• ETRI Journal
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• 제33권6호
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• pp.973-976
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• 2011

This letter describes an efficient technique for maximum power point tracking (MPPT) of an energy harvesting device. It is based on controlling the device voltage at the point of maximum power. Using a microcontroller with a power saving technique, the MPPT algorithm maintains the maximum power with low power consumption. An experiment shows that the algorithm maximizes the energy transfer power using an energy management IC fabricated in a 0.18-${\mu}m$ process. Compared to direct energy transfer to a battery, the proposed technique is more efficient for low-energy harvesting under variable conditions.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2005년도 학술대회 논문집
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• pp.409-414
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• 2005

We are interaction refrigeration warehouse cold water pump system and photovoltaic generation system. At this time, a target pressure is able to control in spite of change of the pressure according to pump head and rate of flow of pump. Also, we carry out the vector control of BLDC moor with the maximum torque operation and a high reliability from territory of each operation speed. Therefore, in this paper, we conclude energy saving technique of refrigeration warehouse cold water pump system.

• 한국정보통신학회논문지
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• 제24권7호
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• pp.925-934
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• 2020

본 연구는 선박의 에너지 효율을 향상시키기 위하여 에너지 절감 시스템 (ESS, Energy Saving System)의 알고리즘을 선박운항 특성에 적합하게 설계하고, 특정 시스템을 탑재한 선박의 운항 특성을 바탕으로 에너지 소비 양상을 분석하여 운항 비용을 절감할 수 있도록 하는 기법에 대하여 연구한다. 이를 위해 발전체계를 기반으로 선박의 추진 체계 특성을 반영한 에너지 효율을 높일 수 있는 효율적인 시스템을 구현한다. 연구대상 선박은 LNG 운반선에 탑재된 HVACS(Heating, Ventilation and Air Conditioning) 대상으로 연구를 진행하며, 이를 기반으로 미래형 기반 선박인 전기추진선박 및 자율운항선박 등에 적용할 수 있도록 확장성을 가진 에너지 절감 기법을 제안한다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.969-975
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• 2005

A rail heating system can be classified as the method which uses a natural phenomena change in climate condition and the method which uses electric energy. The former uses a the sunshine and wind for frozen rail or snow. On the other hand, and the latter uses the electric energy. In this paper, to set up an effective thaw system in railway facilities using the electric energy, the component for thaw equipments, the installing method, the method for temperature regulation, and the maintenance technique will be analyzed and compared, which results in an introduction of an effective and economic scheme for respective railway systems. Although the portion of thaw system is not quite large in the entire railway facilities, a significant energy saving and cost reduction can be expected if the proper system is employed.

• 한국농촌건축학회논문집
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• 제2권1호
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• pp.67-77
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• 2000

Environmental pollution has become a serious worldwide problem the humans has encountered in several decades. On the respect of the preservation of the global environment, world-wide consensus to cope with this problem was represented as 1992's Rio Declation. The purpose of this study is to develope evaluation technique of ecological architecture. The environmental scores of the buildings are evaluated and improved from the building design phase in order to build the best environmental building. Ecological architecture is mainly based on the balance of three element : Nature, Humanity, and Cost saving. Its main goals are energy saving and recycling, resource saving, high contact with circumstances, and health & amenity.

• Journal of Advanced Marine Engineering and Technology
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• 제11권1호
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• pp.39-52
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• 1987

Recently, the design problem of heat insulation have been reappraised in the aspect of energy saving due to the rising trend of energy cost. For example, that design problem is increasingly requsted in the fields of accommodation air conditioning systems, hot water supply systems, cargo handling systems, district heating or cooling systems. The rational design of heat insulation of piping systems can not only improve the overall efficiency of energy transfer but also give energy saving. In this paper, the heat insulation problem of district heating systems is therefore modeled as the multi-stage decision processes, suitable for dynamic programming technique. And take the object function as the sum of heat insulation material cost involved construction cost and heat loss cost, and propose the design method to minimize the object function for overall piping systems by dynamic programing. Effectiveness of design method presented here is proved by a computer simulation.

