• 한국수소및신에너지학회논문집
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• 제28권3호
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• pp.287-294
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• 2017

EVs manufacturers typically target a range of 300 km on a fully charged battery. Many studies have been conducted to improve these disadvantages. As a results, the mileage of EVs is expected to increase significantly. However, as the distance traveled by EVs increases, current test method (SCT) have many difficulties. The biggest problem is that it takes a lot of time to test an EVs and greatly increases the error rate during the test period. In order to solve these problems, this paper discusses the fuel economy test method of EVs for energy efficiency and mileage. The comparison of test methods was achieved by chassis dynamometer test about EVs. These review of test methods are intended to both improve testing efficiency and provide a practical testing methodology that can be easily adapted to accommodate future testing enhancements. In conclusion, the results of MCT mode and SCT mode comparison show similar results within 3 %, confirming that the test method is appropriate. Also, as the CSCM distance becomes shorter in the MCT mode, the mileage becomes longer and the fuel economy becomes lower. As a result, the error from the SCT test results is expected to increase. In order to minimize the error of SCT measurement fuel economy, it is recommended to maximize the CSCM driving distance. However, since the timing of the EOT is not clearly known, it is reasonable to define the allowable range of the CSCE to be within 20 % of the MCT total mileage.

• 자원ㆍ환경경제연구
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• 제22권2호
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• pp.329-365
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• 2013

본 연구의 목적은 2000-2009년 국가별로 환경과 화석에너지의 제약 하에서 경제와 환경의 효율을 측정하고자 함이다. 본 연구는 국가별 소득수준에 따른 OECD국가, 중고소득국가, 저소득국가 등 세 그룹으로 구분하여, 생산가능집합에서 바람직한 산출물인 GDP와 오염물을 동시에 포함한 '환경지향형, 경제지향형, 환경-경제지향형, Two-stage DEA모형' 등의 네 가지 방법을 제시하여 비교한다. OECD국가는 상대적으로 경제효율성이 높으나 환경효율성은 낮았고 비OECD국가는 환경효율성이 높고 경제효율성이 낮았다. 화석에너지와 온실가스의 저감의 여지는 OECD국가가 더 높았다.

• 한국자동차공학회논문집
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• 제16권6호
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• pp.26-32
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• 2008

This research presents a simulation for the fuel economy of parallel diesel hybrid vehicle. Diesel engines compared to gasoline engines have the advantages of higher fuel economy and lower $CO_2$ emission. One of the most ways to meet future fuel economy and emissions regulation is to combine diesel engine technology with a hybrid electric vehicle. The simulation of HEV is growing need for rapid analysis of the many configurations and component options. WAVE, a one-dimensional engine analysis tool, was used to a 2.7L diesel engine. ADVISOR, designed for rapid analysis of the performance and fuel economy of vehicle models, was used to conventional and hybrid electric vehicle by the use of output file from WAVE as the input engine data file for ADVISOR. A parallel diesel HEV is at least $19.7{\sim}36%$ higher fuel economy and improved acceleration ability compared to a conventional diesel vehicle. The energy loss of the parallel diesel HEV is $23{\sim}38%$ less than the conventional vehicle using regeneration.

• 에너지공학
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• 제22권2호
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• pp.184-196
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• 2013

경제 발전과 산업의 발달로 화석연료를 대체할 신재생에너지 개발의 필요성이 대두되고 있다. 환경과 에너지 문제를 동시에 해결할 수 있는 에너지 개발이 필수적이며, 그 대안으로 해양 미생물에 기초한 신재생에너지 개발이 해결방법으로 떠오르고 있다. 정부의 제3차 신 재생에너지 기술개발 및 이용 보급 계획에 근거하여, 2030년까지 바이오에너지 부분의 50%인 500만TOE를 해양 바이오에너지에서 생산하려 한다. 본 연구는 국가 경제에서 해양바이오에너지 개발사업이 국내 경제에 미치는 파급효과에 대하여 산업연관분석을 적용하여 분석하고자 한다. 생산유발, 부가가치 유발, 취업유발에 미치는 효과 및 연구개발 유발효과 4가지를 분석하되, 수요유도형 모형을 적용한 분석 결과를 제시한다. 한국은행 산업연관표 기본부문 기준 403부문 중에서 66개 부문을 해양 바이오에너지 관련 부문이라 정의한 후, 해양바이오에너지 관련 부문을 중심에 놓고 이를 외생화하여 분석한다. 해양바이오에너지 개발사업에 2,234억원의 예산이 투입되면, 생산유발효과 3,123억원, 부가가치 유발효과 865억원, 취업유발효과 1,151명, 연구개발 유발효과 47.8억원으로 분석되었다. 이러한 정량적 정보는 해양바이오에너지 개발사업의 상용화에 대한 정책 결정에 활용될 수 있다.

