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Design and Implementation of Protected Smart High Side and Low Side Switch and Drivers in 0.18um HV BCD CMOS Technology
, M.Sc. Thesis Sharif University of Technology ; Medi, Ali (Supervisor) ; Zolghadri, Mohammad Reza (Supervisor)
Abstract
In this thesis, two types of smart switch & driver chips are designed in 0.18 um HV BCD technology; low side driver and high side driver. These drivers are smart, because of having various types of protection and detection circuits, which protect switch, driver and connected load, versus errors that can be occurred by the user or other environmental effects. The protection circuits are battery over & under voltage shutdown, current limit, inductive load clamper and thermal shutdown. Load status is checked by status detection circuit and reported to user by one bit flag. Battery voltage can vary from 7 V to 40 V and output current is limited to 2 A. Designed high side and low side drivers are...
Effect of variable Geometry on a Vertical Two Phase Flow
, M.Sc. Thesis Sharif University of Technology ; Nouri Borujerdi, Ali (Supervisor)
Abstract
The aim of this research is to consider the effect of geometric changes on pumping performance of two phase gas-fluid flow in a vertical pipe. The idea is to inject a light gas to the bottom of a tube full of fluid so we will obtain an upward flow due to density differences. Potential benefits of this device are numerous such as dredging of river estuaries and harbors, sludge extraction in sewage treatment plant, water treatment and many others. There are almost four distinct flow patterns which occurs in the rise pipe, bubbly flow, slug flow, churn flow and annular flow that each of them require special conditions. heat transfer between two phases, phase changes, mass and volume rate...
Exergy Analysis of Thermoacoustic Heat Pump with Industrial Application
, Ph.D. Dissertation Sharif University of Technology ; Ghorbanian, Kaveh (Supervisor)
Abstract
Typical thermoacoustic systems deal with the conversion of heat energy to sound energy and vice versa. Recent advances in the field of thermoacoustics have altered the working mechanism of many conventional heating and cooling devices. These systems have three highlighted advantages: first, they have simple structure, no moving parts, low cost of manufacture, and high reliability; second, by using inert gases as working fluid, they are environmentally friendly; and finally, heat driven thermoacoustic devices can be driven by low quality energy sources such as waste heat and solar energy.
The main focus of the present thesis is on the application of the thermoacoustic technology in the...
The main focus of the present thesis is on the application of the thermoacoustic technology in the...
A Penalty Method for Mixed-Integer Optimization
, M.Sc. Thesis Sharif University of Technology ; Mahdavi-Amiri, Nezamoddin (Supervisor)
Abstract
Linear and nonlinear problems on integer and real numbers constitute very important optimization problems. Recently, methods have been developed using pumps to solve this type of problem. Feasibility pumps usually produce random perturbations. In this method,the generated random perturbations are replaced by a penalty framework and feasibility pumps are introduced as methods of displacement. Feasibility pump algorithms on 0-1 are used to solve these problems and the alternating direction methods are used. A convergence theorem is presented for the alternate direction method based on the penalty.New changes to the feasibility pumps and existing algorithms for solving linear and nonlinear...
Identification Dynamic Modeling and Analysis of a Variable Displacement Axial Piston Pump
, M.Sc. Thesis Sharif University of Technology ; Salarieh, Hassan (Supervisor)
Abstract
According to high nominal pressure and controllable flow, variable displacement axial piston pumps are used widely in hydraulic industry. However, there still exist many problems and limitations in the areas of design, controllers and performance. To solve the problems without wasting time and money in making prototypes, an accurate dynamic model of the pump is required which predicts pump behavior under various control signals and loads. The lack of simple and practical methods of measuring describing parameters of pump dynamics, makes investigation and verification of such a model very challenging. In this thesis, literature review is presented in a wide range. After investigating of...
