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    Development of a zero emission integrated system for co-production of electricity and methanol through renewable hydrogen and CO 2 capture

    , Article International Journal of Greenhouse Gas Control ; Volume 7 , 2012 , Pages 145-152 ; 17505836 (ISSN) Soltanieh, M ; Azar, K. M ; Saber, M ; Sharif University of Technology
    In order to decrease CO 2 emission into the atmosphere and develop renewable energy sources for carbon capture, an integrated system is considered for co-production of electricity and methanol. In this research, methanol synthesis unit through captured CO 2 from fossil fuel power plant and produced H 2 from water electrolysis unit by wind renewable energy is developed. An oxy-fuel combustion carbon capture method is considered in large scale Matiant power plant based on utilization of oxygen from water electrolysis unit. Technical and economical analysis of the proposed system shows that when the price of natural gas is 7.8US$/GJ, the total CO 2 avoided cost is 93US$/(tonne of CO 2) and... 

    Branch and bound algorithms for resource constrained project scheduling problem subject to nonrenewable resources with prescheduled procurement

    , Article Mathematical Problems in Engineering ; Vol. 2014, issue , 2014 ; ISSN: 1024123X Shirzadeh Chaleshtarti, A ; Shadrokh, S ; Fathi, Y ; Sharif University of Technology
    A lot of projects in real life are subject to some kinds of nonrenewable resources that are not exactly similar to the type defined in the project scheduling literature. The difference stems from the fact that, in those projects, contrary to the common assumption in the project scheduling literature, nonrenewable resources are not available in full amount at the beginning of the project, but they are procured along the project horizon. In this paper, we study this different type of nonrenewable resources. To that end, we extend the resource constrained project scheduling problem (RCPSP) by this resource type (RCPSP-NR) and customize four basic branch and bound algorithms of RCPSP for it,... 

    A hybrid genetic and Lagrangian relaxation algorithm for resource-constrained project scheduling under nonrenewable resources

    , Article Applied Soft Computing Journal ; Volume 94 , 2020 Shirzadeh Chaleshtarti, A ; Shadrokh, S ; Khakifirooz, M ; Fathi, M ; Pardalos, P. M ; Sharif University of Technology
    Elsevier Ltd  2020
    Scheduling under nonrenewable resources is one of the challenging issues in project scheduling problems. There are many cases where the projects are subject to some nonrenewable resources. In most of the literature, nonrenewable resources are assumed to be available in full amount at the beginning of the project. However, in practice, it is prevalent that these resources are procured along the project horizon. This paper studies the generalized resource-constrained project scheduling problem (RCPSP) where, in addition to renewable resources, nonrenewable resources are considered, such as budget or consuming materials by the project activities. As the problem is NP-hard, some sub-algorithm... 

    Synthesis and characterization of bagasse poly(methyl methacrylate) graft copolymer

    , Article Macromolecular Symposia ; Volume 274, Issue 1 , 2008 , Pages 49-54 ; 10221360 (ISSN) Sarvi, I ; Pourjavadi, A ; Noei Aghaei, M. A ; Sharif University of Technology
    Graft copolymerization of methyl methacrylate (MMA) was carried out on bagasse fibers in an aqueous medium using eerie ammonium nitrate (CAN) as initiator under a neutral atmosphere. In order to obtain the optimum condition for graft copolymerization, the effects of initiator concentration, temperature, time of reaction, and monomer concentration were studied. The maximum grafting percent was found to be 122%. The bagasse grafted poly(methyl methacrylate) was characterized by FTIR and its thermal behavior was characterized by TGA. Copyright © 2008 WILEY-VCH Verlag GmbH & Co. KGaA  

    Development of a reduced order model for nonlinear analysis of the wind turbine blade dynamics

    , Article Renewable Energy ; Volume 76 , February , 2015 , Pages 264-282 ; 09601481 (ISSN) Rezaei, M. M ; Behzad, M ; Haddadpour, H ; Moradi, H ; Sharif University of Technology
    Elsevier Ltd  2015
    In this paper, a reduced order model for the nonlinear dynamic analysis of the wind turbine blade under operational loading is presented. The accuracy and efficiency of the proposed model are investigated through various static and dynamic analyses. A comprehensive straightforward formulation for the nonlinear beam model is developed based on different large deformation strain theories. Also, the fluid-structure coupling effects due to quasi-steady aerodynamics and gravitational forces are included. The new matrix expressions are introduced for direct conversion of the developed formulation into the reduced order model (ROM). Thereafter, the ROM based on the Galerkin method is developed... 

