• 전자공학회논문지
• /
• 제49권9호
• /
• pp.27-34
• /
• 2012

오늘날 ICT 네트워크에서 에너지 소모는 전체 에너지 소모의 10% 내외로 가까운 미래에 에너지가 현저하게 증가 할 것이다. 그러한 이유로 ICT 네트워크에서 에너지를 절약하려는 연구가 상당히 활발하게 이루어지고 있다. 본 논문에서 네트워크 레벨에서 네트워크 품질을 보장하면서 에너지 절약이 가능한 방법을 검토한다. 네트워크를 구성하는 노드와 링크는 에너지 프로파일에 따라 에너지가 소모된다고 가정하였다. 특히 IP 네트워크에서, 다양한 에너지 프로파일 모델을 기본으로 하여 네트워크가 소모하는 에너지 모델을 정식화하고, IP 네트워크 품질을 만족하면서 에너지 절약이 가능한 energy-aware QoS 라우팅 방안을 제시하고 검토한다. 본 논문에서 시뮬레이션을 이용하여, 에너지 프로파일에 따라 IP 네트워크가 소모하는 에너지의 차이가 크며, 적절한 에너지 프로파일 모델을 개발한다면 에너지 절약이 가능함을 보여 준다. 또 IP 네트워크의 품질을 유지하면서 에너지 절약이 가능한 energy-aware QoS 라우팅 중 min_used_path(MP) heuristic을 이용한 방법이 네트워크의 노드 및 링크의 감소율이 다른 방법에 비해 우수하고, 에너지 절약 효과가 다른 방법에 비해 우수함을 분명히 한다. 따라서 결론적으로 본 논문에서는 energy-aware QoS 라우팅의 한 방법인 min_used_path(MP) heuristic을 적용하여 네트워크 품질 유지하면서 에너지를 절약 할 수 있음을 확인 하였다.

• 수산해양기술연구
• /
• 제49권1호
• /
• pp.58-66
• /
• 2013

Most of steam power plant in Korea are heating the feed water system to prevent freezing water flowing in the pipe in winter time. The heating system is operated whenever the ambient temperature around the power plant area below 5 degree Centigrade. But this kind of heat supplying system cause a lot of energy consuming. If we think about the method that the temperature of the each pipe is controled by attaching the temperature measuring sensor like RTD sensor and heat is supplied only when the outer surface temperature of the pipe is under 5 degree Centigrade, then we can save a plenty of energy. In this study, the computer program package for simulation is used to compare the energy consumption load of both systems. Energy saving rate is calculated for the location of Youngweol area using the data of weather station in winter season, especially the January' severe weather data is analyzed for comparison. Various convection heat transfer coefficients for the ambient air and the flowing water inside the pipe was used for the accurate calculation. And also the various initial flowing water temperature was used for the system. Steady state analysis is done previously to approximate the result before the simulation. The result shows that the temperature control system using RTD sensor represents the high energy saving effect which is more than 90% of energy saving rate. Even in the severe January weather condition, the energy saving rate is almost 60%.

• 한국태양에너지학회 논문집
• /
• 제39권2호
• /
• pp.57-69
• /
• 2019

Because the hospital building operates 24 hours a day, 365 days a year for treatment and restoration of patients, it has a different pattern of energy use than that of ordinary buildings. Hospitals contribute to energy consumption and have a negative environmental impact. This study aims to find how meaningful energy performance, reflecting good energy management and ECMs, can be operated for hospital buildings, a category encompassing complex buildings with different systems and large differences between them. In this study, we proposed the energy diagnosis & evaluation method and energy management process to verify energy saving through operation data based on system & facility characteristics, operation pattern and energy consumption characteristics of hospital building. Energy consumption structures were surveyed throughout 4 reference hospital in Seoul, Korea. Findings confirm that different hospital departments have hugely different energy-demand profiles. Energy efficiency and energy saving potentials are presented. The energy performance analysis can be applied to a wide range of problems in energy-system operation.

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2008년도 하계학술발표대회 논문집
• /
• pp.819-824
• /
• 2008

Energy consumption in Korea and Japan has already progressed to high level. Especially, it will be important to take up the effort to achieve further energy savings in residential sector that has significant increase both nations. For this reason, research for energy consumption and saving method in residential sector compare Korea with Japan that of similar data to grasps the direction for energy savings. In addition for introduction of distributed energy system to residential sector, such as apartment house, the electricity and gas demand was simulated. To be more specific, several key characteristics were studied, such as housing type housing scale and width of common space.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2015년도 춘계 학술논문 발표대회
• /
• pp.198-199
• /
• 2015

Construction equipment is a major energy consumption source in construction projects. If 10% reduction of the diesel fuel usage is achieved in the construction industry, it may reduce 5% of the total energy usage. Energy saving operation is a major issue in equipment-intensive operations (e.g., earthmoving or paving operations). Identifying optimal equipment fleet is important measure to achieve low-energy consumption in those operations. This study presents a system which finds an optimal equipment fleet by computing the low-energy performance of earthmoving operations. It establishes construction operation model and compares numerous combinations using alternative equipment allocation plans. It implements sensitivity analysis that facilitates searching the lowest energy consumption equipment fleet by enumerating all cases.

