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Modeling the Solar Heat Pump with an Energy Storage System
, M.Sc. Thesis Sharif University of Technology ; Samimi , Jalal (Supervisor) ; Vesaghi, Mohammad Ali (Supervisor)
Abstract
Purpose of ongoing thesis is providing a tool for suitable modeling, increase efficiency and decrease construction cost of solar absorption heat pump. At first, the solar absorption heat pump is modeled by the thermodynamic laws. Then, this model is converted to the new standard mathematical programming model using exergy and thermodynamic Analysis with considering all technical and economic constrains. This mathematical model is optimized by Genetic algorithm (GA). Because of the nonlinear objective function and the constraint, GA is used as optimization algorithm. After applying GA, optimized parameters of cycle heat exchanger designing and its electricity consumption are calculated....
Modeling a Solar Refrigerator Powered by Energy Storage System
,
M.Sc. Thesis
Sharif University of Technology
;
Samimi, Jalal
(Supervisor)
;
Vesaghi, Mohamd Ali
(Supervisor)
Abstract
Considering high potential of solar energy and exhaustibility of fossil fuels in Iran, using solar energy seems to be inevitable. But one of the main problems in the application of these systems is high investment and maintenance costs. So, in this thesis, suitable solution is presented for decreasing cost and optimizing of a solar absorption refrigerator based on developed energy model. This system consists of two CPC solar collectors and a thermal energy storage system using phase change materials that provides input energy to the generator of absorption refrigerator. The exergy efficiency of system components is calculated by relations of energy model and exergy analysis. Then...
, M.Sc. Thesis Sharif University of Technology ; Abbaspour Tehrani Fard, Ali (Supervisor) ; Fotuhi Firouzabad, Mahmud (Supervisor)
Abstract
Increasing need to electrical energy, gradual diminishing of fossil fuel resources and environmental pollution due to continuous exploitation of them, have lead to inevitable change of energy sources in power generation. Due to random nature of wind speed, the power output of a wind farm is varied and as a result, it does not have a proper control capability. If the wind power has a major role in system generation, the system could not respond to the fluctuations appropriately. With the increasing penetration of wind power, it affects different aspects of power system such as power quality, system stability, and system reliability. Utilizing energy storage systems (ESS) is a solution to...
Energy Savings in the Urban Electrified Railway using Onboard Storage Systems Energy Savings in the Urban Electrified Railway Using Onboard Storage Systems
, M.Sc. Thesis Sharif University of Technology ; Zolghadri, Mohammad Reza (Supervisor)
Abstract
Given the high rate of energy dissipation in electric urban rail lines, methods of saving energy in these systems have become a topic of interest. The use of energy saving equipment to save the energy wasted in braking (Because of the diode rectifier, thermal energy is usually wasted and is not reversible) can play an important role in reducing the energy loss. The role of energy storage equipment, from other aspects such as voltage regulation and increasing the system reliability is also remarkable. In this thesis, the various possible methods for saving energy in the Metro system are expressed.
The various types of storage devices with increased reuse of braking energy which is the...
The various types of storage devices with increased reuse of braking energy which is the...
Design of a Charging Station for Evs
, M.Sc. Thesis Sharif University of Technology ; 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...
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...
Developing an Optimal Strategy to Manage the Curtailment of Wind Farms Output
, M.Sc. Thesis Sharif University of Technology ; AbbaspourTehrani Fard, Ali (Supervisor) ; Fotuhi-Firuzabad, Mahmud (Co-Advisor)
Abstract
In recent years, due to environmental concerns together with rising costs of the fossil fuels, the wind energy usage in electricity generation of various countries has experienced a growing trend. Owing to inherent characteristics of wind turbines power generation, i.e. uncertainty in their output level as well as being undispatchable, the rapid growth of installed wind farms, however, has caused some new challenges in operation and planning studies of power systems. Among the major challenges in operation of high wind penetrated power systems, wind power curtailment has been emerged as a new problem in wind development. System operator may curtail wind farms output in order to meet system...
Design and Simulation Hybrid Energy Storage Systems for Electric Urban Rail Transport Systems
, M.Sc. Thesis Sharif University of Technology ; Zolghadri, Mohammad Reza (Supervisor)
Abstract
In urban rail transport systems such as subway, Trains are constantly accelerate and brake, so the braking system is of great importance in energy consumption and constitute about 30 to 40 percent of total energy consumption trains, thus retrieval braking energy will lead to significant savings in urban rail transport systems. In this paper, in the beginning, different storage equipments for storage braking energy have been studied and compared and finally Supercapacitors due to technical and economic features have been selected for the storge of equipment. These systems can be implemented in both stationary and onboard. For precise evaluation and select the appropriate storage system, by...
