• 디지털산업정보학회논문지
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• 제12권2호
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• pp.1-6
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• 2016

Several efforts to replace the use of existing fossil energy resources have already been made around the world. As a result, a new industry of renewable energy has been created, and efficient energy distribution and storage has been promoted intensively. Among the newly explored renewable energy sources, the most widely used one is solar energy generation, which has a high market potential. An energy storage system (ESS) is a system as required. In this paper, the design and implementation of an ESS for the efficient use of power in stand-alone street lights is presented. In current ESS applied to stand-alone street lights, either 12V~24V DC (from solar power) or 110V~220V AC (from commercial power) is used to recharge power in systems with lithium batteries. In this study, an ESS that can support both solar power and commercial power was designed and implemented; it can also perform emergency recharge of portable devices from solar powered street lights. This system can maximize the scalability of ESSes using lithium batteries with efficient energy conversion, with the advantage of being an eco-friendly technology. In a ripple effect, it can also be applied to smart grids, electric vehicles, and new, renewable storage markets where energy storage technology is required.

• Korean Chemical Engineering Research
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• 제43권1호
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• pp.39-46
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• 2005

에너지 절약형 증류시스템인 열복합 증류탑의 에너지 사용량은 적으나 운전이 어렵기 때문에 실제공정에 활용이 잘되지 않고 있어 에너지 사용은 적으면서 운전성이 개선된 3탑 증류 시스템을 제안하여 상업적인 실제공정인 헥산제조공정에 활용할 때의 에너지 절약성능과 실제 활용에서 생겨나는 문제에 대해 조사하였다. 에너지 회수구조를 활용할 경우, HYSYS를 이용한 시뮬레이션의 결과 기존의 2탑 증류 시스템에 비해 18%의 에너지 절감효과가 있음을 알았으며 2탑 증류시스템에 비해 제어루프의 수는 증가되지만 3가지 제품의 조성 조절이 쉽고 각 탑의 운전압력을 쉽게 조절할 수 있는 장점을 갖고 있다.

• 한국지열·수열에너지학회논문집
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• 제17권3호
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• pp.21-29
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• 2021

In this study, the current regulation of the water source energy, one of the renewable energy, was analyzed, and the improvement plan for the high efficient data center cooling system was suggested. In the improvement plan, the design and construction guidelines of the water source energy system permit to adopt the cooling and heating system with or without heat pump. In addition, it should also include the system operated in the cooling mode only all year-round. The domestic test standards to consider the water source operating conditions should be developed. Especially, it is highly recommended that the test standards to include the system with forced cooling and free cooling modes related with the enhanced data center cooling system adopting the water source energy.

• 조명전기설비학회논문지
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• 제27권2호
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• pp.14-21
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• 2013

Today, energy problem has become an important issue, and a development of renewable energy is urgent. In architectural fields, a research of the energy efficient lighting system using renewable energy is in progress. The energy efficient lighting system could be realized by integrating a daylight responsive LED lighting control system and a blind PV system. This system is able to save and generate electric energy. Efficiency of this system depends on control methods of blind PV. As a preliminary research, this research analyzed power generation and inflow of available daylight according to control method of blind PV.

• Journal of Power Electronics
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• 제19권1호
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• pp.316-331
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• 2019

A practical application of a supercapacitor energy storage system in a polarization instrument is proposed on the basis of the energy storage requirements of an induced polarization (IP) transmitter for geophysical exploration. We focused on the energy storage system of a supercapacitor, the topology of the power converter, and the system control strategy as key technologies, and we performed theoretical research and experimental tests on the system and developed an experimental platform. The experiments validated the theoretical research on the key technologies of the supercapacitor energy storage system and demonstrated the effectiveness of the innovation. Results showed that the storage system is efficient and satisfies the energy storage needs of the IP transmitter.

• 기계저널
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• 제18권3호
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• pp.33-45
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• 1978

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2008년도 추계학술발표대회 논문집
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• pp.141-146
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• 2008

For the efficient use of thermal energy and its related equipments, optimal energy in view of quality and quantity should be timely provided. The core of thermal energy storage technology deals with an energy efficiency for effective energy storage and supply. The relative importance of thermal energy storage technology has been underestimated so far, and the specific projects on this filed have been performed intermittently. For the efficient and systematic approach of the energy supply system projects on thermal energy storage technology, we conduct the survey on the current status of this field. Firstly, classify into the thermal energy storage and describing the recent research for each system. The necessity and importance of thermal energy storage technology is identified through this study. It reveals that the thermal energy storage is the mandatory technology to solve the difference of supply and demand in thermal loads. It would greatly contribute to the combined heat and power(CHP) system. The urgent technologies for the commercial value and the core technologies for the CHP system are classified with this study.

• 한국정보통신학회논문지
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• 제14권11호
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• pp.2569-2574
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• 2010

본 논문에서는 여러 개의 센서 응용프로그래밍이 함께 동작하는 공유형 태양 에너지 기반 센서 노드에서, 수집되는 태양 에너지의 효율적 활용을 위한 가상 에너지 시스템 기법을 소개한다. 가상 에너지 시스템은 한 센서 노드에서 동시에 수행되는 여러 응용들이 각각 자신이 사용할 에너지를 전체 시스템으로부터 분리하고 예약하여, 어느 정도 예측 가능한 성능을 가대할 수 있게 해주는, 에너지 시스템 추상화 계층이다. 실험 결과는 가상 에너지 시스템이 효율적이고 안정적으로 동작하여, 한 센서 노드에서 여러 응용이 조화롭게 실행됨을 보여 주고 있다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.1159-1165
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• 2010

This paper describes an energy efficient train control. In these days, the researchers develop the energy efficient railway technologies, such as energy storage system, energy efficient driving. Mass rapid transit (MRT) railways, which are an important means of public transportation in urban areas, have operational characteristics that include short headways, frequent departures and arrivals. Therefore, when multiple trains are operating in the same power supply system, it is important to synchronize the energy tractions and regenerations. This paper define the group of trains for energy saving according to a power supply. We analyze the current synchronized driving situations and estimate the effect.

• 한국공간정보시스템학회 논문지
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• 제12권1호
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• pp.1-9
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• 2010

최근, 무선 센서 네트워크 기술은 유비쿼터스 컴퓨팅 시대의 핵심 기반 기술의 하나로 인식되고 있다. 센서 노드는 제한된 배터리 용량을 가지기 때문에, 장기간 생존하기 위해서 노드들의 동작에 적은 에너지를 소모해야한다. 따라서, 에너지를 효율적으로 사용하는 프로토콜이 필수적이다. 이를 위해 본 논문 에서는 에너지 사용량을 고려하여 에너지 소모가 적은 경로를 설정하는 위치 기반의 에너지 효율적인 라우팅 프로토콜을 제안한다. 아울러 메시지 전송이 원활하지 못한 경우를 처리하는 경로 재설정 알고리즘을 제안한다. 마지막으로 TOSSIM을 이용한 성능평가를 통해, 제안한 프로토콜이 에너지 효율성 측면에서 기존 위치기반 라우팅 프로토콜 보다 우수함을 보인다.