Study of ESP and Gas Lift Applications On low Productivity Wells of Alvand Oil Field
, M.Sc. Thesis Sharif University of Technology ; Jamshidi, Saeed (Supervisor)
Abstract
Alavand Oil field is located 50 Km away from west of Siri Island and includes DPG and DPH platforms. The production from Alavand field started in 1998 and till now 11 wells have been totally drilled .Since a production peak in 2001, the oil production in Alvand field has decreased. Water cut is increasing and reservoir pressure is decreasing gradually. Considering poor reservoir characteristic of this reservoir, productivity indexes of wells are relatively low. In addition; natural depletion of reservoir caused the wells to be unable to flow naturally and either closed or produce periodically consequently. To increase production and extend the lifetime of Alvand field, it is decided to start...
Modeling and Sensitivity Analysis of a Servohydraulic Pump
, M.Sc. Thesis Sharif University of Technology ; Kazemzadeh Hannani, Siamak (Supervisor) ; Saadat Foumani, Mahmoud (Co-Advisor)
Abstract
Servo hydraulic pumps are being utilized in hydraulic circuits to prevent hydraulic oil reaching high temperatures in result of relief valve’s functions. In this study, we focus on modeling and sensitivity analysis of a pump of this kind. At first the importance of the current study and some of related studies has been discussed and some of the appropriate results has been represented. Then by employing CFD and Fluent code, the flow around servo valve of pump has been simulated, and operational curve of the valve has been calculated. This curve has been verified by results of the experimental set. At the next stage of the study, by modeling Dynamic parts of the pump in SIMULINK software and...
Technical and Economical Feasibility Study of Using Solar Assisted Ground Source Heat Pumps in Iran
, M.Sc. Thesis Sharif University of Technology ; Sattari, Sorna (Supervisor)
Abstract
This research presents technical and economical feasibility study of using solar assisted ground source heat pumps (SAGSHPs) in different climatic zones of Iran. In order to evaluate technical and economical parameters of SAGSHPs, Iran is divided in to six main climatic zones including Tehran, Tabriz, Yazd, Rasht, Bandar abbas and Ardabil. Cooling and heating demands for a 1000 m2 residential building is calculated for each city, using modified bin method. Then a technical model has been developed by MATLAB software in order to evaluate systems optimal scale for supplying energy demands in each city. An economical model has been developed as well, to evaluate system’s annual energy savings...
Fault Detection in Centrifugal Pump Using Current Signature Analysis of Induction Motor and Vibration
, M.Sc. Thesis Sharif University of Technology ; Behzad, Mehdi (Supervisor) ; Asghari, Mohsen (Supervisor)
Abstract
Pumps are widely used in oil and gas industry. Therefore condition monitoring for this type of equipment is very important. The motor current signature analysis (MCSA) technique as one of the condition monitoring techniques is very effective in the industry, but it is less used in industry. All conventional methods require additional sensors to be installed in the system; current signature analysis as a sensorless method can reduce the cost of condition monitoring. In this study, motor current signature analysis technique was used to diagnosis a centrifugal pump with a capacity of 187 kW from the refinery industry. The impeller wearing ring clearance problem has been investigated. This...
Studying the Effect of Using Zeotropic Refrigerant Mixtures on the Performance of the Vertical Ground Coupled Heat Pump
, M.Sc. Thesis Sharif University of Technology ; Hakkaki Fard, Ali (Supervisor) ; Kazemzadeh Hannani, Siamak (Supervisor)
Abstract
Vertical ground-coupled heat pumps due to using a renewable energy stored in the ground and being away from ambient temperature fluctuations have a good coefficient of performance and very low pollution. Despite these advantages, these systems have not gained a pervasive position in the field of heating/cooling systems due to their high initial cost. Despite these advantages, these systems have not gained a pervasive position among communities due to their high initial cost. In the present project, a comprehensive study has been conducted to investigate the effect of using zeotropic refrigerant mixtures on the performance of vertical ground-coupled heat pumps and reducing its initial costs....