Development of Cement Production Model to Reduce and Capture CO2 Emissions
, M.Sc. Thesis Sharif University of Technology ; Avami, Akram (Supervisor)
Abstract
Energy consumption and pollutions especially carbon dioxide emissions are two of the main challenges in the cement industry. 5-7 percent of world’s carbon dioxide emissions is due to cement production while 900 kg of carbon dioxide is emitted for the production of a tone of cement. The main source of carbon dioxide emissions in a cement plant is the combustion of fuel to provide heating demands and also converting the ore into clinker. Therefore, any improvement in energy efficiency in a cement plant could reduce carbon dioxide emissions resulting from the combustion. Important ways of energy recovery in a cement plant are using the energy recovered from the exhaust gas in the preheater...
Planning of Energy Storage Systems with the Main Goal of Managing the Output Power of Wind Farms
, M.Sc. Thesis Sharif University of Technology ; Ehsan , Mehdi (Supervisor)
Abstract
Uncertain fuel prices and also global climate changes are accompanied by some state initiatives such as renewable portfolio standards (RPS). This has caused a fast growth in the amount of renewable energy installed worldwide especially wind energy over last decades. However, the intrinsic characteristics of wind farms output power, i.e. intermittency and volatility of wind speed along with being non-dispatchable in output generation of wind turbine raises many new technical and financial challenges for power system operators and planners. Up to these issues, large level of wind power penetration causes a growing concern in wind energy curtailment issue which the wind farm’s operator may be...
Energy Storage Systems Operation Strategy in Presence of Wind Farms Based on Consumption Pattern
, M.Sc. Thesis Sharif University of Technology ; Ehsan, Mehdi (Supervisor) ; Fotuhi Firuzabad, Mahmoud (Supervisor)
Abstract
World environmental concerns sharp increase in necessity of using energy in comparison with permanent progress in the field of renewal energy technologies causes modern forms of energy sources which can be used by public. This project studies the increasing influence of the wind power in power systems and also designing and exploiting techniques of local saving energy systems. For this purpose, models and possibilities in order to anticipate the operation of wind farm which is connected to grid by saving energy is described. In this project, the operation of compound system components which is totally a combination of three systems is being studied. The considered compound systems consist of...
Planning Studies of Energy Storage Systems in Distribution Network with the Main Goal of Improving the System’s Resilience
, M.Sc. Thesis Sharif University of Technology ; Fotuhi Firuzabad, Mahmoud (Supervisor) ; Rajabi Ghahnavieh, Abbas (Supervisor)
Abstract
Occurrence of natural disasters such as flood, windstorms, tsunamis and earthquakes has caused striking effects on critical infrastructures like power systems in recent decades. There are some examples of high-impact low-possibility (HILP) events which causes catastrophic effects on power systems. Traditionally, planning and operational studies of power system have been run taking into account some reliability metrics. Although, the reliability indices can represent the ability of a system in confronting with possible failures of components, they are unable to efficiently consider the effects of severe events such as earthquake and other HILP events. Moreover, traditional power systems were...
Developing the Appropriate Framework of Energy Storage Systems’ Participation in Flexible Ramping Market Considering the Improvement of System Reliability
, M.Sc. Thesis Sharif University of Technology ; Fotuhi-Firuzabad, Mahmoud (Supervisor)
Abstract
The penetration of renewable energies in generation section of power systems caused many issues and challenges for planners, operators and decision makers. One significant challenge is the uncertainty and variability of this type of generation, which must be properly covered; otherwise it would lead to wide load and supply curtailments. In this regard, some system operators introduced a new product, named Flexible Ramping Product (FRP) to their markets. FRP is the ramp capability of market participants which is reserved to cover the uncertainty and variability of net load (load minus intermittent supply) at next market time-interval of real-time market. With this in mind, the energy storage...
Use of Thermal Storage for Compressed Air Energy Storage (CAES)
, M.Sc. Thesis Sharif University of Technology ; Rajabi Ghahnavieh, Abbas (Supervisor)
Abstract
One of the issues that today is considered by planners and system operators in power systems, especially the Iranian power grid, is the high variation and the lack of uniformity of load curves in different hours of the day. This has led to the use of all installed capacity of the country's production only in peak hours, and in the low and intermediate times, a large amount of installed capacity is out of the circuit, which means Unused capital. This problem is more or less seen in world power networks with high load variation curves. Also, the production of renewable energies has always been fluctuating, and the production of power control to improve this fluctuation is very important. This...
Controller Placement in SDNs
, M.Sc. Thesis Sharif University of Technology ; Afshin Hemmatyar, Ali Mohammad (Supervisor)
Abstract
Controller placement affects all aspects of separating control plane from forwarding plane in SDN networks such as flow set up delay and reliability. Also it will limit Fault tolerance, and other performance evaluation measures such as propagation delay, accessibility and Convergence in WANs. These measures influence software designing with affecting controllers’ ability to respond to real-time events and push forwarding actions to forwarding elements. The placement problem consists of finding suitable places for controllers along with the number of them. Most of the works in this field try to decrease the delay between controllers to switches and between controllers themselves. Beside,...
