economical for small-scale buildings. |