scholarly journals Comprehensive Comparison between Hybrid and Electric Vehicles Using a Multi-Dimensional Techno-Economic Assessment Diagram: Concept and Application

2018 ◽  
Vol 9 (3) ◽  
pp. 41
Author(s):  
Takuya Hara

This paper presents a visualization methodology, in the form of a multi-dimensional techno-economic assessment diagram, to comprehensively illustrate the relationship between assumptions (sets of input parameters) and results (corresponding output variables). This methodology is applied to analyze the lifecycle costs and CO2 emissions of hybrid vehicles (HVs) and electric vehicles (EVs). This paper then develops an eight-dimensional interactive diagram showing the relative advantages of HVs or EVs in the input space consisting of the following parameters: HV fuel efficiency; EV energy efficiency, total mileage travelled gasoline price, electricity price, battery price, gasoline CO2 intensity, and electricity CO2 intensity. This methodology provides a map illustrating the comprehensive relationship between the inputs and outputs in the model used, where specific scenarios (specific sets of inputs and their outputs) are represented by points plotted on the map. This methodology can be used in systematic comparisons of electric vehicles and related uncertainty analyses.

2020 ◽  
Vol 26 ◽  
pp. 1
Author(s):  
Mohammad Mohajer ◽  
Mohsen Gerami

RESUMOO Irã como país em desenvolvimento está enfrentando uma quantidade excessiva de poluição do ar em suas grandes cidades. Parece que usar veículos elétricos / híbridos é uma solução apropriada, mas qual carro será mais compatível com a sociedade, o ambiente e as pessoas do Irã ainda é vago? Para responder a essa pergunta, projetamos nosso modelo no qual os quatro híbridos mais populares mundialmente / A eletricidade foi analisada com base nas idéias de especialistas. Em geral, é utilizado o método analítico-descritivo, a comunidade da pesquisa inclui todos os especialistas no campo da gestão ambiental e o tamanho da amostra é obtido usando o método objetivo não aleatório (10 especialistas foram questionados) para priorizar entre carros diferentes com base em um método processo analítico de hierarquia. Os resultados mostraram que, com base na perspectiva dos especialistas, veículos totalmente elétricos são preferencialmente mais compatíveis com a situação do Irã do que veículos híbridos. A característica mais significativa que é contribuída para os veículos elétricos é o alto nível de eficiência de combustível e a menor quantidade de poluição atribuída ao seu motor elétrico, o que significa que eles não liberarão nenhuma poluição no ar. Finalmente, com base nos resultados, sugerimos algumas estratégias, entre as quais a substituição de veículos a combustível antigos e de baixa eficiência, aplicando impostos excessivos regularmente.Palavras-chave: Veículos Elétricos / Híbridos, Poluição do Ar, Transporte Urbano.USING GREEN VEHICLES AS AN APPROACH TO IMPROVE AIR QUALITY IN IRANIAN METROPOLISESNowadays due to the overwhelming levels of pollution, especially in large cities, going green, which means products have higher levels of energy consumption efficiency, is one of the crucial features of any product. In fact being green for vehicles which are responsible for majority of air pollution is significant, therefore companies are trying to product more environment-friendly cars and governments are more intended to place more environmental standards on this industry. Iran as a developing country is facing excessive amount of air pollution in its big cities and it is necessary for this country to invest on more environmental products, especially in transportation system which release a numerous level of air and noise pollution into the environment. It seems, it will be an appropriate approach for this country to produce or import Electric/Hybrid vehicles, but which car will be more compatible with Iran’s society, environment and people situation is still vague, in order of answering this question we designed our model in which 4 most globally popular Hybrid/Electric has been analyzed based on experts’ ideas. In general, descriptive-analytic method is used, the survey community is included all experts in the field of environmental management and sample size is obtained using non-random objective method (10 experts have been questioned) for prioritizing between different cars based on an analytic hierarchy process. The results showed that based on the experts’ perspective, fully electric vehicles are would rather be more compatible with Iran’s situation than Hybrid ones. The most significant feature that is contributed to Electric vehicles is about their high level of fuel efficiency and the least amount of pollution attributed to their Electric engine, which means they will release no pollution into the air. We finally based on the results, suggested some strategies, among which replacing old and low efficient fuel vehicles, placing excessive tax on regular cars and Tax exemption(for driving, importing and manufacturing electric cars) are the practical approaches for government in order to engage people buying-using more efficient cars. Keywords: Electric / Hybrid Vehicles, Air Pollution, Urban Transportation


Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 2094 ◽  
Author(s):  
Shoki Kosai ◽  
Muku Yuasa ◽  
Eiji Yamasue

Interests in evaluating lifecycle energy use in urban transport have been growing as a research topic. Various studies have evaluated the relationship between the intracity transport energy use and population density and commonly identified its negative correlation. However, a diachronic transition in an individual city has yet to be fully analyzed. As such, this study employed transport energy intensity widely used for evaluating transport energy efficiency and obtained the transport energy intensity for each transportation means including walk, bicycle, automobile (conventional vehicles, electric vehicles, hybrid vehicles, and fuel cell vehicles), bus and electric train by considering the lifecycle energy consumption. Then, the intracity lifecycle transport energy intensity of 38 cities in Japan in 1987–2015 was computed, assuming that the cause of diachronic transition of intracity transport energy efficiency is the modal shifting and electricity mix change. As a result, the greater level of population density was associated with the lower intracity transport energy intensity in Japanese cities. The negative slope of its regression line increased over time since the intracity lifecycle transport energy intensity in cities with low population density continuously increased without any significant change of population density. Finally, this study discussed the strategic implications particularly in regional areas to improve the intracity lifecycle transport energy efficiency.