Implementing the Appropriate Numerical Method for Modeling the Two-Phase Flow in Upriser Pipe of Airlift Pump
, M.Sc. Thesis Sharif University of Technology ; Saeedi, Mohammad Hassan (Supervisor) ; Kazemzadeh Hannani, Siamak (Supervisor)
Abstract
Airlift pumps are devices for lifting liquid phase incorporating the gas phase to be injected in the bottom of the liquid column. Gas-liquid two-phase flow being the main part of the flow through these systems, flowing in vertical pipes of airlift pumps has different regimes namely bubbly, slug, churn and annular. Generally these regimes appear starting from bubbly to annular from bottom to top of the upriser pipe. Gas/liquid multiphase flows occur in a wide range of natural and man-made situations such as boiling heat transfer, cloud cavitation, bubble columns and reactors in the chemical industry, cooling circuits of power plants, spraying of liquid fuel and paint, emulsions, rain, bubbles...
Investigation Methods to Optimize the Operation of the RO Plant of Hakim Farabi Agri Industrial Co
, M.Sc. Thesis Sharif University of Technology ; Hashemian, Jamaloddin (Supervisor) ; Mousavi, Reza (Co-Advisor)
Abstract
Membrane fouling is the main cause of permeate flux decline and loss of product quality in reverse osmosis (RO) systems, so good pretreatment of the feed solution was required to prevent membrane fouling. One of the most common applied pretreatment methods to prevent or control the scaling of different salts in feed water is to add scale inhibitors. Due to the great variety of commercial scale inhibitors RO plant operators must evaluate these chemicals before use in real plants. In this project three different types of antiscalants at concentrations of 10 ppm and one type of magnetic descaler on the RO pilot for the R.O plant feed water of agro-industrial Hakim Farabi evaluated and function...
Studing and Optimization of Combined Geothermal Heat Pump and Solar Collector to Heating and Cooling Load Supply for Dwellings
, M.Sc. Thesis Sharif University of Technology ; Rajabi, Abbas (Supervisor) ; Boroushaki, Mehrdad (Supervisor)
Abstract
Combined geothermal heat pump and solar collector system is a kind of load supply system for dwellings and greenhouses that operates by relying on renewable energies. The advantage of this system over conventional systems is lower power consumption. The aim of this study is to optimize the hybrid system so that in addition to reducing energy consumption and exergy destroied of the system, economically be minimized. In fact, in this study, we are dealing with an issue that should be optimize from different aspects. firstly, thermodynamic modeling for vertical ground source heat pump is done and then by considering 11 decision variables, the system is optimized by using single-objective and...
Design, Analysis and Prototyping of Cylindrical Electropump with Radial Space Limit
, M.Sc. Thesis Sharif University of Technology ; Arghavani Hadi, Jamal (Supervisor)
Abstract
Inflatable packers are a class of downhole equipments that are used for oilwell pluging operations. To set the packer inside the well, it is necessary to apply hydraulic pressure to it. By using the setting tool and installing an electropump in it, it is possible to transfer the fluid into the packer and supply the required pressure. In this research, an electropump has been designed and built that, firstly, is dimensionally suitable for the conditions of oil wells and, secondly, can have a good performance in the environmental conditions inside the well. This electropump, which can be used in a 2.125-inch setting tool, consists of a brushless direct current motor and a piston pump. To test...
Design, Manufacturing and Parametric Optimization of a Left Ventricular Assisted Device
, M.Sc. Thesis Sharif University of Technology ; Zohoor, Hassan (Supervisor) ; Firoozbakhsh, Keikhosrow (Supervisor) ; Ahmadian, Mohammad Taghi (Co-Supervisor)
Abstract
The heart is a vital part of the body whose primary function is to pump blood throughout the body. The world's leading cause of deaths is due to heart problems. Today, most countries invest heavily in solving these problems and preventing the resulting deaths. One solution for patients with advanced heart disease is to use ventricular assist devices. This device is Used in parallel to the patient's heart, completely or partially replaces the normal functioning of the heart and provides much of the blood needed by the body. The purpose of this study is to design, manufacture and parametrically optimize a ventricular assist pump and its driver system. Since blood is clotted in contact with...
