초록 ▼

수변지역에 지하수열을 활용한 지열 냉난방시스템을 설치하여 시설 운영가동과 현장 시연회 개최 그리고 시스템의 운영자료에서 친환경 에너지 절감에 관한 자료 분석을 실시하였다. 연구개발 성과를 공공에 환원하기 위하여 설계 매뉴얼, 환경관리 매뉴얼, 지중설비 매뉴얼을 작성하였다.

시스템 운영과 함께 환경모니터링을 실시하여 지하수 환경 및 지중 미생물 군집 변화를 상세히 파악하기 위하여 정기적으로 수질 시료 채취 및 분석을 실시하였다.

수변 충적층 지역을 선택하여 100지점 이상 열용량을 측정하고 분포도를 작성하였다

수변지역에 지하수열을 활용한 지열 냉난방시스템을 설치하여 시설 운영가동과 현장 시연회 개최 그리고 시스템의 운영자료에서 친환경 에너지 절감에 관한 자료 분석을 실시하였다. 연구개발 성과를 공공에 환원하기 위하여 설계 매뉴얼, 환경관리 매뉴얼, 지중설비 매뉴얼을 작성하였다.

시스템 운영과 함께 환경모니터링을 실시하여 지하수 환경 및 지중 미생물 군집 변화를 상세히 파악하기 위하여 정기적으로 수질 시료 채취 및 분석을 실시하였다.

수변 충적층 지역을 선택하여 100지점 이상 열용량을 측정하고 분포도를 작성하였다. 이러한 일련의 작업들이 체계적으로 진행되어 현재 지하수 열원의 냉난방 시스템 가동이 원활하게 진행되고 있고 에너지 사용 절감 자료도 확보되어서 모든 연구팀들이 맡은 연구 업무를 충실하게 수행했다고 평가된다.

(출처 : 보고서 요약서 4p)

Abstract ▼

Purpose&Contents
○ The main objectives of this study are to develop an air-conditioning and heating system using a large volume of groundwater heat source stored in the alluvial aquifer around the riverside area and to enhance and optimize the extraction and utilization efficiency of groundwater

Purpose&Contents
○ The main objectives of this study are to develop an air-conditioning and heating system using a large volume of groundwater heat source stored in the alluvial aquifer around the riverside area and to enhance and optimize the extraction and utilization efficiency of groundwater as a heat source by monitoring the hydrogeological characteristic data and the influent and effluent temperatures through an underground facility system.

○ Moreover, the guide and standards for the design and operation of the air-conditioning and heating system, using the groundwater heat source stored within the alluvial aquifer, would be established by complementing deficiencies through direct operation, and hence, the foundation of commercialization and dissemination can be prepared for the future.

○ Therefore, this study aims to promote effectiveness, comparing to the existing underground facilities, for the steady operation of the air-conditioning and heating system based on the investigation‧analysis‧evaluation data, with assessment of underground facilities and operation systems, in order to maintain thermal efficiency and secure economic feasibility.

○ Furthermore, this study also aims to: 1) analyze the current performance status of the heat pump related to the above - ground core components for using the riverside area underground heat source; 2) secure the basic technique of heat pump optimization design to cope with various loads and to produce high temperature water; and 3) develop an evaluation technique for reducing greenhouse gas.

Results
○ We intended to assess the impact of aquifer characteristics on the open loop system design by performing sensitivity analysis with consideration of groundwater velocity and recharge and discharge volume. In order to determine the characteristics of groundwater at the site, which is important for the efficient operation of an open loop geothermal system, we analyzed the influence between groundwater and the river around the site and developed an optimization algorithm to improve the operational efficiency.

○ Multivariate statistical analysis and next generation sequencing technique were applied to analyze the in-situ water quality and investigate the colonial structures of microorganisms, and the environmental impact elements and the scope of open loop geothermal system were identified by periodic monitoring of water quality, microbes, water temperature and water level since the operation of the heat pump and were reflected in the environmental maintenance and management guideline.