• STI Policy Review
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• 제6권1호
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• pp.54-69
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• 2015

Although there is progress in developing green sectors in North America and East Asia, the key challenge facing the expansion of economy-wide green innovation and structural change in these regions is the absence of relevant policy follow-up to the green stimulus enacted during the Great Recession. The boost to green sectors provided by such measures is waning quickly, given that much of the green stimulus focused on energy efficiency. The biggest obstacles to sustaining green growth in North America and East Asiaare major market disincentives, especially the under-pricing of fossil fuels and market failures that inhibit green innovation. A three-part strategy to overcome these obstacles would involve: first, removing fossil fuel subsidies; second, employing market-based instruments to further reduce the social costs of fossil fuel use; and third, allocating any resulting revenue to public support for green innovation and investments. Such a strategy would ensure that green growth is not about promoting niche green sectors but instigating economy-wide innovation and structural transformation in North America and East Asia.

• 설비공학논문집
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• 제28권11호
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• pp.434-443
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• 2016

The evaporation of water from an aqueous solution is widely used in the food, desalination, pulp, and chemical industries. Usually, a large amount of energy is consumed in the evaporation process to boil off water due to atmospheric pressure. As a way of improving the energy efficiency of the evaporation process, the combination of multiple effect evaporation and thermal vapor recompression has been proposed and has become a successful technique. In this study, 4 multiple-effect falling film type evaporators for sugar solution are designed and the energy efficiency of the system is analyzed in response to the selection of the steam ejector position. Energy efficiency is increased and vapor is more compressed in the steam ejector as the Thermal Vapor Recompression (TVR) is arranged in the rear part of the evaporator system. A simplified 0-dimensional evaporator model is developed using non-linear equations derived from mass balances, energy balances, and heat transfer equations. Steam economy is calculated to compare the evaporation performance of the 4 proposed evaporators. The entrainment ratio, compression ratio, and expansion ratio are computed to check the ejector performance.

• 한국자동차공학회논문집
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• 제23권2호
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• pp.230-238
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• 2015

The main purpose of this paper is to suggest opportunities for reducing $CO_2$ emission in energy conversion of a vehicle, focused on auxiliary energy improvement in the automotive field. As part of worldwide efforts to curb global warming and to protect the domestic industry as trade barriers, many countries have set goals to regulate greenhouse gas emissions. As an example, new $CO_2$ emission regulation in EU was expected to go into effect strictly in 2020. Therefore, global car-makers need to establish strategic responsiveness of the regulations. This paper shows $CO_2$ economic value by using the correct interpretation of the relevant laws and regulations. The $CO_2$ value analyzed using quantitative figures leads to the possibility of auxiliary(accessories, HVAC, electric apparatus etc.) technology for improving fuel economy. As a result, this study generalizes the meaning of electric power saving for each driving mode by auxiliary energy improvement.

• 한국자동차공학회논문집
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• 제20권2호
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• pp.38-46
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• 2012

This paper discusses the energy consumption for a mid-size electric vehicle(EV) under various conditions. In order to analyze which driving style is more efficient in terms of the system of the EV, we develop the electric vehicle model and apply several types of speed profiles such as different steady speeds, acceleration/deceleration, and a real world driving cycle including the elevation profile obtained from a GPS device. The results show that the energy consumption of the EV is affected by the operating efficiency of components when driving at low speed, while it depends on required power at wheels when driving at high speed. Also this paper investigates the effect of the elevation of a road and the rate of electrical braking on the energy consumption as well as the fuel economy of a conventional vehicle model under the same conditions.

• 한국유기농업학회지
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• 제18권2호
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• pp.135-154
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• 2010

The green craze has hit all the world lately. The green revolution which means immense changes for sustainable development under the new environment-economy system is foretelling that we should have new angle to the environment and economy. This paper is about the development of the model and indicators for construction of ECO(Energy Circulating Organic)-Village which is the green growth option of local community. This model is composed of three concepts - SPDC (about procedural methodology of Model), Virtuous Circle (about functional relationships of three requisites), Network (about spatial relationships between communities) - and evaluation indicators. Environment, tourism, industry (Energy & Organic Agriculture) are set as the three requisites for green growth of local community. Nations of the world plunge into the green war which is silent, general, sweeping changes. We can not win this war with the existing thinking system and policy. We need revolutionary changes reconsidering of environmental value and sustainable development strategy of the region. Each of us should go through the changes and this work would be the one among those efforts.

• 보일러설비
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• 통권61호
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• pp.106-107
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• 1999