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    Heat transfer enhancement in annular flow with outer grooved cylinder and rotating inner cylinder: review and experiments

    , Article Applied Thermal Engineering ; Volume 120 , 2017 , Pages 257-268 ; 13594311 (ISSN) Nouri Borujerdi, A ; Nakhchi, M. E ; Sharif University of Technology
    Abstract
    This experimental work is an attempt to identify the most significant parameters influencing heat transfer enhancement in annular flow with outer grooved cylinder and rotating inner cylinder. This type of flow known as Taylor-Couette flow has many industrial applications such as electrical power generators and rotating machineries. A comprehensive review of the previous works on flow regimes, heat transfer and pressure drop in grooved channels is provided. The experiments are conducted based on four different factors including Taylor number, 0

    Design of a Charging Station for Evs

    , M.Sc. Thesis Sharif University of Technology Negarestani, Soodeh (Author) ; Rajabi Ghahnavieh, Abbas (Supervisor) ; Fotuhi Firuzabad, Mahmud (Co-Advisor)
    Abstract
    Mass production of Plug-in Hybrid Electric Vehicle (PHEV) and requests for long trip capability necessisated development of fast charging station that can charge PHEV in a feuling time of a conventional vehicle. Fast charging station design requires a systematic approach to consider various related issues.
    The aim of this thesis is to design a fast charging station. First, the daly demand for PHEV charging is modeled considering number and type of PHEV as well as level and pattern of daily driving of PHEV. Uncertainty in daily driving and in PHEV state of charge in the start of charging are also considered in modeling charging demand. An approach, then, is proposed for optimal design of... 

    Comparison, Analysis and Simulation of Different Electrical Machines and Proposing the Most Appropriate one Regarding their Applicability in Hybrid Electrical Vehicles

    , M.Sc. Thesis Sharif University of Technology Sharifan, Shahriar (Author) ; Oraee Mirzamani, Hashem (Supervisor)
    Abstract
    Constantly rising fossil fuel consumption and the resulting air pollutants have caused hybrid electric vehicles to be considered as the most efficient mid-term solution for decreasing problems resulting from environmental pollutions and rising fuel prices. Various types of hybrid electric vehicles and power transmission schemes are studied in this thesis. Electric motors utilized in electric vehicles and hybrid electric vehicles such as induction motor, brushless permanent magnet motor, DC motor and switched reluctance motors are investigated based on previous studies and researches, and are compared for all basic criteria. For completing the comparison procedure and selecting the most... 

    Designing Torque Contribution Decision- Making unit for Hybrid Vehicles using Fuzzy Logic

    , M.Sc. Thesis Sharif University of Technology Ahmadpour, Alireza (Author) ; Bagheri shouraki, Saeed (Supervisor) ; Khayyat, Ali Akbar (Supervisor)
    Abstract
    Energy management in vehicles is ann important issue, because it can significantly influence the performance of the vehicles and component sizing., Although the bbatteries have been widely used in electric vehicles (EVs), However the large current impact of battery cycle life is still a difficult problem that remains to be resolved and because of that, Hybrid Electric Vehicles (HEVs) areis the way that allows to to achievinge the advantages of both engines.Hybrid cars uses both an electric motor and internal combustion engine (ICE) used together, so, itwhich can benefit from the advantages of both engine types. ImprovImprovement ofing energy management in (HEVs) can providedeliver important... 

    Optimization of Size and Operation of Energy Hub Considering Uncertainty

    , M.Sc. Thesis Sharif University of Technology karvani, Mohsen (Author) ; Ranjbar, Ali Mohammad (Supervisor)
    Abstract
    Nowadays the growing demand for energy, and, on the other hand, the limited resources of fossil consuming energy in the world have caused the energy operation and consumption management to be taken into consideration much more than the past. Based on this background, improving the efficiency of feed conversion technologies in supplying the energy demanded by the consumers is the foremost and the most crucial solution to preventing energy loss. Another approach to reducing the losses through energy generation and transmission is the use of distributed energy generation systems in small scale. The advantages of applying this type of technology are the possibility of installing near the load... 