2021 ◽  
pp. 36-44
Author(s):  
Mikhail Podrigalo ◽  
Dmytro Abramov ◽  
Yurii Tarasov ◽  
Mykhailo Kholodov ◽  
Ruslan Kaydalov ◽  
...  

Problem. There was a need to expand the well-known concept of vehicle operational properties – fuel efficiency arose in connection with the advent of new alternative power plants (electric motors, flywheel engines, hybrid power plants, etc.), which requires the inclusion of not only the thermal energy of the fuel, but also other types of energy (electrical and mechanical). In the paper the research of choice and justification of the vehicle energy efficiency indicators by assessing the energy costs of the engine for its movement was made. The analysis of the relationship between energy characteristics of dynamics and vehicle efficiency was made. Goal. The aim of the study is to analyze methods for assessing the vehicle energy efficiency. To achieve this goal, it is necessary to determine indicators that will allow a comparative analysis of energy efficiency indicators of various vehicles. Methodology. The approaches taken in the work to solve this goal are based on substantiating the indicators of the energy efficiency of the car by assessing the energy consumption of the engine for its movement. Results. In our opinion, in projecting and evaluating the dynamic properties of vehicles, it is rational to use the energy indicators of the vehicle, for which it is necessary to develop appropriate assessment criteria. Analysis of the results of indicators calculation and, in table 1, has shown that the indicator in comparison with has less dispersion. Originality. The obtained results of the influence of the parameters of vehicles on the level of their energy load shows that the indicator has less dispersion than. In addition, the value does not correlate with the year of manufacture of the vehicle, which allows the use of this indicator at the design stage of vehicles. It is only necessary to set the rational normative value of this indicator. Practical value. The results obtained can be recommended to specialists for use in the design, production, certification and operation of automotive vehicles, vehicle energy efficiency, combined power plant.


Author(s):  
Robert Ian Taylor

The motivations for the move to electrified vehicles are discussed with reference to their improved energy efficiency, their potential for lower CO2 emissions (if the electricity system is decarbonized), their lower (or zero) NOx/particulate matter (PM) tailpipe emissions, and the lower overall costs for owners. Some of the assumptions made in life-cycle CO2 emissions calculations are discussed and the effect of these assumptions on the CO2 benefits of electric vehicles are made clear. A number of new tribological challenges have emerged, particularly for hybrid vehicles that have both a conventional internal combustion engine and a battery, such as the need to protect against the much greater number of stop-starts that the engine will have during its lifetime. In addition, new lubricants are required for electric vehicle transmissions systems. Although full battery electric vehicles (BEVs) will not require engine oils (as there is no engine) they will require a system to cool the batteries – alternative cooling systems are discussed, and where these are fluid based, the specific fluid requirements are outlined.


Lubricants ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 66
Author(s):  
Robert Ian Taylor

The motivations for the move to electrified vehicles are discussed with reference to their improved energy efficiency, their potential for lower CO2 emissions (if the electricity system is decarbonized), their lower (or zero) NOx/particulate matter (PM) tailpipe emissions, and the lower overall costs for owners. Some of the assumptions made in life-cycle CO2 emissions calculations are discussed and the effect of these assumptions on the CO2 benefits of electric vehicles are made clear. A number of new tribological challenges have emerged, particularly for hybrid vehicles that have both a conventional internal combustion engine and a battery, such as the need to protect against the much greater number of stop-starts that the engine will have during its lifetime. In addition, new lubricants are required for electric vehicle transmissions systems. Although full battery electric vehicles (BEVs) will not require engine oils (as there is no engine), they will require a system to cool the batteries—alternative cooling systems are discussed, and where these are fluid-based, the specific fluid requirements are outlined.


2021 ◽  
Vol 11 (8) ◽  
pp. 3555
Author(s):  
Chien-Hsiung Chen ◽  
Zhongzhen Lin

In the present era, technology is developing rapidly. Smartphones play a significant part in people’s lives. However, the research on smartphones mainly focuses on the area of technological realization. The purposes of this study were to examine the relationship between the various rear cameras in smartphones and consumer perceptions, and to understand consumers’ purchasing intentions and preferences. Through the methods of multidimensional scaling (MDS), factor analysis and triangular fuzzy numbers, the visual images of the smartphone rear cameras were analyzed and discussed. The results indicate that the visual images taken by different shapes of rear camera are quite distinct in the categories of innovative and fashionable, and simple and pure, but less distinct in the categories of harmonious and ordered, premium and technical, and superior and valuable. Through a comprehensive comparison, four groups whose images were similar were created. The outcome effectively reflects the potential consumer demands for smartphone rear camera patterns, providing insights for design practices in the smartphone industry.


2021 ◽  
Vol 11 (13) ◽  
pp. 6005
Author(s):  
Daniel Villanueva ◽  
Moisés Cordeiro-Costas ◽  
Andrés E. Feijóo-Lorenzo ◽  
Antonio Fernández-Otero ◽  
Edelmiro Miguez-García

The aim of this paper is to shed light on the question regarding whether the integration of an electric battery as a part of a domestic installation may increase its energy efficiency in comparison with a conventional case. When a battery is included in such an installation, two types of electrical conversion must be considered, i.e., AC/DC and DC/AC, and hence the corresponding losses due to these converters must not be forgotten when performing the analysis. The efficiency of the whole system can be increased if one of the mentioned converters is avoided or simply when its dimensioning is reduced. Possible ways to achieve this goal can be: to use electric vehicles as DC suppliers, the use of as many DC home devices as possible, and LED lighting or charging devices based on renewables. With all this in mind, several scenarios are proposed here in order to have a look at all possibilities concerning AC and DC powering. With the aim of checking these scenarios using real data, a case study is analyzed by operating with electricity consumption mean values.


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