    An optimal procedure for minimizing total weighted resource tardiness penalty costs in the resource-constrained project scheduling problem

    , Article Computers and Industrial Engineering ; Volume 62, Issue 1 , 2012 , Pages 264-270 ; 03608352 (ISSN) Ranjbar, M ; Khalilzadeh, M ; Kianfar, F ; Etminani, K ; Sharif University of Technology
    We present an optimal solution procedure for minimizing total weighted resource tardiness penalty costs in the resource-constrained project scheduling problem. In this problem, we assume the constrained renewable resources are limited to very expensive equipments and machines that are used in other projects and are not available in all periods of time of a project. In other words, for each resource, there is a dictated ready date as well as a due date such that no resource can be available before its ready date but the resources are permitted to be used after their due dates by paying penalty cost depending on the resource type. We also assume that only one unit of each resource type is... 

    A hybrid scatter search for the discrete time/resource trade-off problem in project scheduling

    , Article European Journal of Operational Research ; Volume 193, Issue 1 , 2009 , Pages 35-48 ; 03772217 (ISSN) Ranjbar, M ; De Reyck, B ; Kianfar, F ; Sharif University of Technology
    We develop a heuristic procedure for solving the discrete time/resource trade-off problem in the field of project scheduling. In this problem, a project contains activities interrelated by finish-start-type precedence constraints with a time lag of zero, which require one or more constrained renewable resources. Each activity has a specified work content and can be performed in different modes, i.e. with different durations and resource requirements, as long as the required work content is met. The objective is to schedule each activity in one of its modes in order to minimize the project makespan. We use a scatter search algorithm to tackle this problem, using path relinking methodology as... 

    Expansion planning of generation technologies in electric energy systems under water use constraints with renewable resources

    , Article Sustainable Energy Technologies and Assessments ; Volume 43 , 2021 ; 22131388 (ISSN) Pourmoosavi, M. A ; Amraee, T ; Firuzabad, M. F ; Sharif University of Technology
    Elsevier Ltd  2021
    Thermal power generation needs great volumes of water for cooling purposes. A multi-period Low Water Generation Expansion Planning (LW-GEP) model is proposed to plan the future generation mix including type, capacity, time of installation, and proper cooling system of generation technologies to supply the future electric peak loads under the water resource limitations. Different types of generation technologies with conventional and modern cooling systems are considered as expansion candidates in the proposed LW-GEP model. The access of candidate and existing power plants to the water resources are considered. Renewable resources as water smart solutions are integrated in the proposed energy... 

    Standard test systems for modern power system analysis: an overview

    , Article IEEE Industrial Electronics Magazine ; Volume 13, Issue 4 , 2019 , Pages 86-105 ; 19324529 (ISSN) Peyghami, S ; Davari, P ; Fotuhi Firuzabad, M ; Blaabjerg, F ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    The reliable design, planning, and operation of power systems are of paramount importance for providing reliable services to customers. This article reviews the different aspects of power system reliability, ranging from planning to operation. Standard benchmarks employed for power system studies are reviewed according to nearly 2,500 IEEE journal papers from 1986 to early 2019. Our overview provides the pros and cons of existing test systems, implying the lack of appropriate benchmarks for future power system studies, including renewable resources and modern technologies. Furthermore, this article presents requirements for updating and modifying the benchmarks for modern power systems... 

    The competitiveness of wind power compared to existing methods of electricity generation in Iran

    , Article Energy Policy ; Volume 42 , 2012 , Pages 651-656 ; 03014215 (ISSN) Moslem Mousavi, S ; Bagheri Ghanbarabadi, M ; Bagheri Moghadam, N ; Sharif University of Technology
    In Iran, there are more than 15,000. MW of wind power potential, but only about 90. MW have been installed since 2009. Because fuel costs are the main part of fuel-consumed power generation costs and fossil resource costs are highly subsidized in Iran, renewable energies such as wind power have yet to be fully developed. This analysis sets out to evaluate the total generating costs of wind power and conventional power plants in Iran. A levelized cost approach was conducted that included investment costs, O&M costs, fuel costs and external costs of emissions for each type of technology. Comparison of cost assessments of power generation show that by taking into account global fuel prices and... 

