• Title/Summary/Keyword: Energy Economy

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A Study about Impact of Battery SOC on Fuel Economy of Conventional Diesel Vehicle (배터리 충전상태가 경유자동차 에너지소비효율에 미치는 영향 연구)

  • Kim, Sungwoo;Kim, Kiho;Ha, Jonghan;Kwon, Seokjoo;Seo, Youngho
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.4
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    • pp.480-486
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    • 2016
  • Manufacturers have been applying several technologies that can improve the fuel economy of their cars. The regulated voltage control(RVC) system, is one of those technologies being used in passenger cars. In RVC, the voltage of an alternator is controlled depending on the electrical load demand or battery SOC, although each manufacturer differs from another in terms of detail. RVC can reduce the load of an alternator by consuming the stored energy of a battery and simultaneously generate energy. In this paper, a diesel passenger car equipped with an RVC system was tested under FTP-75 and HWFET modes to evaluate fuel economy as their initial battery SOC(100, 90, 80 and 60 %). The test results showed that the initial SOC affects fuel economy only under the FTP-75 mode. FTP-75 fuel economy of the 60% SOC was 13.2 % lower than the 100 % SOC. Also, the simultaneous consumption of the two energy sources did not appear in 60 % SOC.

Economic Impacts of Energy Development on Domestic Economy

  • Hojjat, Tahereh Alavi
    • The Journal of Asian Finance, Economics and Business
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    • v.1 no.1
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    • pp.41-45
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    • 2014
  • New technologies and techniques to extract natural gas and gas liquids, as well as petroleum, from shale rock have greatly altered expectations for North America's capacity to produce energy products. As a result of innovations such as hydraulic fracturing, some government, industry, and academic observers have predicted that the United States will soon become energy self-sufficient and possibly become a net exporter of natural gas and petroleum. This paper will cover literature review and measure the potential impacts on economic growth and development. Fracking, renewable energy are just a few of the things that have reshaped the energy picture over the past 20 years, how much it will change in the next 20 years and the impacts on the economy will be discussed.

Study on new type vehicle fuel economy correction formula review according to the applicable (신형식 자동차 적용에 따른 연비 보정식 검토에 관한 연구)

  • Lim, Jaehyuk;Kim, Sungwoo;Lee, Minho;Kim, Kiho
    • Journal of Energy Engineering
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    • v.25 no.4
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    • pp.198-206
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    • 2016
  • Fuel economy label will be used as a national indicator in energy management, leading to the development of car technology manufacturer and plays a role in providing consumer vehicle purchase information. But the government's fuel economy label is continued consumer complaint is different and diminishing fuel economy were introduced by the government to measure the exact fuel economy label than resetting the 5-cycle test method in the US for the domestic vehicle standards. Originally two test mode in order to reduce the impact of the sharp increase in the resources required but methods of calculating a measured result value by driving all of the five test mode a variety of environmental conditions and the running pattern is reflected to the fuel economy label (city( FTP-75 mode), highway(HWFET mode)) and using 5-cycle correction formula for calculating a fuel consumption value and the equivalent value to calculate the result of the 5-cycle test. The compensation was calculated expression 30s, 5-Cycle Test Method of vehicles in 2011 was considered necessary to review the existing 5-cycle correction formula for the New Type car due to the recent rapid development of automotive technology. In this study, recent technology is targeting 14 units New Type car applied over the same test method and the existing check test mode specific fuel economy properties and, as a result of analyzing the corrected expression differences that have already been developed with the existing test vehicle resulting large did not show the difference was found to correction formula also not getting the existing fuel correction expression significant effect on the improvement of the current automobile technology as a maximum error of less than 1.5%.

Analysis of the Electric Energy and Exhaust Heat Energy for the Application of Thermo-Electric Generation in a Gasoline Vehicle (열전발전 적용을 위한 가솔린차량의 전력 및 배기열 에너지 분석 연구)

  • 이영재;표영덕;김강출
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.1
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    • pp.99-105
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    • 2002
  • About 70% of energy input to internal combustion engine is rejected to atmosphere by heat. By utilizing this waste heat, a plenty of energy can be conserved in nationwide. One of possible ways is the thermoelectric generation to utilize engine's waste heat to provide auxiliary electric power. Under th is concept, we have been developing the thermoelectric generation system to replace the alternator by converting the waste heat in the engine's exhaust directly to electricity This system may reduce the shaft horse power of the engine, then improves the vehicle fuel economy and the exhaust emissions. In the present study, the characteristics of the electric energy and exhaust heal energy in city and highway mode driving conditions are analysed by using a gasoline passenger car. These results would be used to determine the optimum design parameters of the thermoelectric generation system.

