지하공동 열에너지 저장을 위한 축열 매질의 기술 현황 검토
Review on Thermal Storage Media for Cavern Thermal Energy Storage
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초록
에너지의 효과적인 저장과 관리는 에너지 공급과 수요의 시간적･양적 불균형을 해소하고, 에너지 이용효율을 향상시킬 수 있다는 점에서 새로운 에너지원을 개발하는 일만큼 중요하다. 열에너지 저장 시스템은 산업폐열이나 태양열과 같은 열원 기반의 에너지를 저장하는 시스템으로서, 대용량 저장 시설에 암반 지하공동을 활용하는 경우 주변 암반의 낮은 열전달 특성과 높은 화학적 안정성을 통해 보다 효율적인 저장 시스템을 구축할 수 있다는 장점이 있다. 본 연구에서는 열에너지 저장 방식과 저장 매질의 일반적인 특성과 열에너지 저장사례에 대하여 살펴보고, 지하공동을 활용한 열에너지 저장 시스템에 대한 각 저장 매질의 적용성에 대해 개괄적으로 검토하였다.
Abstract
Developing efficient and reliable energy storage system is as important as exploring new energy resources. Energy storage system can balance the periodic and quantitative mismatch between energy supply and energy demand and increase the energy efficiency. Industrial waster heat and renewable energy such as solar energy can be stored by the thermal energy storage (TES) system at high and low temperatures. TES system using underground rock carven is considered as an attractive alternative for large-scale storage, because of low thermal conductivity and chemical safety of surrounding rock mass. In this report, the development of available thermal energy storage methods and the characteristics of storage media were introduced. Based on some successful applications of cavern storage and high-temperature storage reported in the literature, the applicabilities and practicabilities of storage media and technologies for large-scale cavern thermal energy storage (CTES) were reviewed.
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