○ The underground facility and monitoring system were installed for “the riverside area alluvial aquifer groundwater heat source utilization and storage system” at the site of the Han River Environment Research Center in Yangsu-ri, Yangseo-myeon, Yangqyeong-gun.

The underground header was installed and connected to the ground devices, and the pilot test was performed for the installation of the underground facility. An electric valve was set up in the underground header for automatic control. We performed the monitoring by installing the real-time water level and temperature measuring devices in the injection, discharge and monitoring wells and connected them to the control system to faciliate remote control. Foreign cases were studied and referenced to prepare the design and construction guideline.

○ During this project, 25RT and 45RT geothermal heat pumps, which passed standard and certification criteria, KS B 8292, were developed. These products are high temperature water pumps that can discharge water of over 60oC, higher than the temperature at which legionella can survive; therefore the pumps are effective in killing legionella. The efficiency of these pumps is 10.92% higher than that of the competitor’s among the products which are registered in Korea Energy Agency.

○ During the project, we measured thermal and hydraulic properties in alluvial aquifer around the riverside area, created a web-based geothermal database system using measured data and opened this information to the public, developed a thermal storage capacity calculation method for the alluvial area using numerical modeling, and allowed the use of this method for the best location analysis of thermal development. Moreover, thermal properties were analyzed by determining the correlation between soil moisture content and thermal conductivity through an indoor experiment using a sandbox.

○ We established the guideline of alternative refrigerant application and heat pump technology development by analyzing the current performance of Korean-certified heat pump, and secured the ability to supply air-conditioning and heating and hot-water simultaneously to meet the loads of various buildings, and secured the basic technology for the optimized design of a high temperature water production heat pump. Furthermore, we developed the evaluation techniques for annual energy consumption and greenhouse gas emission rate in the geothermal source heat pump system.

Expected Contribution
○ In this study, we will verify the applicability of groundwater heat source utilization system using open loop underground heat exchanger in alluvial aquifer around the riverside area as a new environment friendly-high efficiency energy source by establishing an in-situ pilot system for the first time in Korea, and formulate a highly reliable diagnosis and prediction model through the accumulation of long-term monitoring data. According to this effort, design and operation standards for the installation of open loop underground heat exchangers in alluvial aquifer around the riverside area can be established, and the perception of an open loop underground heat source application system in alluvial aquifer around the riverside area, which has never been used in Korea, can be changed to contribute to the better use of an environment friendly energy source that has infinite possibility.

○ The groundwater heat source system design data and underground heat capacity calculation data obtained in the study, which are the only actual data available in Korea, can be provided to the companies doing business in the alluvial aquifer around the riverside area and natural geothermal energy, which need system design and construction standards. Moreover, the technologies and study results developed during the study can be exported to developing countries in various forms. Not only the technologies but also the trained research personnel can be exported to the developing countries, e.g. Southeast Asia and Mongolia, whose markets of the related industry are increasing rapidly, to contribute to national wealth.

○ The various criterion data, such as period and method of operation of the groundwater heat source system, can be provided publicly to the companies and organizations who need information, and it can be institutionalized. In addition, the programs that predict and monitor the efficiency of groundwater heat source system for various regions can be developed and commercialized.

○ When installing open loop underground heat exchangers, the environment of the underground aquifer would be changed due to the utilization of groundwater heat source.

An environmental impact assessment criteria should be prepared in order to minimize the impact from such installation for active commercialization of the heat exchangers; therefore it is essential to perform pilot tests. The long-term operational data, obtained and accumulated by using various methods during this study, of the open loop underground heat exchangers in alluvial aquifer around the riverside area might be a valuable data in the preparation of the environmental impact assessment criteria, and hence it may ensure the stability of groundwater heat source utilization system in Korea and contribute for the effective distribution in the future.

○ Moreover, after implementing the Four Major Rivers Restoration Project in Korea, a policy for increased management of riverside areas has been pursued by enacting the Special Law on the Waterfront-Space Use for the effective and systematic utilization and management of riverside areas. The Special Law on the Waterfront-Space Use contains the legislation for developing the part of the area within 2 km from the river systematically to maximize the connectivity to the rivers and utilization of renewable energy as a basic guideline; therefore, the necessity and effectiveness of a large volume of groundwater heat source becomes influential and thus the results of this study can be utilized.