    Operation of Microgrid with Electric Vehicles Management as Energy Storage Unit

    , M.Sc. Thesis Sharif University of Technology Hassanzadeh, Mohammad Mahdi (Author) ; Hosseini, Hamid (Supervisor)
    Abstract
    Microgrids will be key components of future smart grids that integrate distributed generation energy with local loads and units for greater efficiency. However, the uncertainty and intermittent nature of renewable energy products prevent the reliable operation of the micro-grids. On the other hand, the introduction of electric vehicles into the transportation industry can be both a challenge and an opportunity for the power grid. Using electric vehicle batteries as an energy storage system is a new work in the smart grid environment. Using an electric vehicle battery as a storage system makes it possible to create a grid with a lower operating cost because of the development of renewable... 

    Modified Load Scheduling Using Smart Meters

    , M.Sc. Thesis Sharif University of Technology Bahrami, Shahab (Author) ; Parniani, Mostafa (Supervisor)
    Abstract
    Implementation of various incentive-based demand response strategies has great potential to decrease peak load growth and customer electricity bill cost. Using advanced metering and automatic demand management makes it possible to optimize energy consumption, to reduce grid loss, and to release generation capacities for the sake of providing sustainable electricity supply, and reducing electricity bills for the customers. With these objectives, this thesis examines the previously suggested load scheduling programs in both residential and industrial sectors, and proposes new practical strategies for load management. This thesis has mainly focuses on three subdivisions of load management... 

    , M.Sc. Thesis Sharif University of Technology Mardiha, Milad (Author) ; Vakilian, Mehdi (Supervisor) ; Fardmanesh, Mehdi (Supervisor)

    Microstructural investigation of semisolid aluminum a356 alloy prepared by the combination of electromagnetic stirring and gas induction

    , Article 15th International conference on Semi-Solid Processing of Alloys and Composites, S2P 2018, 22 October 2018 through 24 October 2018 ; Volume 285 SSP , 2019 , Pages 290-295 ; 16629779 (ISSN); 9783035713732 (ISBN) Nafari, N ; Yekani, F ; Aashuri, H ; Sharif University of Technology
    Trans Tech Publications Ltd  2019
    Abstract
    A three phase electromagnetic stirrer was used to agitate aluminum A356 slurry and a dry and oxygen free argon gas was introduced in to the slurry by a porous graphite core at a same time. The prepared semi-solid slurry was then transferred into a metallic mold and was compacted by a drop weight. Results demonstrated a favorable increase in shape factor, decrease in aspect ratio and average diameter size at different intensities of stirring. The intensity of stirring was changed by altering the current passed through the magnetic coil and also bubbling intensity via the porous graphite diffuser. Different time intervals for electromagnetic stirring and gas induction were applied. Agitating... 

    Study,Simulation and Design of Soft Switching Converters for Electric Vehicle Chargers and Proposing the Most Appropriate Structure Equipped With PFC Rectifiers

    , M.Sc. Thesis Sharif University of Technology Ebrahimi, Milad (Author) ; Oraee Mirzamani, Hashem (Supervisor) ; Tahami, Farzad (Supervisor)
    Abstract
    Constantly rising fuel prices and environmental consciousness have caused alternative transport solutions to be considered.Recently, batteries and electric vehicle industries have developed to become a reasonable alternative for gasoline powered cars. Plug-In hybrid electric vehicles could be connected to the electrical grid to be recharged. To ease the charging process, one solution could use an on-board charger to charge the electric vehicle. This charger should be able to be connected to a conventional outlet for convenience reasons and moreover, it should be a grid friendly charger in order not to pollute the electrical network. After studying the introduced structures for electric... 

