• Title, Summary, Keyword: Energy efficiency

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Heating Energy Efficiency Improvement Analysis of Low-income Houses (저소득층 단독주택의 난방에너지효율 향상 연구)

  • Lee, Sung-Jin;Kim, Jong-hun;Jeong, Hak-geun;Yoo, Seung-hwan;Lee, Jung-hun
    • 한국건축친환경설비학회 논문집
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    • v.11 no.3
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    • pp.212-218
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    • 2017
  • This study analyzed the energy consumption of a reference low-income house by windows, walls, equipment conditions and, based on these results, suggested ways to improve the energy efficiency of low-income houses. The energy consumption of the reference house was calculated to be $231.4kWh/(m^2{\cdot}a)$, which required an energy efficiency improvement of about 25.1% compared to the energy performance guideline ($173.2kWh/(m^2{\cdot}a)$). The energy consumption of the low-income houses was influenced in the following order: thermal resistance of wall (U-value) > efficiency of equipment (Boiler) > airtightness > window type (U-value & SHGC) > window-to-wall ratio. The maximum energy saving efficiency could be improved up to 25.1% in the range of simulation conditions set in this study. Additional further studies such as economic analysis and LCC(Life Cycle Cost) analysis should be taken into consideration to propose a final energy efficiency improvement.

Study on Appliance Energy Efficiency Standards (가전기기 에너지소비효율 기준설정에 관한 연구)

  • 이선근;최수현
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • pp.144-150
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    • 1996
  • The Energy Efficiency Standards and Labelling Act, as amended by the Rational Energy Utilization Act, provides energy efficiency standards and labellings for six equipment categories(viz, refrigerators, air-conditioners, fluorescent lamps and ballasts, incandescent lamps, cars) authorizes the Ministry of Trade. Industry and Energy (MOTIE) to prescribe amended or new energy efficiency standards and labelling standards. This study was initiated by the KIER(Korea Institute of Energy Research) in 1992. KIER's assessment of the appliance energy efficiency standards is designed to evaluate their statistical and engineering analysis according to Korean Industrial Standards(KS). And to make didtinction between the poor efficiency and good efficiency models. 5 grades are classified depending on their tested energy efficiency. This year, based on our analysis, MOTIE mandated updated standards for refrigerators, air-conditioners, Incandescent lamps, and fluorescent lamps.

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Analyzing the Impact of Inventory Management Performance on the Energy Efficiency in Korean Petrochemical Companies (재고관리성과가 에너지효율성에 미치는 영향에 대한 실증분석 : 국내 석유화학 기업을 대상으로)

  • Kim, Gilwhan;Lee, Jiwoong
    • Korean Management Science Review
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    • v.34 no.3
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    • pp.1-14
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    • 2017
  • This study empirically analyzes the impact of inventory management performance on the energy efficiency in Korean petrochemical companies. The concept of the distance function is used to define the energy efficiency and the estimation of the distance function is performed using the stochastic frontier analysis. The inventory turnover is selected as the variable indicating the inventory management performance of the company. The main results of this study are as follows. First, the inventory turnover has a positive impact on energy efficiency. Second, during the period over 2011~2015, while the gap in energy efficiency among the companies expanded, the average energy efficiency decreased. Third, the average energy efficiency in upstream process companies was greater than downstream process companies and the gap in energy efficiency among downstream process companies was greater than upstream process companies. Fourth, the average marginal effect of inventory turnover on energy efficiency increased gradually from 2011 to 2015. Finally, the average marginal effect of inventory turnover in downstream process companies was greater than upstream process companies, and the gap in the marginal effect of inventory turnover among downstream process companies was greater than upstream process companies. These results together imply the importance of inventory management in terms of energy efficiency.

Energy efficiency retrofit package plan for existing buildings (기존 건축물의 에너지 효율화 리트로핏 패키지 방안)

  • Kim, Su Min;Cho, Hyun Mi
    • LHI Journal of Land, Housing, and Urban Affairs
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    • v.11 no.1
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    • pp.95-101
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    • 2020
  • In the past few decades, the global population growth and rapid economic development have resulted in significant increases in building energy consumption. To reduce greenhouse-gas emissions and building energy consumption, building materials and energy technologies must be optimized. Building retrofitting is a more efficient method than reconstruction to improve the building energy performance. In order to improve the energy performance of existing buildings, this study proposed energy-efficiency retrofit plans and derived cost-effective retrofit plan. The energy efficient retrofit method is achieved through the packaging of energy technology and the energy and cost reduction effect of the energy efficiency retrofit package are analyzed. As a result of the study, the energy-efficiency retrofit package showed an energy reduction effect of up to 60% or more and a construction cost reduction of about 30%. This study argues that optimal energy and construction cost reduction of existing buildings are possible through the packaging of energy efficiency technology.

Measurement of Energy Efficiency For the Reduction of Greenhouse Gases (온실가스 감축에 대비한 에너지 효율의 계측)

  • Kang, Sang-Mok
    • Journal of Environmental Policy
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    • v.11 no.1
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    • pp.75-97
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    • 2012
  • The purpose of the paper is to estimate the functions of the energy input efficiency and the energy intensity efficiency, and measure their energy efficiencies for the reduction of greenhouse gases focusing on OECD countries. The efficiency of the traditional energy intensity was rarely connected with the energy efficiencies of the stochastic frontier function. It seems that the energy efficiency by the function of energy input efficiency sensitively responds to the order of GDP, capital stock, labor, and energy input quantity as explanatory variables. In the future, we need to reduce energy quantities by the optimal mix of inputs, and pursuit low-carbon economic growth through the production of the goods consuming small energy.