Determination of Suitable Parameters for Design of Nozzle & Diffuser of Surface Jet Pump for Transmission of Low-Pressure Oil Through High- Ressure Oil
,
M.Sc. Thesis
Sharif University of Technology
;
Arghavani Hadi, Jamal
(Supervisor)
;
Hakkaki Fard, Ali
(Co-Supervisor)
Abstract
Surface Jet Pump (ejector) is one of the most widely used equipment in the industry, which can be used in the oil and gas industry, propulsion and refrigeration systems. One of the uses of surface jet pumps in the oil and gas industry is the use of high-pressure wells to transfar low-pressure wells. The purpose of this research is to measure the transmission feasibility of low-pressure wells using surface jet pumps and optimize surface jet pump geometry. The purpose of optimizing the geometry of the surface jet pump is to maximize the ratio of the discharge rate from the low-pressure well to the high-pressure flow (entranment ratio). One of the most common methods for optimizing the...
Assessment of Water and Sewage Facilities of Kish Island and Offering Solutions in Emergency Conditions (A Case Study on Kish Island)
, M.Sc. Thesis Sharif University of Technology ; Hashemian, Jamal (Supervisor)
Abstract
Vulnerability of water and sewage infrastructure in Kish Island survey versus natural and unnatural threats. It is important to know what to do when crisis or unpredicted event occurs in the Island. Decision makers and master managers of the Island, as the main custodians make suitable and effective reactions and decisions so that the impact of threats is reduced to minimum. According to the threats, there are short term and long term solutions. These solutions can be applied when the Island is encountered with crisis
Design and Fabrication of a Vacuum Chamber Exhaust for a Thruster Testing in High Altitude Simulation
, M.Sc. Thesis Sharif University of Technology ; Farahani, Mohammad (Supervisor)
Abstract
High-altitude simulation lab of chemical thrusters is one of the most important infrastructures for the development of space thrusters technology. In these laboratories, different sections are designed according to the requirements for simulation of the thrusters at specific pressure and temperature. The purpose of this research is to design a subset of the creation and preservation of vacuum for the purpose of ground testing of chemical thrusters. Vacuum preservation is more comprehensive than the vacuum creation and is usually the bottleneck of design, so the design of this subset is intended in the present study. To illustrate this, after introducing the basic concepts required, two...
Impact of Net Stress on Stress State of an Unsaturated Sand
, M.Sc. Thesis Sharif University of Technology ; Khosravi, Ali (Supervisor)
Abstract
Results of an advanced suction controlled triaxial test device in an attempt to define the constitutive relationship between suction stress and matric suction (Suction Stress Characteristic Curve, SSCC) for unsaturated sand was presented. The suction stress is a macroscopic stress that incorporates the effects of capillary van der Waals forces cementation, and electrical double-layer repulsion into the definition of effective stress for unsaturated soils. Results of previous studies on silt and clay indicated that variations in the suction stress, during drying path had a non-linear increasing trend with matric suction with greater values upon wetting. However, due to different material...
Fuzzy ANN Approach to Support Independent Failures of Rotary Equipment Based on Vibration, Temperature Parameters-Case Study: A Centrifugal Pump in offshore Industry
, M.Sc. Thesis Sharif University of Technology ; Ghaemi Osgouie, Kambiz (Supervisor) ; Ebrahimi Pour, Vahid (Co-Advisor)
Abstract
Pump operating problems may be either hydraulic or mechanical and there is interdependence between the failure diagnoses of these two categories. Consequently, a correct diagnosis of a pump failure needs to consider many symptoms including hydraulic or mechanical causes. Nonlinear, time-varying behavior, and imprecise measurement information of the systems makes it difficult to deal with pump failures with precise mathematical equations, while human operators with the aid of their practical experience can handle these complex situations, with only a set of imprecise linguistic if-then rules and imprecise system states, but this procedure is time consuming and needs the knowledge of human...