○ The analytical data on the geothermal heat source heat pump unit certification status and the performance depending on the operational variables obtained during this study can be applied as a basic data for developing the geothermal heat source heat pump unit. The comparative analysis data on the performance of each heat pump unit according the flowrate of the underground circulating water can be applied as data for ground technology for the design optimization and efficiency enhancement of the riverside area groundwater heat source utilization system. In addition, this technology can be employed as a design technique for enhancing the efficiency of the existing closed loop system. The foreign and domestic standards data, related to the evaluation of heat pump performance, can be introduced as basic data for developing heat pump units. Moreover, it can be used as ground technology for the performance and reliability assessment of the heat pump system, which utilizes the riverside area geothermal heat source and other geothermal heat source and unused energy, through the improvement of the current geothermal heat source heat pump unit certification system.

○ The geothermal heat pump developed in this project is a high efficiency-high water temperature product, which introduces vapor injection, and if we actively sell the product through the procurement registration and promote the continuous specification sales (high efficiency and high water temperature) to government offices and design firms, it is expected to contribute to the vitalization of the new market.

○ The database of the thermal property of alluvial aquifer established in this study will be used as an important basic data for the development and utilization of geothermal heat source. In addition, the objectives of this study, which are the calculation of geothermal storage capacity of the alluvial aquifer around the riverside area and the analysis of the best location for the geothermal development, will be an important basic data to propose ultimately the geothermal heat source utilization method.

○ These data can be applied to improve the efficiency and to modernize the ground technology of the geothermal heat source heat pump.

(출처 : SUMMARY 7p)

목차 Contents

• 표지 ... 1
• 제출문 ... 2
• 보고서 요약서 ... 4
• SUMMARY ... 7
• 목차 ... 10
• Table of Contents ... 11
• 제 1장 연구개발과제의 개요 ... 12
• 제 1절 연구개발 목적 ... 12
• 제 2절 연구개발의 필요성 ... 13
• 제 3절 연구개발 범위 ... 17
• 제 2장 국내외 기술개발 현황 ... 22
• 제 1절 국내 기술 개발 현황 ... 22
• 제 2절 국외 기술 개발 현황 ... 36
• 제 3장 연구수행 내용 및 결과 ... 82
• 제 1절 수변지역 지하수열 추출 최적화 및 지열영향 저감 사후관리 기술 ... 82
• 제 2절 수변 충적층 지하수열 활용 저장 시스템 개발 ... 204
• 제 3절 지상설비(지열히트펌프) 제작 및 활용 ... 322
• 제 4절 연구지역 충적층의 열물성, 수리적 물성 측정 ... 429
• 제 5절 수변지역 지하수열 활용 저장 핵심기기 설계 및 성능 평가기반 기술 개발 ... 508
• 제 4장 목표달성도 및 관련분야 기여도 ... 566
• 제 1절 수변지역 지하수열 추출 최적화 및 지열영향 저감 사후관리 기술 ... 566
• 제 2절 수변 충적층 지하수열 활용 저장 시스템 개발 ... 567
• 제 3절 수변 충적층 지하수열 활용 저장 시스템 지상설비 최적화 기술 개발 ... 568
• 제 4절 수변 충적층 지하수열 활용 저장 시스템 최적지 분석 기술 ... 569
• 제 5절 수변지역 지하수열 활용 지상 핵심기기 설계 및 성능 평가기반 기술 개발 ... 569
• 제 5장 연구결과의 활용계획 ... 570
• 제 6장 연구과정에서 수집한 해외과학기술정보 ... 572
• 제 7장 연구결과의 활용계획 ... 580
• 제 8장 연구결과의 활용계획 ... 581
• 제 9장 연구개발과제의 대표적 연구실적 ... 582
• 제 10장 참고문헌 ... 583
• 끝페이지 ... 598