건물 구조체 이용 수평형 지열시스템의 채열량 예측에 관한 연구 = Study on the Prediction of the Heat Exchange Rate for the Horizontal Ground Source Heat Pump System utilizing the Building Structure

다국어 초록 (Multilingual Abstract)

Recently, the reduction of energy consumption in buildings and the use of renewable energy become social issues, and an interest in geothermal systems is increasing. In particular, the building integrated geothermal system using has been ground heat exchanger in terms of economy and efficient use of land. Ground-source (geothermal) heat pump (GSHP) systems can achieve a higher coefficient of performance than conventional air source heat pump (ASHP) systems by utilizing the relatively stable underground temperature. The market for these systems in Korea has grown remarkably over the past few years due to efforts to improve the drilling method and reduce the installation cost of ground heat exchanger (for example, utilizing the building pile and foundation as ground heat exchanger. However, it is difficult to optimally design the system due to the absent of quantitative data such as operator data, performance data, so on. In order to predict the performance of horizontal geothermal system using underground structure, this research has developed the method of prediction on the ground heat exchange rate with three-dimension ground heat transfer model. Furthermore, the measurement of underground temperature in basement was conducted to decide the boundary condition of simulation. The result of measurement was compared with it of calculation by the prediction model for the underground temperature. Furthermore, the revised model will be applied to the prediction model of heat exchange rate for the horizontal BIGS.
In this research, the simulation method for a building integrated geothermal system (BIGS) using a horizontal heat exchanger has been developed to couple with groundwater and heat transfer model, ground heat exchanger model and surface heat transfer model. This paper introduces about the summary of the simulation method and describes about the prediction and measurement of surface temperature for setting boundary conditions.
In this results, the heat exchanger rate of ground heat exchange for BIGS system was found as 27.4 W/㎡. using the developed simulation there was still the difference between the calculation result by the revised model and measurement result , but the verification of the prediction model for surface temperature was improved. More detail analysis for the factors of difference will be conducted through the additional measurement and survey.

목차 (Table of Contents)

• 목 차
• 1. 서 론 1
• 1.1 연구배경 및 목적 1
• 1.2 연구범위 및 방법 4
• 2. 이론적 고찰 7
• 2.1 지열시스템의 개요 7
• 2.1.1 지열시스템 7
• 2.1.2 지열시스템의 종류 9
• 2.1.3 국내·외 연구동향 11
• 2.2 건물일체형 지열시스템의 개요 16
• 2.2.1 건물일체형 지열시스템 16
• 2.2.2 국내·외 연구동향 17
• 2.3 지열시스템의 채열량 예측수법 21
• 3. 지중채열량 예측을 위한 지중온도변화 분석 31
• 3.1 지중온도예측모델 32
• 3.2 모델검증을 위한 현장실측 36
• 3.2.1 현장실측개요 36
• 3.2.2 실측방법 및 실측장비 38
• 3.2.3 실측결과 및 비교검토 45
• 3.3 수정모델의 제안 및 검토 49
• 4. 지중채열량 예측수법 59
• 4.1 예측수법의 개요 59
• 4.1.1 지중 열·지하수이동 모델 59
• 4.1.2 지표면 열 이동 모델 61
• 4.1.3 지중채열량 예측수법 64
• 4.2 예측모델을 이용한 시뮬레이션 66
• 4.2.1 시뮬레이션 개요 65
• 4.2.2 시뮬레이션 결과 68
• 5. 결론 73
• ▣ 참고문헌 75
• ▣ ABSTRACT 83