• 사물인터넷융복합논문지
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• 제7권3호
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• pp.9-14
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• 2021

본 논문에서는 주택이나 건물의 단열 진단을 통하여 에너지 손실 요인을 발견하고 이에 따른 에너지 효율 개선에 대한 방향을 제시하고 있다. 건축물의 에너지 효율 요소는 단열 진단, 열교 진단, 창호 진단, 기밀 진단, 설비 진단 등으로 구성된다. 에너지 복지 사각지대 주민 및 시설 중 전라남도 나주시에 위치한 한 경로당 건물을 대상으로 하여 에너지 효율 진단을 실시하고 단열 시공을 한 후의 에너지 효율 진단을 실시하였다. 에너지 측정과 진단 및 분석은 IoT 기반 통합 유무선 에너지 진단 플랫폼인 에너지 파인더를 이용하였다. 비교 결과 전체적으로 16.38%의 에너지 절감률을 달성하였다. 연간 단위 면적당 난방 에너지 소요량은 시공 전 333.51kWh에서 시공 후 277.35kWh로 감소되었고, 연간 단위 면적당 냉방 에너지 소요량은 시공 전 5.51kWh에서 시공 후 5.22kWh로 감소되었다. 연간 단위 면적당 1차 에너지 소요량은 시공 전 464.52kWh 였으나 시공 후 403.69kWh로 감소되었으며, 연간 에너지 사용 비용은 시공 전 3,063,307.14원이었으나 시공 후 2,641,072.49원으로 절감되었다. 단열 이외의 에너지 효율에 영향을 미치는 기준들에 대한 추가적인 개선 작업이 필요하다고 판단된다.

• 사물인터넷융복합논문지
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• 제6권1호
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• pp.23-30
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• 2020

본 논문에서는 주택이나 건물의 에너지 손실 요인을 발견하고 이를 개선하기 위한 방안을 도출하기 위한 에너지 관리 방향을 제시하고 있다. 대중성과 편의성이 큰 강점인 스마트폰 탈부착형 열화상 카메라를 주택 전문가들만이 아닌 일반인들이 생활 속에서 활용할 수 있도록 생활 속 활용 진단 콘텐츠 앱을 설계하였다. 이 앱을 활용한 진단 결과를 에너지 효율 진단 솔루션인 에너지 파인더를 이용하여 분석하였다. 에너지 복지 사각지대 주민 및 시설 중 특히 지역 노인들이 자주 이용하는 경로당을 대상으로 진단 조사하였다. 진단 대상은 전라남도 나주시에 위치한 경로당 600여개소 중 15년 이상 노후 시설 30개소를 선정하여 에너지 효율 진단을 실시하였다. 진단 결과는 전반적으로 양호한 편이었지만, 7등급으로 분류된 곳은 에너지 효율 개선을 위한 보완이 필요하다고 판단된다.

• 조명전기설비학회논문지
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• 제26권6호
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• pp.66-72
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• 2012

The main sources of energy consumption in warehouses are MHE(Material Handling Equipment), HVAC(Heating, Ventilating and Air Conditioning) and Lighting. Warehouses in advanced countries raise energy efficiencies with energy consumption diagnosis, technology development and systematic management and improvements for MHE, HVAC and Illuminating, etc. They have managed illuminating system, air conditioning, motor driven system, air circulation method, dock facility, layout, AS/RS, conveyor system and battery management, etc. Ansong Pyeongtaek area investigation resulted that 43.9[%] of enterprises are managing partly energy consumption source. But the data resulted with not substantial management of energy consumption but passive management for only electric bill curtailment. Therefore through survey research & visiting interviews of some companies in Ansong Pyeongtaek area, we understood the status of energy consumption source management and proposed energy efficiency methods on the basis of that results.

• 드라이브 ㆍ 컨트롤
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• 제17권2호
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• pp.38-44
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• 2020

Various efforts have been initiated to reduce the energy consumption of the compressor as it is one of the approaches to saving a large portion of the fixed cost of the production site. Various results of reducing the energy consumption of the compressor have been reported, but to reduce the energy consumption of the compressors fundamentally, regular management of the compressor should ensure optimum operation. This requires periodic on-site visits by experts, but is often overlooked as a cost issue, resulting in the use of the compressor in low-efficiency conditions. Thus, it is necessary to develop a low-cost evaluation technology for compressor condition monitoring and efficiency analysis to ensure that the compressor is always driven at the optimum efficiency without imposing undue burden on the compressor user. In this study, a sensor was installed at the inlet, outlet, and power supply of the compressor, and a method for evaluating the energy consumption of the compressor using the minimum sensor was derived. The experimental results are presented to show the validity of the proposed method. It was confirmed that the energy consumption of the compressor can be easily as well as efficiently evaluated by using the method developed in this study.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 1999년도 춘계학술발표논문집
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• pp.45-48
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• 1999