    A robust scheduling for the multi-mode project scheduling problem with a given deadline under uncertainty of activity duration

    , Article International Journal of Production Research ; Volume 57, Issue 10 , 2019 , Pages 3138-3167 ; 00207543 (ISSN) Moradi, H ; Shadrokh, S ; Sharif University of Technology
    Taylor and Francis Ltd  2019
    The problem of this paper deals with the multi-mode project scheduling problem under uncertainty of activity duration where only the renewable resources are taken into account and a given deadline has to be met at the cost of recruiting additional resources. A heuristic algorithm is employed to solve this problem, and to maintain the robustness of the baseline schedule, the concept of critical chain project management (CCPM) is applied in which a new definition to resource buffer is considered. A simulation methodology is used to determine the size and location of resource buffers in the schedules in which three different buffer sizes and three different uncertainty levels are considered.... 

    Dye-sensitized solar cells based on a single layer deposition of TiO 2 from a new formulation paste and their photovoltaic performance

    , Article Solar Energy ; Volume 86, Issue 9 , 2012 , Pages 2654-2664 ; 0038092X (ISSN) Mohammadi, M. R ; Louca, R. R. M ; Fray, D. J ; Welland, M. E ; Sharif University of Technology
    A new strategy for enhancing the efficiency and reducing the production cost of TiO 2 solar cells by design of a new formulated TiO 2 paste with tailored crystal structure and morphology is reported. The conventional three- or four-fold layer deposition process was eliminated and replaced by a single layer deposition of TiO 2 compound. Different TiO 2 pastes with various crystal structures, morphologies and crystallite sizes were prepared by an aqueous particulate sol-gel process. Based on simultaneous differential thermal (SDT) analysis the minimum annealing temperature to obtain organic-free TiO 2 paste was determined at 400°C, being one of the lowest crystallization temperatures of TiO 2... 

    Applying circular coloring to open shop scheduling

    , Article Scientia Iranica ; Volume 15, Issue 5 , 2008 , Pages 652-660 ; 10263098 (ISSN) Modarres, M ; Ghandehari, M ; Sharif University of Technology
    Sharif University of Technology  2008
    In this paper, a new approach to formulate a class of scheduling problems is introduced, which can be applied to many other discrete problems with complicated structures. The concept of graph circular coloring is applied to develop a model for the special case of an open shop scheduling problem. In this problem, there are some independent jobs to be processed in a shop with dedicated renewable resources. Each job consists of several tasks with no precedence restriction. Each task is processed without preemption. The processing time of the tasks is given. Processing each task requires using some multiple specified types of resource, while no more than one task can use each resource,... 

    Stochastic modeling of the energy supply system with uncertain fuel price - A case of emerging technologies for distributed power generation

    , Article Applied Energy ; Volume 93 , 2012 , Pages 668-674 ; 03062619 (ISSN) Mirkhani, S ; Saboohi, Y ; Sharif University of Technology
    A deterministic energy supply model with bottom-up structure has limited capability in handling the uncertainties. To enhance the applicability of such a model in an uncertain environment two main issues have been investigated in the present paper. First, a binomial lattice is generated based on the stochastic nature of the source of uncertainty. Second, an energy system model (ESM) has been reformulated as a multistage stochastic problem. The result of the application of the modified energy model encompasses all uncertain outcomes together and enables optimal timing of capacity expansion. The performance of the model has been demonstrated with the help of a case study. The case study has... 

    Investigating the impacts of energy storage systems on transmission expansion planning

    , Article 2017 25th Iranian Conference on Electrical Engineering, ICEE 2017, 2 May 2017 through 4 May 2017 ; 2017 , Pages 1199-1203 ; 9781509059638 (ISBN) Mazaheri, H ; Abbaspour, A ; Fotuhi Firuzabad, M ; Farzin, H ; Moeini Aghtaie, M ; Sharif University of Technology
    Increased electricity demand coupled with investment in renewable-based generating units has resulted in problems such as transmission congestion and load shedding in modern power systems. In this situation, transmission expansion planning (TEP) studies plays a key role in dealing with the aforementioned problems. On the other hand, deployment of energy storage systems (ESSs) has been regarded as a viable solution for effective exploitation of renewable resources. In this context, this paper develops a novel framework to investigate the impacts of storage facilitates on the transmission expansion planning problem. The presented framework is decomposed to investment and operation subproblems... 

