• 제목/요약/키워드: Energy improvement

검색결과 3,496건 처리시간 0.032초

5ESS-2000 통신장비실의 열환경특성과에너지성능 개선방안에 관한 연구 (A Study on the Characteristics of Thermal Environment and Improvement of Energy Performance in 5ESS-2000 Telecommunication Equipment Room)

  • 이승복;조춘식
    • KIEAE Journal
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    • 제4권4호
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    • pp.19-26
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    • 2004
  • The purpose of this study was to evaluate the thermal environment of present state and energy consumption and to verify the improvement of energy performance applying free cooling in 5ESS-2000 telecommunication equipment room. Analysis program is used the DOE-2.1E and commercial CFD code, Star-CD. The results of the simulation show that free cooling could reduce 42.1% of cooling energy, increase 48.5% of heating energy because introduced outdoor air must heating and humidification. Therefore free cooling could reduce yearly 34,609.9 kWh of heating and cooling energy and this is reaching to 21.6% of total energy.

건축물 단열 진단을 통한 에너지 효율 개선에 관한 연구 (A Study on Energy Efficiency Improvement through Building Insulation Diagnosis)

  • 조광문
    • 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.

직류도시철도 시스템에서 저장장치 단위 용량 당 에너지 절감 효과 분석 연구 (Efficiency Improvement Effect Analysis for Marginal Storage Capacity in DC Electric Railway Systems)

  • 이한상;윤동희;김형철;주성관;정호성
    • 전기학회논문지
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    • 제63권8호
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    • pp.1159-1163
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    • 2014
  • This paper have been dealt with the analysis for energy efficiency improvement effect of unity storage capacity as a part of the energy storage application study to improve energy efficiency in the electric railway systems. Especially, in order to estimate the amount of energy saving according to the variation of power capacity of each storage, the current limit module was mounted on an existing DC electric railway loadflow program which is based on the analysis model for railway system and storages, and combined optimization algorithm to determine optimal voltage boundary.

기반기금 지원 신재생에너지 발전에 대한 소내소비전력 처리방안 연구 (A Study on an Improvement Plan of Plant-Use Electricity for New & Renewable Energy Supported by Electric Power Industry Basis Fund)

  • 전병규;김재성
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2007년도 추계학술대회 논문집
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    • pp.678-681
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    • 2007
  • Now Korea depends upon the imported resources for about 97% of total using energy. So from October, 2001 Korean government has supported renewable energy business owners by providing them with Electric Power Industry Basis Fund. Only plant-use electricity of the small hydro power plant is exactly managed, but other renewable energy plants is unprepared or not yet managed. Therefore, in this paper, we'll analyze the plant-use electricity management of the small hydro power and propose improvement plans for plant-use electricity of the photovoltaic power plant.

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Can cities become self-reliant in energy? A technological scenario analysis for Kampala, Uganda

  • Munu, Nicholas;Banadda, Noble
    • Environmental Engineering Research
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    • 제21권3호
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    • pp.219-225
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    • 2016
  • Energy self-reliance is important for economic growth and development for any nation. An energy self-reliance technological analysis for Kampala the capital city of Uganda is presented. Three renewable energy sources: Municipal Solid Waste (MSW), solar and wind are assessed for the period of 2014 to 2030. Annual MSW generation will increase from $6.2{\times}10^5$ tons in 2014 to $8.5{\times}10^5$ and $1.14{\times}10^6$ tons by 2030 at 2% and 3.9% population growth respectively. MSW energy recovery yield varies from 136.7 GWh (2014, 65% collection) to 387.9 GWh (2030, 100% collection). MSW can at best contribute 2.1% and 1.6% to total Kampala energy demands for 2014 and 2030 respectively. Wind contribution is 5.6% and 2.3% in those respective years. To meet Kampala energy demands through solar, 26.6% of Kampala area and 2.4 times her size is required for panel installation in 2014 and 2030 respectively. This study concludes that improving renewable energy production may not necessarily translate into energy self-reliant Kampala City based on current and predicted conditions on a business as usual energy utilization situation. More studies should be done to integrate improvement in renewable energy production with improvement in efficiency in energy utilization.