• 드라이브 ㆍ 컨트롤
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• 제9권4호
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• pp.8-13
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• 2012

Recently, researches about the eco-friendly vehicles such as hybrid electric vehicle, fuel cell vehicle and electric vehicle have been actively carried out. The regenerative braking system is a key technology to improve the vehicle energy utilization efficiency because it transforms the kinetic energy to the electric energy through the electric motor. This new braking system requires cooperative control between electric controlled brake and regenerative brake. Therefore, it is necessary to establish fault-diagnosis and fail-safe evaluation criteria to secure reliability of the regenerative braking system. In this paper, the failure types and causes in regenerative braking system were analyzed. The transient behavior characteristics were examined based on fault-diagnosis and fail-safe upon failure of regenerative braking system.

• 한국태양에너지학회 논문집
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• 제31권3호
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• pp.17-22
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• 2011

Techniques for mismatch loss minimization to increase the PV system efficiency are under development recently. In this paper, a method to make diagnosis of PV module mismatch is presented, which uses a concept of operating point factor. The method is based on the fact that the ratio of the incremental conductance of a PV module to instantaneous conductance is 1 when the module is operating at its maximum power point. The variations of module voltage and current are taking place by the maximum power point tracker in the power conditioning units of PV system. The effectiveness of the method is verified through an application to a real PV system.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권10호
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• pp.4883-4901
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• 2016

Energy efficiency in Wireless Sensor Networks (WSNs) is very appealing research area due to serious constrains on resources like storage, processing, and communication power of the sensor nodes. Due to limited capabilities of sensing nodes, such networks are composed of a large number of nodes. The higher number of nodes increases the overall performance in data collection from environment and transmission of packets among nodes. In such networks the nodes sense data and ultimately forward the information to a Base Station (BS). The main issues in WSNs revolve around energy consumption and delay in relaying of data. A lot of research work has been published in this area of achieving energy efficiency in the network. Various techniques have been proposed to divide such networks; like grid division of network, group based division, clustering, making logical layers of network, variable size clusters or groups and so on. In this paper a new technique of group based WSNs is proposed by using some features from recent published protocols i.e. "Energy-Efficient Multi-level and Distance Aware Clustering (EEMDC)" and "Energy-Efficient Multi-level and Distance Aware Clustering (EEUC)". The proposed work is not only energy-efficient but also minimizes the delay in relaying of data from the sensor nodes to BS. Simulation results show, that it outperforms LEACH protocol by 38%, EEMDC by 10% and EEUC by 13%.

• KIEAE Journal
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• 제17권4호
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• pp.41-48
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• 2017

Purpose : Currently, 25% of the domestic energy consumption structure is used as building energy, and more than 18% of this energy is consumed in the residential. Accordingly, various efforts and policies that can save energy of the building is being performed. The various researchers are conducting research to diagnose the thermal performance of existing buildings. This study is to apply in the field of precision thermal insulation performance diagnostic method for thermal performance analysis of existing detached house in Seoul, Gangreung, Gyeongju, Pohang. And this paper is analyzed quantitatively measure the existing detached house energy performance. Method: Research methodology analyzed the thermal performance over the Heat Flow Meter method by applying the measurement process and method by applying the criteria of ISO 9869-1 & ASTR method. In this study, the surface heat transfer coefficient was calibrated by applying indoor surface heat transfer resistance with reference to ISO 6946 standard. The measurement error rate between the HFM diagnosis method and the ASTR diagnosis method was reduced and the measurement reliability was obtained through measurement method error verification. Result : As a result of the study, the thermal performance vulnerable parts of the building were quantitatively analyzed, and presented for methods which can be improved capable of efficient energy use buildings.

• 디지털융복합연구
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• 제9권2호
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• pp.141-152
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• 2011

오늘날 데이터센터는 비즈니스에서 핵심영역으로 인식되고 있으며, 이들에 대한 많은 서비스 요구는 보다 많은 에너지 소비를 낳고 있다. 따라서 데이터센터의 높은 수준의 에너지 효율성은 구축, 운영, 폐기 등 그들의 생명주기에 있어서 핵심이슈로 등장하였다. 본 연구에서는 이러한 생명기상에서 데이터센터의 그린화 수준을 진단할 수 있도록 성숙도모델에 기초한 그린데이터센터 수준진단모델을 제시한다. 본 연구에서 제시한 수준진단 모델은 엑션추어 GMM, DCEEF 등 기존 에너지평가모델 및 그린데이터센터 성숙도평가 모델을 참조하였으며, 최종적으로 건축, 공조, 전기, IT, 조직 등 데이터센터의 5개 핵심영역에 대한 진단지표를 제안하였다.