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Optimization of Inlet Air Cooling Gas Turbine in Hot and Humid Area
, M.Sc. Thesis Sharif University of Technology ; Sadrhosseini, Hani (Supervisor) ; Zabihollah, Abolghasem (Co-Advisor)
Abstract
Nowadays, gas turbines are from the most widely used devices in terms of power generation. According to their vital role in suppling electrical power required for daily life and their widespread application in power plants, tremendous efforts have been made to improve the efficiency of gas turbine working cycle. One of the most applicable methods to optimize a gas turbine is to cool the compressor inlet air. Applying an absorption chiller is a wisely technique especially when it comes to hot and humid weather condition. In this thesis, effects of applying an absorption chiller with specified technical facts on the performance of gas turbines, which are now functional in Kish Island power...
Reliability and Life Assessment of Gas Turbine Blades Using Modal Analysis
, M.Sc. Thesis Sharif University of Technology ; Zabihollah, Abolghasem (Supervisor) ; Behzad, Mehdi ($item.subfieldsMap.e)
Abstract
Rotary machines including gas turbines have been widely used in many industries like gas reducing pressure stations and power plants. Blades are important components of gas turbines which are subjected to failure due to different kind of damages like crack occurrence. There are various reasons for crack occurrence and its propagation in blades. Presence of crack in the blades may lead to major failure, which in turn, result in emergency shutdown of the system. Therefore condition monitoring is employed to check the possibility of failures. In recent years, condition monitoring techniques have been developed to prevent unnecessary shutdown of the systems. The present thesis aims to...
Crack Propagation Monitoring of Gas Turbine Blades Using Modal Analysis
, M.Sc. Thesis Sharif University of Technology ; Zabihollah, Abolghasem (Supervisor) ; Behzad, Mehdi (Co-Advisor)
Abstract
Rotary equipment are being used in many industries over a wide range of applications, such as gas turbine. Due to the nature of the operating conditions, gas turbines are subjected to variety of damages especially crack propagation of a blade. The Cracks propagation may lead to catastrophic failure during operation. Therefore, detection of the crack presence and its propagation is very important and may reduce possible significant cost of the whole system failure. The thesis aims to investigate the cracks presence and their propagation effects on vibration of a turbine blade which is located at the National Iranian South Oilfields. First, theoretical study is calculated to validate an...
Analysis of Blades Surface Effect on Wind Turbine Performance
, M.Sc. Thesis Sharif University of Technology ; Sadr Hosseini, Hani (Supervisor) ; Sabzehparvar, Mahdi (Supervisor)
Abstract
The development of wind turbine blades model that accurately predict wind turbine thrust in a full range of applicable wind speed has provided a powerful and reliable source for simulation of horizontal axis wind turbine power and thrust force that serves as a valuable tool for wind turbine design and performance analysis. A single-element blade model that reduces the rotor blade characteristics to a lift and drag coefficient vs. angle-of-attack formulation was found to describe accurately the rotor characteristics over a wide operating range. Measurements of wind speed and altitude of wind turbine installation location, rotor speed, and provided thrust is within less than 2% over a wide...
An Innovative Method to Monitor Power Production Performance of Wind Farms Using Web-GIS Technique
, M.Sc. Thesis Sharif University of Technology ; Abbaspour, Madjid (Supervisor) ; Mehdigholi, Hamid (Co-Advisor)
Abstract
Nowadays because of population growth and limitation of fossil fuels for power generation purpose, utilization of renewable energy sources has become highlighted. According to the geographical situation for use of wind energy, since some areas of Iran are in suitable conditions the manufacture of wind turbines and installation in wind farms has been under development recently. Monitoring the performance and operation of turbines and wind farms is an inevitable matter. Because of the suitable geographical location of Iran and pursuant to fair wind potential sites widespread this country, this phenomenon requires some backgrounds in many aspects to be achieved. One of the most important...
Numerical Study on Improvement of Performance of Savonius Wind Turbine with Curtaining
, M.Sc. Thesis Sharif University of Technology ; Shamloo, Amir (Supervisor) ; Sadrhosseini, Hani (Supervisor)
Abstract
In this study, the performance of an existing Savonius turbine has been improved through designing a curved curtain, the curtain has been placed in front of the rotor. To do so, the main purpose is to increase the net static torque of wind rotor via a newly designed curtain. A new guide vane is designed to prevent negative torque produced by convex surface of wind rotor and increasing wind velocity which is impacted concave side of wind turbine rotor blade. The numerical modeling of flow field is verified by experimental result for wind rotor without straightener. The numerical code verification accomplished at three different angle of rotation which the biggest difference between...
Unsteady Aerodynamic Simulation of Horizontal Axis Wind Turbine (HAWT)
, M.Sc. Thesis Sharif University of Technology ; Abbaspour, Madjid (Supervisor) ; Soltani, Mohamad Reza (Co-Advisor)
Abstract
The ultimate aim of this research is optimizing high- performance Horizontal Axis Wind Turbine (HAWT) associated with using Computational fluid dynamics (CFD) to predict the flow behavior over wind turbine blades. Computational prediction of the flow over wind turbines is a challenging numerical problem because of the complicated aerodynamics and large variation in length scales. Phenomena such as; the unsteady flow, vortex shedding of the blade tips, flow separation, complicated blade geometry due to variable twist and chord and changes in angle of attack, and highly turbulent flow over blade sections makes CFD prediction challenging, as well as interesting. The goal is to gain an in depth...