• 에너지공학
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• 제13권1호
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• pp.40-50
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• 2004

Treatise that see executed investigation analysis about energy conservation technology, which skill move and skill class of introduction subject, transferㆍintroduction skill form, present condition of technology transferㆍintroduction and necessity etc. to energy conservation technology by program of Korea energy basis plan (1997∼2006) etc. Enforced company which questionnaire object achieves from the end 107 assignment practical used of energy conservation technology development propulsion assignment of Korea energy management corporation (KEMCO) to 1998-200 years and 416 companies related energy saving technology constructed to Korea Institute of Energy Research (KIER) database by post investigation and visit investigation. Question investigation result, transferㆍintroduction fields of energy conservation technology are industry sector, the enterprise size appeared with the fact that the small and medium enteifrise is many most. Also, technology transferㆍintroduction section is plan technique, form with technical cooperative form, amount of money 50,000,000 won under, appeared above 1 years in disturbance duration. In hereafter, technology transferㆍintroduction plan it appeared with the fact that the plan technique is many most.

• 한국통신학회논문지
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• 제31권9A호
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• pp.884-891
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• 2006

무선 센서 네트워크에서의 센서 노드는 배터리로 동작하기 때문에 에너지에 대한 제약이 있다. 따라서 무선 센서 노드를 위한 효율적인 전력 관리 기법과 스케줄링 기법 설계가 중요한데, 본 논문에서는 운영체제 레벨의 소비 에너지를 줄이기 위한 알고리즘을 제안한다. 효율적인 배터리 사용을 위해 상황에 따라 필요한 컴포넌트에만 전원을 인가함으로써 센서노드의 에너지 소비를 줄일 수 있다. 본 논문에서는 제안한 알고리즘을 시뮬레이션 한 결과 기존의 duty 사이클과 비교하여 최대 56%의 에너지가 절약되었음을 알 수 있다.

• 한국태양에너지학회 논문집
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• 제34권1호
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• pp.8-18
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• 2014

Building simulation is used in a variety of sectors. In its early years, building simulation was mainly used in the design phase of a building for basic functions. Recently, however, it has become increasingly important during the operating phase, for commissioning and facility management. Most building simulation tools are used to estimate the thermal environment and energy consumption performance, and hence, they require the inputting of hourly weather data. A building simulation used for prediction should take into account the use of standard weather data. Weather data, which is used as input for a building simulation, plays a crucial role in the prediction performance, and hence, the selection of appropriate weather data is considered highly important. The present study proposed a technique for generating real-time weather data files, as opposed to the standard weather data files, which are required for running the building simulation. The forecasted weather elements provided by the Korea Meteorological Administration (KMA), the elements produced by the calculations, those utilizing the built-in functions of Energy Plus, and those that use standard values are combined for hourly input. The real-time weather data files generated using the technique proposed in the present study have been validated to compare with measured data and simulated data via EnergyPlus. The results of the present study are expected to increase the prediction accuracy of building control simulation results in the future.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2010년도 춘계학술대회
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• pp.276-277
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• 2010

본 논문은 RTGC 시스템의 에너지 절감을 위한 에너지 저장 시스템에 대해 다룬다. 에너지 저장 시스템으로는 배터리, 슈퍼캐패시터 그리고 플라이휠의 장정과 단점이 조사되었다. 이들 에너지 저장 시스템들 중 플라이휠 에너지 저장시스템은 현재 해결되어야 할 기술 및 가격적인 측면에도 불구하고 향후 기술의 발전을 전제를 뒀을 때 매우 촉망받는 에너지 저장시스템임이 조사되었다. 또한, 컨테이너 이송에 사용되는 RTGC에서 베터리와 플라이휠 에너지 저장 시스템이 각각 사용된 경우에 대해 에너지 절감에 대한 결과가 정량적으로 조사되었다.