    A modified PSO algorithm for minimizing the total costs of resources in MRCPSP

    , Article Mathematical Problems in Engineering ; Volume 2012 , 2012 ; 1024123X (ISSN) Khalilzadeh, M ; Kianfar, F ; Shirzadeh Chaleshtari, A ; Shadrokh, S ; Ranjbar, M ; Sharif University of Technology
    We introduce a multimode resource-constrained project scheduling problem with finish-to-start precedence relations among project activities, considering renewable and nonrenewable resource costs. We assume that renewable resources are rented and are not available in all periods of time of the project. In other words, there is a mandated ready date as well as a due date for each renewable resource type so that no resource is used before its ready date. However, the resources are permitted to be used after their due dates by paying penalty costs. The objective is to minimize the total costs of both renewable and nonrenewable resource usage. This problem is called multimode resource-constrained... 

    A novel integrated solar desalination system with a pulsating heat pipe

    , Article Desalination ; Volume 311 , 2013 , Pages 206-210 ; 00119164 (ISSN) Kargar Sharif Abad, H ; Ghiasi, M ; Jahangiri Mamouri, S ; Shafii, M. B ; Sharif University of Technology
    The application of the solar energy in thermal desalination devices is one of the most beneficial applications of the renewable energies. In this study, a novel solar desalination system is introduced, which is benefited from the undeniable advantages of pulsating heat pipe (PHP) as a fast responding, flexible and high performance thermal conducting device. Results show a remarkable increase in the rate of desalinated water production and the maximum production reaches up to 875mL/(m2.h). However, the optimum water depth in basin and the filling ratio of the PHP are measured 1cm and 40%, respectively  

    The impact of wind farms with doubly fed induction generators on power system electromechanical oscillations

    , Article Renewable Energy ; Volume 50 , 2013 , Pages 780-785 ; 09601481 (ISSN) Jafarian, M ; Ranjbar, A. M ; Sharif University of Technology
    Introduction of large amounts of new wind generation can affect the small signal stability of power systems with three mechanisms: displacing synchronous generators (SGs); reducing SGs power generation; and the dynamics of wind farms (WFs) interacting with the electromechanical mode of SGs. In this paper a novel approach is developed to investigate the impact of the latter mechanism on existing power systems oscillations. In this approach, the dynamic behavior of grid connected WFs is studied independent of the dynamic behavior of system SGs. This approach helps to identify the conditions in which the dynamics of WFs may interact with the electromechanical mode of SGs. Also it helps to... 

    Optimal constrained non-renewable resource allocation in PERT networks with discrete activity times

    , Article Scientia Iranica ; Volume 19, Issue 3 , 2012 , Pages 841-848 ; 10263098 (ISSN) Hashemin, S. S ; Fatemi Ghomi, S. M. T ; Modarres, M ; Sharif University of Technology
    In this paper, we develop an approach to optimally allocate a limited nonrenewable resource among the activities of a project, represented by a PERT-Type Network (PTN). The project needs to be completed within some specified due date. The objective is to maximize the probability of project completion on time. The duration of each activity is an arbitrary discrete random variable and also depends on the amount of consumable resource allocated to it. On the basis of the structure of networks, they are categorized as either reducible or irreducible. For each network structure, an analytical algorithm is presented. Through some examples, the algorithms are illustrated  

    Assessing operational flexibility of microgrids considering electrical and thermal energy resources

    , Article 2019 Smart Gird Conference, SGC 2019, 18 December 2019 through 19 December 2019 ; 2019 ; 9781728158945 (ISBN) Hadi, M. B ; Moeini Aghtaie, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    With high growth rate of demand for energy in different societies, the need for energy resources has been increased significantly. This has resulted in introduction of new energy resources, i. e. renewable energy resources in generation sector of energy systems. However, the intrinsic features of these energy resources call for higher flexibility in different sectors of energy systems. Flexibility in a comprehensive sense tries to cover the amount of imbalance between production and demand in energy systems. This paper has attempted to introduce the concept of operational flexibility in microgrids and it also has presented a step-by-step algorithm to assess this operational index based on a...