    Evaluation the Effect of Thermo-Mechanical Parameters on Microstructure and Texture of Electrical Steel for Improving Magnetic Permeability

    , M.Sc. Thesis Sharif University of Technology Ahmadian, Peyman (Author) ; Akbarzadeh, Abbas (Supervisor)
    Abstract
    Dependence of some magnetic properties such as core loss and permeability on temper rolling was studied in this thesis. It is shown that with a proper temper rolling sharper textures are obtained in the electrical steel and the magnetic properties in the longitudinal and traverse directions are improved. By texture analysis, it is shown that because of temper rolling, shear strain on the surface of the sheet is the main factor for abnormal grain growth and shear texture formation on the surface. The result of formation of this texture is enhancement of the {100} intensity and reduction of the {111} intensity, leading to the improvement of the permeability. Temper rolling is always... 

    A Trip-Chain Based Traffic Assignment Model of Electric Vehicles

    , M.Sc. Thesis Sharif University of Technology Tarighati Tabesh, Mahmood (Author) ; Zokaei Aashtiani, Hedayat (Supervisor)
    Abstract
    The goal of this research is to solve the traffic assignment of electric vehicles with considering trip chains. Limited driving range of electric vehicles is considered as one the most important obstacles for the development of these cars. The worry that the battery will run out of power before the destination is an important issue regarding the electric cars and people usually experience it more in trip chains. In this research, a complementary model and a linearization method is used for traffic assignment. In determining shortest paths in the traffic assignment, in addition to considering the travel time and the distance limit, the constraint of passing through activity nodes is... 

    Problem Solving of Gasoline and Electric Vehicles Traffic Assignment with Variable Demand

    , M.Sc. Thesis Sharif University of Technology Davazdah Emami, Behnam (Author) ; Zakaei Aashtiani, Hedayat (Supervisor)
    Abstract
    During the past decade the ever increasing volume of greenhouse gases due to fossil fuels consumption have made humans to seek for alternative, non-polluting fuels as an effective strategy to reduce pollution and prevent environmental issues thereof. Electric cars are today known as one of the most effective solutions for this purpose. Of course, transition from gasoline-powered cars to electric cars in a wide scale is not technically possible in short term due to technological and infrastructural limitations. As a result, this lengthy process would lead to emergence of a combinational transportation system including both gas and electric-powered vehicles. The major differences between these... 

    Optimized Utilization of Electric Vehicles based on Cost Analysis- the point of view of Energy Policy

    , M.Sc. Thesis Sharif University of Technology Mirahmadi, Fereshteh (Author) ; Fotuhi Firouzabad, Mahmud (Supervisor) ; Rajabi Qahnuyeh, Abbas ($item.subfieldsMap.e)
    Abstract
    This thesis represents a comprehensive view of electric vehicles from the macroeconomic policy in the energy sector perspective. In fact, in this thesis all the efficient factors in the presence of electric vehicles in the transport sector have been completely proceed. Environmental, economic, social and political factors, power grids and infrastructure are considered as the impressive factors. In order to check all factors comprehensively, Systems thinking based on dynamic system method is used. The causal relationships between all the variables which are involved in the presence of electric vehicles and related models to this thesis are simulated in VENSIM software. To investigate this... 

    Enhancement of Electric Energy Distribution System Performance in the Presence of Electric Vehicles as Mobile Energy Storage Devices

    , M.Sc. Thesis Sharif University of Technology Haji Abolhassani, Milad (Author) ; Safdarian, Amir (Supervisor)
    Abstract

    The worldwide increase in greenhouse gases is one of the most important human concerns today, and reducing emissions is on the agenda of politicians and the international community. Globally, the transportation fleet is one of the major sources of environmental pollutants due to the use of fossil fuels, and replacing this fleet with electric vehicles will play an important role in reducing the emission of environmental pollutants. These environmental concerns and the advancement of technologies used in electric vehicles in recent years have led to a relative increase in the presence of electric vehicles in the transportation network. The acceptance of these cars, on the one hand,... 