Condition Monitoring of Wind Turbine Blade Using Fiber Optics
, M.Sc. Thesis Sharif University of Technology ; Zabihollah, Abolghasem (Supervisor) ; Behzad, Mehdi (Co-Advisor)
Abstract
Over the last decades the attention of the most modern countries about usage of wind has grown due to the recent crisis of energy. This renewable energy source offers a cost effective solution for electricity production. Wind energy is the best candidate among other sources due to wind turbines technology reliability. In order to gain maximum power from wind turbines, their size becomes relatively large, which creates more complexity in their repair and maintenance, furthermore Wind turbine downtime is outside the expectations, which is more costly than corrective maintenance, therefore in order to minimize sudden downtimes and related huge maintenance, a reliable monitoring technique must...
Utilization of Airborne Wind Energy in Iran
, M.Sc. Thesis Sharif University of Technology ; Vesaghi, Mohammad Ali (Supervisor) ; Soltani, Mohammad Reza (Supervisor)
Abstract
A Flying Electric Generator (FEG) can be a wind turbine which operates at high altitudes, where there is a continuous fast flow of air and converts wind energy to electrical power.The related field is an interdisciplinary area and is mostly related to the Aerospace Engineering and Energy Conversion. We focused on Iran, as one of the few lands in the northern hemisphere that has a high overall amount of high altitude wind energy for at least half of the year over it, according to the information of atlas of airborne wind energy in this work.So to install the FEGs in Iran, we had to find, places with a safe aerial space overhead which grant us reliable spots over country. These places found by...
Hardware Implementation of Fuzzy Logic for Turbojet Engine Fuel Control System
, M.Sc. Thesis Sharif University of Technology ; Montazeri, Morteza (Supervisor) ; Kazemzadeh Hannani, Siamak (Co-Advisor)
Abstract
Gas turbine engine control is a demanding task that requires the regulation of the thrust as well as the satisfaction of the limitations such as engine aerodynamic instability, over temperature and over speed. Fuzzy logic is an attractive technique for the control of poor understood unmodeled, or complex systems especially where the experience of human operators is available to provide qualitative rules. In such cases, it has been found that control decisions can be made on the basis of linguistic measures or fuzzy algorithms. The controller that is designed on the basis of this theory is called fuzzy logic controller. The main objective of this thesis is hardware implementation of fuzzy...
Sustainability Assessment Framework of Co-generation Systems in Tile Industries (Wet route)
, M.Sc. Thesis Sharif University of Technology ; Houshmand, Mahmoud (Supervisor) ; Fatahi Valilai, Omid (Co-Supervisor)
Abstract
There is a growing potential for the use of micro-cogeneration systems in the residential sector because they have the ability to produce both useful thermal energy and electricity from a single source of fuel such as oil or natural gas. Benefits of cogeneration system will cover around 25% of internal electricity needs of ceramic, around 30 % saving in global fuel consumption, reduction of carbon dioxide. In tile factories, there is a system called a spray dryer. This system can use hot air to produce the soil needed to produce ceramic tiles. This hot air is supplied by a very large burner. In developed countries, instead of a burner, a gas turbine is used to produce hot air, with the...
Dynamic System Optimal Design Model: Designing and Evaluation of Turboexpander System Operation
, Ph.D. Dissertation Sharif University of Technology ; Saboohi, Yadoolah (Supervisor)
Abstract
According to Iran’s energy policies, the natural gas transmission pipeline has expanded significantly over the last decade. Moreover, improving energy efficiency is known as a key strategy in energy policies and programs. Therefore, the need for expansion and development of the rational use of energy has received more and more attention. The use of technologies aimed at energy recovery will be an effective step in this regard. Pressure regulators are most commonly used to reduce this pressure in Iran as one of the significant sources of exergy destruction in Iranian gas transmission system. The turbo-expander system is a kind of technology applied in gas pressure reduction stations to...
Optimal Design of Induction MHD Generator for Electrical Power Generation from Exhaust of the Gas Turbine Power Plants
, M.Sc. Thesis Sharif University of Technology ; Boroushaki, Mehrdad (Supervisor)
Abstract
Today, due to increasing electricity consumption and demand, the use of conventional systems such as thermal, hydro and nuclear power plants is not enough to convert energy. Over the past century, scientists have sought to discover new technologies for exploiting different forms of energy and converting them into high-efficiency electrical energy. One of these ways is to use the phenomenon of magnetohydrodynamics (magnetic fluid dynamics) to convert thermal energy directly into electrical energy. Magnetohydrodynamics is a theoretical field that studies the dynamics of fluids with electrical conductivity. Induction magneto-hydrodynamic generators use ionized hot plasma (a quasi-neutral gas of...