• 한국통신학회논문지
• /
• 제40권7호
• /
• pp.1296-1306
• /
• 2015

오늘날 IP 네트워크에서 소모되는 에너지를 줄이기 위해 여러 곳에서 다양한 방법으로 연구되어 왔다. 본 논문은 다양한 에너지 프로파일을 갖는 IP 네트워크에서 에너지를 감소시키는 한 방법을 제안하고, 그 특성을 자세히 분석한다. 에너지 프로파일 기반 OSPF 라우팅 방식을 제안하면서, 경로 설정 시 기존 OSPF 방식의 metric과 네트워크 소자의 에너지 소모량에 가중치를 부여하여, 최대 에너지 절약 효과를 얻기 위해 다양한 경우에 대해서 분석한다. 그 결과 본 논문의 제안 방식은 IP 네트워크의 각 소자에 랜덤한 에너지 프로파일을 적용하면, 입력 라우터의 평균 입력 부하가 0.5일 때 기존의 운영 방식에 비해 67% 정도 에너지를 절약 할 수 있음을 확인한다. 그리고 본 방식의 알고리즘은 최소 에너지 소모가 되도록 라우팅하기 때문에 기존 라우팅 방식에 비해 경로의 홉 수가 다소 증가하고 있지만, 평균 홉 수 증가는 1.4홉 이내로 제한되고 있다. 그리고 본 방식이 실제 IP 네트워크 적용될 때, 에너지 절약 효과가 우수함을 나타낸다.

• 전기학회논문지P
• /
• 제60권4호
• /
• pp.236-240
• /
• 2011

Currently one of the most importance issues in industrial sector is energy cost and energy efficiency. The manufacturing plants especially have made many efforts to reduce energy cost by implementing maintenances. But in many cases, they are not aware that how much energy could be saved more. If we know the best energy consumption, which signifies energy baseline, we can control the intensity of maintenances. One way to obtain the baseline is using proper statistics from a specific plant, a sector of industry. Energy bandwidth signifies the gap between actual Specific Energy Consumption(SEC) of a certain plant and minimum SEC of the best plant, and estimate energy saving potential(ESP) is a result of bandwidth analysis. We chose a model plant and implemented some maintenance for a year, and then we obtained ESP. Additionally we could determine the decreased amount of carbon emissions from the plant using Carbon Emissions Factor(CEF) by Intergovernmental Panel on Climate Change(IPCC).

• 설비공학논문집
• /
• 제24권4호
• /
• pp.343-350
• /
• 2012

The major goal of building energy management is to minimize the energy consumption while maintaining the comfortable environment condition. Nowadays building energy management to save HVAC energy and so on is the most critical issue for existing building service branch with high efficiency equipments and their optimal operation. The effects on the building energy savings of the building equipment retrofit and the improvement of its operation method, especially in the field of HVAC system, were analyzed in this study for domestic small and/or medium sized buildings. Over 8.8% of energy saving was achieved compared withe total energy consumption in commercial building. These results could be used for reasonable maintenance and efficient management of the various building service equipments and related systems.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
• /
• pp.3027-3031
• /
• 2011

In this study, By the time that TTX technology is adopted as railway rolling stock, we analyzed quantitatively energy saving by reducing the power consumption with the reduction of the operation time through the speed improvement and suggested the necessity to introduce TTX technology in the domestic rail vehicles. The effect of energy saving by comparing and analyzing the power consumption during the operation by TTX Hanvit 200 and 8200 electric locomotives to pull trains on the same line was suggested and the efficiency of the main devices(i.e C/I) of Hanvit 200 was compared and analyzed by measuring the power consumption by a single unit. For improving KORAIL management environment, reducing energy usage is an urgent challenge, its measures for solving them are constantly considered in many areas. In addition, at the time of improving the conventional track to speed up and changing the signals, Tilting technology will be contributed to the management environment by enlarging the passengers' demand through the reduction of the operation time and saving energy using the existing infrastructure.

• 조명전기설비학회논문지
• /
• 제29권1호
• /
• pp.47-56
• /
• 2015

Energy consumption in buildings is currently a real problem. That is why both assessment of energy performance and effective energy management including renewable energy system are essential. Thus, this paper focuses on a case study to analyze the energy performance and cooling & heating energy saving of a large scale shopping store in Daejeon city. The reference building is simulated by using TRNSYS dynamic simulation tool to examine its annual energy consumption. For annual energy analysis of building, one year energy consumption is surveyed in the field. The related study is carried out in large scale shopping store to investigate the energy consumption and energy use trend of heating, cooling, hot water, lighting, ventilation, equipments and other. The evaluation of energy performance of the geothermal heat pump system installed in a large scale shopping store is also analyzed by TRNSYS tool. From simulation results, it evaluated that the geothermal heat pump system is effective energy savings method in large scale shopping store.