    Managing VPPs to Aggregate Distributed Energy Resources in Distribution Systems

    , Ph.D. Dissertation Sharif University of Technology Alahyari, Arman (Author) ; Ehsan, Mehdi (Supervisor)
    Abstract
    The fast growth of technologies, most of which depend on natural sources of energy, has resulted in colossal fossil fuel consumption. In this regard, many solutions have been suggested to alleviate the side effects such as air pollution and global warming. Among these solutions, mobile storages like electric vehicles (EVs) and renewable generations have grown significantly due to being more applicable. The uncoordinated operation and uncertain nature of these distributed energy resources (DERs) can bring forward new challenges and issues to the power system operators. Thus, in many cases, it is more efficient to co-operate them in a hybrid system. In this thesis, we address a virtual power plant... 

    An Optimization Model for Shared Electric Vehicle Routing Problem in Urban Trips

    , M.Sc. Thesis Sharif University of Technology Safari Taherkhani, Mohammad (Author) ; Shafahi, Yousef (Supervisor)
    Abstract
    In today’s world, people’s tendency to use their own vehicles is relatively high since private cars provide more convenience, better safety, and better time management than public transportation, but cause more traffic in the streets. Ride-sharing is one of the management tools that has attracted a lot of attention in recent years to mitigate the traffic congestion. Also, electric vehicles are used for public transportation in many parts of the world to achieve a sustainable environment. In this study, we assume that passengers’ origin, destination, and preferred time windows for pick-up and drop-off are known in advance. The aim of the study is to determine the sequence of visiting travel... 

    The Assessment of Cyber_Attacks on Electric Vehicles Charging by a Microgrid (Bus and Personal Vehicle)and Examining the Relevant Consequences in the Power Distribution Grid

    , M.Sc. Thesis Sharif University of Technology Akbarian, Amir Hossein (Author) ; Vakilian, Mehdi (Supervisor)
    Abstract
    Todays, thanks to the positive effects of electric vehicles, (against the vehicles which use patrol as their fuel), reduction of the Earth temperature and its climate change; the manufacturing, sale and use of electric vehicles experience a sharp increase. In addition to decreasing the air pollution, due to their abundant smart implications, they have been dramatically propagated. Massive use of these devices has raised the concern about the loss of the security which is indispensable part of the infrastructure. None of the past publications and works have taken the cyber-attack on the charging price rate and other data into account. In this thesis, charging methods of electric vehicles are... 

    Dynamic Optimization Model for Electric Vehcile Routing in Ridesharing

    , M.Sc. Thesis Sharif University of Technology Elmi, Amir (Author) ; Shafahi, Yousef (Supervisor)
    Abstract
    In the past few decades, a considerable number of researches is devoted to study different challenges of ridesharing systems. Thus, this paper presents a mathematical optimization model to find the exact solution of the dynamic dial-a-ride problem with a fleet of electric autonomous vehicles and charging stations. Furthermore, time windows at which model strives to serve trip requests, are defined over origin and destination of passengers. Contrary to many previous works, charging behavior of vehicle battery at charging station is modeled to follow the actual nonlinear function in real world. In addition, vehicles are able to charge the battery whether fully or partially, whichever is more... 

    An Optimization Model for the Time-Dependent Electric Vehicles Routing Problem in Shared Travel

    , M.Sc. Thesis Sharif University of Technology Yazdiani, Alireza (Author) ; Shafahi, Yousef (Supervisor)
    Abstract
    People are increasingly using private vehicles as a result of the ever-increasing population growth worldwide and the increasing number of travel requests through the transportation network. There are many problems associated with the use of private vehicles on the transportation network, including traffic congestion and air pollution. To address the existing demand, decision-makers have always sought effective modes to respond to the existing situation. For passengers, the proposed modes of transportation should offer the same level of convenience and affordability as a private vehicle. In recent years, shared mobility has become increasingly popular. This mode of transportation has...