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Energy Efficiency Evaluation of IT based Ship Energy Saving System-(2) : Ship Test Results (IT기반의 선박에너지절감시스템 성능평가 방법-(2) : 해상시험 수행 결과)

  • Yoo, Yun-Ja
    • Journal of Navigation and Port Research
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    • v.40 no.4
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    • pp.165-171
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    • 2016
  • SEEMP (Ship Energy Efficiency Management Plan) has entered into force since 2013 for the reduction of GHG emission of operating ships. SEEMP guidelines include the hardware modification or installation of energy-saving device on ship. It also includes software based energy-saving technology such as optimum routing, speed optimization, etc. Hardware based technologies are not easy to apply to ongoing vessel due to the operational restriction. Therefore, IT based energy-saving technology was applied and its energy efficiency was evaluated using before and after energy-saving system applied voyage data. SEEMP advises a voluntary participation of EEOI (Ship Energy Efficiency Operation Indicator) use as an indicator of ship energy efficiency operation, and those results were also shown to evaluate the improvement efficiency of energy-saving system.

Comparison of Energy Efficiency by Production Frontier Approach: Based on OECD Countries (생산 프론티어 접근을 통한 에너지효율 비교: OECD 국가를 중심으로)

  • Kang, Sangmok;Kim, Haechang
    • Environmental and Resource Economics Review
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    • v.20 no.1
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    • pp.33-60
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    • 2011
  • The purpose of the article is to compare the impacts of energy efficiency and economic growth for energy demand through production frontier approach in OECD countries. We compared the traditional energy intensity with energy efficiencies of production frontier approach, slack efficiency on the frontier, and estimated elasticity of energy demand for GDP growth. First, the energy intensity has a low relationship with energy efficiency by radial approach, but has constant correlations with slack energy efficiency, slack-adjusted efficiency by non-radial approach, and energy efficiency by horizon approach. If we measure energy efficiency only with energy elasticity, it may make a mistake. Especially the energy efficiency by radial approach has a tendency to overestimate most OECD countries. Second, as many countries have excess energy consumption of 17.3% even on the points of the frontier, reduction of energy consumption is necessary in addition. Third, the average energy elasticity of OECD countries is 1.1 close to elasticity 1. There exists the difference of elasticity among countries and the energy demands are also high in countries with high elasticity.

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Design Principles and Validation of a Human-sized Quadruped Robot Leg for High Energy Efficiency (에너지 효율적인 인간 크기 4족 보행 로봇의 설계와 검증)

  • Yeom, Hoyeon;Ba, Dang Xuan;Bae, Joonbum
    • The Journal of Korea Robotics Society
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    • v.13 no.2
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    • pp.86-91
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    • 2018
  • This paper presents about design efforts of a human-sized quadruped robot leg for high energy efficiency, and verifications. One of the representative index of the energy efficiency is the Cost of Transport (COT), but increased in the energy or work done is not calculated in COT. In this reason, the input to the output energy efficiency should be also considered as a very important term. By designing the robot with customized motor housing, small rotational inertia, and low gear ratio to reduce friction, high energy efficiency was achieved. Squatting motion of one leg was performed and simulation results were compared to the experimental results for validation. The developed 50 kg robot can lift the weight up to 200 kg, and during squatting, it showed high energy efficiency. The robot showed 71% input to output energy efficiency in positive work. Peak current during squatting only appears to be 0.3 A.

Study on Evaluation of Energy Efficiency Rating of the Buildings (건축물의 에너지효율등급 평가에 관한 연구)

  • Son, Won-Tug;Choi, Young-Sik
    • Journal of the Korean Society of Industry Convergence
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    • v.15 no.3
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    • pp.65-69
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    • 2012
  • Since 2010, enhancement of the building energy efficiency and certification system and public office building should have been acquiring the first grade of Building Energy Efficiency. The Building Energy Efficiency Rating evaluation tool and Dynamic Analysis Energy simulation program for Building Energy Efficiency are widely used. The suitability to those programs have been discussed as a variety of programs have been used accordingly. In this study, evaluated the characteristic of Building Energy Efficiency Rating tool(ECO2) of the business building. At a result, the variables on the Weather Data, building Profile and building Load property in hourly between those Building Energy Efficiency evaluation tools have different.

The Energy-efficiency Analysis of Companies in Korea Using DEA (DEA를 활용한 국내 기업의 에너지효율성 분석)

  • Moon, Hana;Min, Daiki
    • Korean Management Science Review
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    • v.32 no.3
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    • pp.37-54
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    • 2015
  • This paper suggests energy efficiency which can be the foundation on corporate profit and effective energy management following by change of global climate and of energy-related regulations. Using comparable financial information and information related to energy use, an DEA (Data Envelopment Analysis) model has been used to identify energy efficiency with DMU (Decision Making Unit)s which are companies subjected to reduce greenhouse gas emission in 2009. Through this research, different from existing researches, environmental variables which can influence on energy efficiency are identified. The results show as follows. First, most of companies follow IRS, which means scale of economy exists among units so that they have more opportunity to increase efficiency by increasing scale of inputs. Second, this research identified that depending on the difference of environmental characters such as the emission structure and the size of companies, energy efficiency of the companies turns out differently.