Design a Comprehensive Framework for Distribution System Restoration in the Presence of Distributed Generations and Energy Storage Systems
, Ph.D. Dissertation Sharif University of Technology ; Abbaspour Tehrani Fard, Ali (Supervisor) ; Moeini Aghtaie, Moein (Co-Supervisor)
Abstract
This thesis presents a stochastic framework to properly involve the uncertainties associated with demand in distribution system restoration (DSR) problem. The restoration process returns the system back to normal operation after any combination of system components have been lost due to an outage. During restoration, the system operator executes a set of actions that progressively mitigate the outage. These actions aim at minimizing the impact of the outage on the final user without compromising the security and operability of the system. In this framework, dynamic programming (DP) is used to solve DSR problem for a distribution system that accommodates various technologies of DG units and...
Design a Comprehensive Framework for Management of Virtual Power Plant (VPP) Energy Resources in Energy Markets
, M.Sc. Thesis Sharif University of Technology ; Moeini Aghtaie, Moein (Supervisor) ; Fotuhi Firuzabad, Mahmud (Co-Supervisor)
Abstract
A virtual power plant is defined as a set of independent consumers or diverse generating units, flexible loads and storage systems in a specific geographic area. The primary purpose of a virtual power plant is thus to coordinate the production and consumption of its constituent parts with a view to maximizing their performance in energy markets. The components of the virtual power plant that study in this research include microturbines as dispatchable power plants, storage units, solar cells as stochastic generating units, and demand-response. In this regard, first, the main components of the virtual power plant are identified. Then, the mathematical model of each of these components is...
Energy Storage Planning from the Viewpoint of the Electricity Retailer in the Presence of Demand Response Programs
, M.Sc. Thesis Sharif University of Technology ; Ehsan, Mehdi (Supervisor)
Abstract
Electricity has been known as one of the humans’ essential needs. The emergence of a competitive environment in most aspects of humans life and its considerable impact on the economic system in recent years has promoted this idea that the electricity should be traded as a commodity. In this business, the competition has been based on the convenient access for subscribers, and the exclusive electricity environment has became a competitive environment. Therefore, new roles have emerged. These roles take place in the direction of generation, transmission and distribution of electrical energy with the aim of improving them. Retailer is one of the emerged roles for restructuring in the field of...
Optimum Power Dispatch in Wind Farm Considering Energy Storage Systems and Dispatchable Resources
, Ph.D. Dissertation Sharif University of Technology ; Oraee, Hashem (Supervisor)
Abstract
In this dissertation, two parts of research has been conducted. First, with the aim of minizing the fluctuations of power output of wind farms and the need for energy storage system, optimization of wind farm (WF) layout has been studied. Deployment of battery energy storage system (BESS) is a viable option to alleviate the inherent power fluctuation of wind farms. In this thesis and based on the power spectrum density (PSD) theorem, it is hown that the WF layout affects not only the total harvested energy but also the level of power fluctuation, which in turn influences required capacity of battery energy storage system (BESS) needed to mitigate the inherent power fluctuation of the wind...
Latent Heat Energy Vapor Storage in Phase Change Materials in Solar Stills
, M.Sc. Thesis Sharif University of Technology ; Rajabi, Abbas (Supervisor) ; Shafie, Mohammad Behshad (Supervisor)
Abstract
Providing fresh water, ending fossil fuels, using renewable energy and achieving a clean biological environment in different parts of the world especially in Iran beside having access to many saline water sources, Shows the need for research in the field of solar still desalination. The goal of current study is to increase the performance of the solar still system through the use of an energy storage system and an additional condenser. Adding an additional condenser to a conventional solar still lead to an increase in the rate of evaporation and consequently increase the production of the system. Also, by collecting distilled water from the sidewalls, the amount of water produced...
Recycling of Silica from Spent Lead-Acid Battery Separators and Reusing in FSPCM for Thermal Energy Storage
, M.Sc. Thesis Sharif University of Technology ; Pircheraghi, Gholamreza (Supervisor)
Abstract
To reduce material consumption needed in production as well as avoiding thousands of tons of contaminations produced by spent materials in the battery industry, recycling was taken into consideration. In this study silica was recycled from spent lead-acid battery separators by the pyrolysis process. silica along with high-density polyethylene (HDPE), can be used as supporting material for fabricating form-stable phase change materials (FSPCM). FSPCMs are of great ability to be used as thermal energy storage (TES) in different parts of a building e. g. wallboards to reduce energy consumption. In this line, an eutectic mixture of lauric acid, palmitic acid and paraffin with the melting point...