An Overview of the Development of Botswana's Renewable Energy Policy Framework

  • Maswabi, Mareledi G.;Kim, Kyung Nam
    • Bulletin of the Korea Photovoltaic Society
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    • v.4 no.1
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    • pp.28-34
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    • 2018
  • Botswana is a middle-income developing country in Southern Africa with an economy mainly reliant on mineral resources, particularly diamonds. Other sectors of the economy like energy are trailing behind in this country's development. For a long time, Botswana has been relying on imported energy from her neighboring countries. Due to this great dependence, the country has had little control over sufficiency of energy supply, especially during times of shortages in the neighboring countries. As a result, Botswana came up with a number of initiatives over the years to ensure security of supply and self-sufficiency in the energy sector. However, even with the efforts made, currently Botswana is still not self-sufficient and is facing challenges of energy shortages mainly in the power sector. This paper therefore, seeks to review the various policy instruments that have been adopted in Botswana from 1996 to date, identify challenges that come with them and make recommendations on the identified challenges.

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Assessment of Rice Cultivation in Rural Areas from E3 (Energy, Environment, and Economy) Perspectives (E3(Energy, Environment, and Economy)관점에서의 농촌 바이오매스 평가 - 벼 재배를 중심으로 -)

  • Lee, Jimin;Kim, Taegon;Suh, Kyo
    • Journal of Korean Society of Rural Planning
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    • v.21 no.1
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    • pp.1-8
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    • 2015
  • Population growth and increasing consumption of resources in the process of the industrial development has caused environmental pollution, climate change, and resource exhaustion. Therefore 'sustainable development' has become the important issue for the future. The sustainable development aims at effective resource use, less environmental impacts, and higher social security. Generally the rural area including agricultural fields and forest has various and plentiful natural resources which could make future development sustainable. To develop potential rural resources, the values for energy, environment and economy should be assessed considering the life-cycle of resources. The purposes of this study are to suggest the E3 (Energy, Environment, and Economy) assessment model for rural biomass considering life-cycle of resource and to apply the model to rice, the major agricultural product. As the results of this study, it turned out through E3 assessment that economic gain of rice cultivation is 578,374 won/10a, carbon absorption is $1,530kgCO_2/10a$, carbon emission is $926.65kgCO_2/10a$, and bio-energy potential of by-product is 394,028 kcal/10a. When E3 assessment was applied to by province, the results varied by regions because of the amount of input during cultivation. These results would be useful to realize the rural biomass and design regional resources plan in integrated E3 perspective.

Evaluation of Fuel Economy for a Parallel Hybrid Electric Vehicle

  • Park, Dookhwan;Kim, Hyunsoo
    • Journal of Mechanical Science and Technology
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    • v.16 no.10
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    • pp.1287-1295
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    • 2002
  • In this work, the fuel economy of a parallel hybrid electric vehicle is investigated. A vehicle control algorithm which yields operating points where operational cost of HEV is minimal is suggested. The operational cost of HEV is decided considering both the cost of fossil fuel consumed by an engine and the cost of electricity consumed by an electric motor. A procedure for obtaining the operating points of minimal fuel consumption is introduced. Simulations are carried out for 3 variations of HEV and the results are compared to the fuel economy of a conventional vehicle in order to investigate the effect of hybridization. Simulation results show that HEV with the vehicle control algorithm suggested in this work has a fuel economy 45% better than the conventional vehicle if braking energy is recuperated fully by regeneration and idling of the engine is eliminated. The vehicle modification is also investigated to obtain the target fuel economy set in PNGV program.

Simulation Study on the Fuel Economy of Plug-in Type Hybrid Electric Vehicle (외부충전 방식 하이브리드 전기자동차의 연비 시뮬레이션)

  • 최득환;김현수
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.5
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    • pp.121-128
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    • 2002
  • In this paper, the fuel economy of plug-in type hybrid electric vehicle is investigated through simulation. For the simulation study, 2 shaft type parallel hybrid powertrain is chosen and its operation modes are described. The operation algorithm which yields operation points of minimal fuel cost is suggested. Dynamic model fur operation of HEV and simulation procedure is described. Simulation results of fuel economy is compared to non plug-in type HEV as well as conventional vehicle. With total driving distance of 37km and full usage of 2kwh of electric energy stored in battery pack, plug-in type HEV shows 28-30% improved fuel economy compared to non plug-in type HEV and 86-93% improved fuel economy compared to conventional vehicle.

Effect on the Fuel Economy by Gradient in Automobile Driveway (자동차 전용도로에서 경사가 연비에 미치는 영향)

  • Choi, Seong-Cheol;Oh, Tae-Il
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.7
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    • pp.2925-2930
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    • 2011
  • A vehicle fuel economy is very important issue in the view of fuel cost and environmental regulation. The fuel economy is much improved according to the development of electric, electronic and mechanical technology, but up to now the measurement of it tests the given mode(LA-4, FTP-75, etc) within computer simulation program and engine dynamometer. This fuel economy is different with it of real road. The one of main reason is not considered the gradient of the road. To estimate the effects of fuel economy at highway with gradient in this paper, we measure the amount of fuel consumption and calculate the fuel economy of it with running the Youngdong highway with high gradient. Also this paper analysis and compares the fuel economy with gradient and without gradient when the vehicle runs the same driveway. Then we calculate the total energy created the difference of fuel consumption amount of the two cases and calculate the consumpted energy by tire driving force from the torque and power of engine in the simulation. This paper verifies the relation of the driving force and the total energy by creating the difference of fuel consumption amount. This paper also proposes the method of fuel economy improvement despite of gradient at the result.