사례연구 설문조사에 의한 주택에서의 에너지소비 실태조사와 개선방안 연구 - 제천시 거주 주민을 대상으로 - (A survey on energy consumption and improvement method for energy conservation - Targeting dwellers in Jecheon city -)

  • 이철구
    • 한국지열·수열에너지학회논문집
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    • 제9권1호
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    • pp.1-7
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    • 2013
  • With the architectural energy saving technique such as building insulation, airtightness etc., changing the indoor temperature and shortening the air conditioning time etc. are the good methods to practice energy saving in our lives. This study aims to seek a way to realize energy saving under investigation through a questionnaire survey about energy consumption condition and energy saving perception. 93% of the respondents recognized the need for energy saving, and 67% said more energy saving would possible in homes. Viable energy saving way was questioned by five steps method. More than 50% responded 'possible' or 'seems possible' at most of the items. Whereas less than 50% responded 'possible' or 'seems possible' at the items of 'lessening the cooling time' and 'lessening the shower time'. Ages of 50s who responded 'possible' or 'seems possible' was relatively less compared to 30s and 40s.

국내 하수처리시설 에너지 등급 평가를 위한 ENERWATER의 적용 가능성에 관한 연구 (A Study on the Applicability of ENERWATER for Evaluation of the Energy Consumption Label of WWTPs in Korea)

  • 박민오;이호식
    • 한국물환경학회지
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    • 제38권5호
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    • pp.231-239
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    • 2022
  • In this study, we applied ENERWATER to evaluate the energy consumption labeling of wastewater treatment plants in Korea using the Korea sewerage statistics data. The results showed that the energy label status was excellent in the SBR process for small and medium-scale wastewater treatment plants and the A2O process for large-scale wastewater treatment plants. The energy labeling of wastewater treatment plants of 50,000 tons capacity was excellent. The statuses of metropolitan cities and Jeollanam-do province were excellent. We analyzed the effects of renewable energy on wastewater treatment plants' energy consumption and found out that digestion gas for large-scale plants and photovoltaic energy for small-scale plants were effective in improving energy labeling. In addition, we compared the energy labels of four wastewater treatment plants in "Z" city and wastewater treatment plant "X" had the best energy label, and the wastewater treatment plants "V" and "Y" had to be selected as priorities for the energy diagnosis and improvement project. In a comprehensive conclusion, the applicability of ENERWATER was confirmed based on sewage statistics data and labeling can be used to set priorities for the energy diagnosis and improvement project.

풍력 발전 예보 정확도 향상을 위한 국지 기상장 수치모의 개선 방안 연구 (A Study on Effect of Improvement Plan for Wind Energy Forecasting)

  • 정지아;이화운;전원배;김동혁;김현구;강용혁
    • 한국대기환경학회지
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    • 제31권1호
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    • pp.1-14
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    • 2015
  • This study investigates the impact of enhanced regional meteorological fields on improvement of wind energy forecasting accuracy in the southwestern coast of the Korean Peninsula. To clarify the effect of detailed surface boundary data and application of analysis nudging technique on simulated meteorological fields, several WRF simulations were carried out. Case_LT, which is a simulation with high resolution terrain height and land use data, shows the most remarkable accuracy improvement along the shoreline mainly due to modified surface characteristics such as albedo, roughness length and thermal inertia. Case_RS with high resolution SST data shows accurate SST distributions compared to observation data, and they led to change in land and sea breeze circulation. Case_GN, grid nudging applied simulation, also shows changed temperature and wind fields. Especially, the application of grid nudging dominantly influences on the change of horizontal wind components in comparison with vertical wind component.

Improvement of Out-of-Plane Impact Damage Resistance of CFRP Due to Through-the-Thickness Stitching

  • Yoshimura, Akinori;Nakao, Tomoaki;Takeda, Nobuo
    • Advanced Composite Materials
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    • 제18권2호
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    • pp.121-134
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    • 2009
  • The present study investigated, both experimentally and numerically, the improvement of low-velocity impact damage resistance of carbon fiber reinforced plastic (CFRP) laminates due to through-the-thickness stitching. First, we conducted drop-weight impact tests for stitched and unstitched laminates. The results of damage inspection confirmed that stitching did improve the impact damage resistance, and revealed that the improvement effect became greater as the impact energy increased. Moreover, the stitching affected the through-the-thickness damage distribution. Next, we performed FEM analysis and calculated the energy release rate of the delamination crack using the virtual crack closure technique (VCCT). The numerical results revealed that the stitching affected the through-the-thickness damage distribution because the stitch threads had a marked effect on decreasing both the modes I and II energy release rate around the bottom of the laminate. Comparison of the results for models that contained delaminations of various sizes revealed that the energy release rate became lower as delamination size increased; therefore the stitching improved the impact resistance more effectively when the impact energy was higher.