Optimal Design of Permanent Magnet Vernier Generator for Wind Power Plants Application
, M.Sc. Thesis Sharif University of Technology ; Boroushaki, Mehrdad (Supervisor)
Abstract
In recent decades, renewable energy resources (especially wind power as the fastest-growing energy source) have increasingly been employed for providing electrical energy all over the world given to the rising energy demands, reduction in non-renewable fossil fuels as well as severe restrictions applied to the utilization of these fuels because of their contribution in environmental pollution, generating greenhouse gas emissions, and consequently earth warming. The main factors in the development of wind energy systems to date are the easy access to this energy source in all seasons and its cost-effectiveness compared to other counterparts. One of the key components utilized for converting...
Baseline Design of the Exergy Recovery and Solar Heating System at the Gas Pressure Reduction Station and its Technical, Economical, and Environmental Assessments
, M.Sc. Thesis Sharif University of Technology ; Saboohi, Yadollah (Supervisor)
Abstract
As producing and consuming of natural gas has increased in recent years, improving natural gas distribution and transfer network systems has become vital. Pressure reduction station (PRS) is an important part of the natural gas network. Common PRSs are facing two issues: first is the pressure reduction technology, which is throttling valve that destroys the exergy of the high pressure flow. The solution is to utilize turbo-expander instead which can recover the energy. Second is the preheating technology which is boiler and water bath heater in the common systems that cause environmental problems. Using solar collectors is one of the best solution based on the literature. Since the solar...
Development of Dynamic Model for Turbo Expander Performance Assessment in Unstable State of Natural Gas Distribution Network
, M.Sc. Thesis Sharif University of Technology ; Saboohi, Yadollah (Supervisor)
Abstract
In line with the energy policies of the country, which is based on the development of the natural gas system, the natural gas transmission sector has also had a significant expansion during this period, especially in recent years. On the other hand, the promotion of energy efficiency has been a major issue in energy policies and programs. Therefore, the necessity of expanding and developing the rational use of energy has been considered more than ever. The use of energy recovery technologies will be an effective step in this regard. Owing to the wide expansion of gas pressure regulating stations in Iran and the high potential losses in pressure relief valves, substituting an expansion...
Degradation Based Framework for Long-term Optimization of Energy Conversion Systems. Case Studies: Solid Oxide Fuel Cell Gas Turbine
, Ph.D. Dissertation Sharif University of Technology ; Roshandel, Ramin (Supervisor)
Abstract
The energy systems efficiency is a great issue confront power plants professionals. Besides using high-tech components in power plants, plant operation optimization can significantly improve energy efficiency and economic performance, as efficiency of plant components generally depends on operating conditions. In addition, system preventive maintenance can reduce plant operation and failure costs, however it is also costly when done frequently. Therefore, optimizing operating conditions and preventive maintenance intervals can minimize the expected total cost of plant due to operation, failures and preventive maintenances. In recent years, the use of optimization models to determine plant...
Assessment and Application of Solid Oxide fuel Cell-Gas Turbine Hybrid System to Improve the Performance of Wastewater Treatment Plant
, M.Sc. Thesis Sharif University of Technology ; Roshandel, Ramin (Supervisor) ; Avami, Akram (Supervisor)
Abstract
Wastewater treatment plants play an important role within the urban water cycle in protecting receiving waters from untreated discharges. In the developed and developing countries, Energy consumption of these units are 3 and 5 % of the electrical energy demand, respectively. As far as sustainable development is concerned, not only the reduction of WWTP’s energy consumption is mandatory, but also these units should produce energy. To this end, several techniques are available namely: energy audits, replacement of equipment and improvement of process efficiency. Moreover, Energy can be generated by converting biogas -from anaerobic digesters- to heat and power. Todays, Biogas is well-known as...
Considering the Environmental Effect on the Performance of Vertical Axis
Wind Turbines (VAWT)
,
M.Sc. Thesis
Sharif University of Technology
;
Sattari, Sorna
(Supervisor)
;
Boroushaki, Mehrdad
(Supervisor)
Abstract
This project aims to investigate environmental effect –such as dust and rain- on the performance of a vertical axis wind turbine (VAWT). However, those issues are frequently investigated in the horizontal axis wind turbines, but this subject has not been studied in vertical axis wind turbines. Impact of rain or dust particles on the turbine blades can change the turbine performance. So consideration of the impact of environmental factors on the performance of wind turbines is very important. Vertical axis wind turbines, particularly the straight bladed VAWT are widely used in wind power generation in agricultural and rural lighting and the use of this type of turbines is increasing...
Simulation of Flow around Building for Using Small wind Turbine in Urban Areas
, M.Sc. Thesis Sharif University of Technology ; Boroushaki, Mehrdad (Supervisor) ; Avami, Akram (Supervisor)
Abstract
Wind is one of the clean energies available in the world which its damage to the environment is less than other renewable resources. One of technologies of generating energy from wind is the small turbines installed in city area. However, installing these turbines in cities may encounter with problems such as low speed of wind and high turbulence in the air causing aero-dynamic noise. If the turbines are installed in a bad place in cities, their electricity generation might be zero. Among important parameters that affect the performance of the turbines installed in the roof is the formation of the building, the buildings around, and the location of wind turbine. If the buildings’...