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    Thermal-economic Modeling and Optimization of Ground-Coupled Heat Pump System for Various Climatic Conditions of Iran

    , M.Sc. Thesis Sharif University of Technology Tabarjafar Gholibisheh, Hamzeh (Author) ; Abbaspour Tehrani Fard, Madjid (Supervisor)
    The optimal design of a ground-coupled heat pump (GCHP) system with vertical ground heat exchanger (VGHX) includes thermal modeling of the system and selection of optimal design parameters is presented in this research. Then, by applying Nelder-Mead optimization algorithm, an objective function (Total Annual Cost which is the sum of annual investment and operating costs of the system) is defined and minimized, exposed to specified design constraints. Also, Genetic Algorithm is used to verify the optimal design process. In order to evaluate the accuracy of a presented model, the optimum values of a heat pump design parameters includes saturated temperature/pressure of a condenser and... 

    Numerical Investigation on Offshore wind Turbine Feasibility and Function

    , M.Sc. Thesis Sharif University of Technology Ebrahimi, Alireza (Author) ; Abbaspour Tehrani Fard, Madjid (Supervisor)
    This thesis consists of three main chapters. The first chapter is about describing principles about offshore wind turbine, principal concepts. This chapter also explains about advantages and disadvantages of installing wind turbine at offshore fields, and economical aspect of this kind of wind turbine farms. In the second chapter,anumerical method is used to investigate a SeaStar tension leg platform offshore wind turbine response behavior in parked condition. This code considers nonlinearities due to changes in tension of tethers. Wave forces are calculated adopting the Airy wave theory. Furthermore, shear turbulent wind is exerted on tower, with maximum speed 30 m/s on the hub. Since surge... 

    Dynamic Analysis of Floating Offshore Wind Turbines

    , M.Sc. Thesis Sharif University of Technology Imani, Hassan (Author) ; Abbaspour Tehrani Fard, Madjid (Supervisor)
    Use of wind energy is always one of the aims of man during the times. He used this energy for wheat grinding and sometimes for marine transportations. During recent decades, technology development forced human to harness this energy and use that for electricity production by employing onshore wind turbines. However, the modern engineering employed different arms of engineering such as marine engineering, civil engineering, mechanical engineering and electrical engineering for designing and installation of offshore wind turbines. But, huge water depths in offshore regions make the fixed leg turbines to be unacceptable solution. So, the floating wind turbines with mooring lines which attach... 

    Site Selection and Design of an Optimal OWC System for the Coastal and Offshore Areas of the Persian Gulf and the Sea of Oman

    , M.Sc. Thesis Sharif University of Technology Savaedi, Mohamad (Author) ; Abbaspour Tehrani Fard, Madjid (Supervisor)
    Today, to reduce the effects of greenhouse gases on the earth, as well as reduce dependence on fossil fuels and other non-renewable sources, the international community is moving towards greater use of renewable energy. The oscillating water column device as a wave energy converter system has the ability to use and absorb energy within the waves through a chamber consisting an air and a water column. This system has the ability to move the turbine installed on the valve by expanding and compressing the air passing through the valve. Oscillating water column systems have different categories, and this high diversity makes the choice of this wave energy converter closely related to the... 

    Numerical Simulation and Investigation of Impact of Climate Change on Probability Occurrence of Tropical Cyclone in Sea of Oman and Persian Gulf

    , M.Sc. Thesis Sharif University of Technology Ilami, Dariush (Author) ; Abbaspour Tehrani Fard, Madjid (Supervisor)
    Super cyclone GONU formed on June 2007 has been recognized the strongest tropical cyclone in the North Indian Ocean (NIO). The aim of this study is to numerically simulate the cyclone GONU and its resulting waves in the southern seas of Iran leading to the best parametric model to simulate future occurrence of tropical cyclones (TCs) in the NIO. In this regard, the best track data of the cyclone is extracted from Indian Meteorological Department (IMD). The cyclone GONU wind field is simulated by Young and Sobey, Holland, and Rankin models in order to determine the most appropriate model which is then considered for regenerating cyclonic wind fields over the Makran coastline and the sea of... 

    Numerical Modeling of Regular Wave and Conventional Tension Leg Platform Interaction using Boundary Element Method

    , M.Sc. Thesis Sharif University of Technology Ahmadi, Ali (Author) ; Abbaspour Tehrani fard, Madjid (Supervisor) ; Ketabdari, Mohammad Javad (Supervisor)
    Petroleum is the main source of energy in the world. So, exploration and production of this strategic matter from earth and sea has a major importance. A large amount of this black gold is hidden under deep seas floors and extraction of these sources requires knowledge of design and technology of construction of deep water offshore platforms and equipments. Convetional Tension Leg Platform (CTLP), configured as 4 cloumns and 4 pontoons, is one of deep offshore platforms moored by several pretensioned tethers. The dynamic behavior characteristics of CTLPs are extracted in this thesis by numerical modeling of CTLP and regular wave interaction. A computer program PARADISE is developed in... 

    Sedimentation Investigation and Numerical Analysis of Dredging Trailing Disposal

    , M.Sc. Thesis Sharif University of Technology Shahvelayati, Roozbeh (Author) ; Abbaspour Tehrani Fard, Madjid (Supervisor) ; Khorasanchi, Mahdi (Supervisor)
    every year large amounts of sedimentation are getting dredged all over the world. Dredging operation includes several processes such as excavating from the sea bottom, transferring them to the surface, and most important, releasing them in another area which can cause a sediment particle cloud that can be really harmful to the surrounding environment. Therefore, accurate analysis of this phenomenon is necessary to prevent catastrophic damages. The Eulerian-Lagrangian numerical method considers both sediment particles and fluid physics for a better simulation of near-field area. In this project, after investigating open-source available software for the Eulerian-Lagrangian simulation, a new...