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supply-systems
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Feasibility Study and Conceptual Design of Solar Energy Source for Surface Train System
, M.Sc. Thesis Sharif University of Technology ; Durali, Mohammad (Supervisor)
Abstract
Advancements in solar powered systems bring about the possibility for today’s transportation systems to be operated and driven by such a clean and renewable source of energy. The challenging point of this combination is to draw high power levels from such a low power density source of energy. As a result, employing an efficient power storage and management system becomes inventible. The subjects of this research are to design a grid connected system and evaluate its performance and feasibility in a real application (Tehran- Mehrshahr surface train – Tehran 5th Metro Line). The task includes sixteen pairs of DC transmission lines which are powered by CIGS solar module technology and four...
Probabilistic Safety Assessment of IR-360 for Station BlackOut Accident (SBO) and Determination of the Frequency of Occurrence
, M.Sc. Thesis Sharif University of Technology ; Ghofrani, Mohammad Bagher (Supervisor) ; Yousefpour, Faramarz (Supervisor) ; Karimi, Kave (Co-Advisor)
Abstract
Station Blackout (SBO) involves Loss of Offsite Power (LOOP) concurrent with failure of the onsiteemergency ac power system. Although SBO is a beyond designbasis accident, in recent years this accident attracts a lot of attention. Fukushima nuclear accident which was initiated by earthquake followedby tsunami led to a SBO accident. In this thesis, Probabilistic Safety Assessment (PSA) is applied to analyze SBO in IR-360 nuclear power plant and to compute its frequency. Meanwhile, weak points of the plant are identified in order to minimize the SBOprobability of occurrence. Fault tree method is used to evaluate emergency power system and offsite power system reliabilities. Common Cause...
Design and Numerical Optimization of Hot Air Supply System of Connected-pipe Ramjet Engine Test Facility
, M.Sc. Thesis Sharif University of Technology ; Mazaheri, Karim (Supervisor)
Abstract
In the present study an air supply system of a connected-pipe ramjet test facility for liquid fuel ramjet engine in theoretical and numerical base designed and optimized that the purpose is for performance test of a ramjet engine combustor in flight condition. The flight condition gained from previous assessment that is 1.5 kg air in 10 bars and 550 K. Air supply subsystems consist of air tanks, compressors, valves, regulators, preheater, and fuel and oxygen systems that are designed in a preliminary process and then valves, orifices, and fuel and oxygen systems optimized by HYSYS program. In the last step preheater that is a gas turbine combustor investigated and possible changes made by...
Application of PSA Methods in the Reliability Analysis of EPSS of Busherhr NPP in case of Station Black Out
, M.Sc. Thesis Sharif University of Technology ; Ghofrani, Mohammad Bagher (Supervisor)
Abstract
LOOP accident is one of the most important accidents in NPPS and it leads to loss of power supply of the RCP pumps which are the main pumps of primary circuit. Subsequently trip of the rector occurs. In safety analysis, concerning worst conditions, assumes that after a small period of time, main generator of plant stops working and loss of AC power supply of all power plant loads including safety systems ocures. To control of this accident, it’s necessary to startup and load backup power supply system (EDGs) for at least one safety channels, if not, the accident moves forwards and becomes S.B.O accident which is more important accident that ends to core damage because of stops working of all...
Evaluation of the Impact of Changes in Properties of Crude Oil on Technical Features of Petroleum Supply Chain
, M.Sc. Thesis Sharif University of Technology ; Saboohi, Yadollah (Supervisor)
Abstract
Energy system of each country include of extraction, processing, conversion, transportation and distribution levels. Crude oil is one of the energy carrier which has dominant share to meet energy demand in industry and transportation sectors. Therefore, studying of physical properties changes of this energy carrier during production period is obligatory. The goal of this research is to model quality reduction of crude oil during production period of naturally occurring reservoirs. In this research quality of crude oil has been investigated inside of reservoir and after production and the effect of quality changes in before mentioned conditions according to cumulative production of reservoirs...
Optimal Electricity Energy Supply and Demand System for Iran to Meet Emissions Pledge Under the Paris Climate Accord
, Ph.D. Dissertation Sharif University of Technology ; Maleki, Abbas (Supervisor)
Abstract
In this thesis, an optimum structure of electricity supply system will be presented that consumer and producer interests are provided in order to reducing greenhouse emissions in achieving targets Paris Accord. So, at first, subsidy of fossil and renewable power plants were determined with considering Iran’s energy rules and applying variables such as efficiency, FOB price of oil and natural gas, inflation rate, energy conversion price and FIT in renewable power plants. At second, electricity price will be estimated by System Dynamics (SD) method and Pay as bid pricing mechanism in energy market on years between at 2018 to 2030 (time period of Paris Accord). Based on the subsidy of fossil...
Modelling the Interaction Between Electricity Supply System and Climate Change: the Case Study of Iran
, M.Sc. Thesis Sharif University of Technology ; Saboohi, Yadollah (Supervisor)
Abstract
The power supply system is one of the most important and complex systems. Various factors affect this system. Climate change affects different parts of the power supply system. In this study, the effect of climate change on electricity demand and electricity supply system has been investigated by considering the limited water resources. The amount of water withdrawal and GHG emissions in different scenarios. Scenarios are considered in such a way that assess the probable rising prices of fuels and water, and carbon taxes at three levels. Also, scenarios of rising water prices have been considered to evaluate the effect of this policy alone. It is worth noting that power plants are modeled...
Development of a saturation-based μ(I)-rheology for wet granular materials using discrete element method
, Article Scientia Iranica ; Volume 28, Issue 5 B , 2021 , Pages 2719-2732 ; 10263098 (ISSN) ; Taghizadeh Manzari, M ; Hajilouy Benisi, A ; Sharif University of Technology
Sharif University of Technology
2021
Abstract
The present study employs Discrete Element Method (DEM) to establish a rheological model that relates the apparent viscosity of a granular material to shear rate, normal stress, and water saturation. In addition, a theoretical model was developed to determine water distribution and water-induced forces between particles for different saturations. The resulting forces were embedded in a 3D shear cell as a numerical rheometer, and a wet specimen was sheared between two walls. A power law rheological model was then obtained as a function of inertia number and saturation. It was found that up to a critical saturation, the apparent viscosity increased with saturation that was higher than that of...
Multi objective planning for sustainable retrofit of educational buildings
, Article Journal of Building Engineering ; Volume 24 , 2019 ; 23527102 (ISSN) ; Aramoun, F ; Bararzadeh, M ; Avami, A ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
The sustainable retrofit options may significantly improve the energy consumption and the environmental impacts of the existing buildings. This paper presents a multi objective optimization framework to reach the minimum economic costs and Global Warming Potential (GWP) impact of existing buildings. New energy-efficient technologies for the supply side of the energy system are considered which may minimize life cycle environmental impacts of buildings. Two educational buildings in the campus of Sharif University of Technology are studied. The results show that utilizing reciprocating engine and exhaust-fired absorption chiller reduce the GWP to 133 tons (17.79% of reduction) and 190 tones...
Extended energy return on investment of multiproduct energy systems
, Article Energy ; Volume 192 , 2020 ; Khajehpour, H ; Saboohi, Y ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Energy Return on Investment (EROI) is an indicator of how efficient is an energy supply system. In the present study, the conventional approach of EROI assessment is extended to include the equivalent energy investment needed for offsetting the life cycle environmental impacts. Moreover, the issue of allocation of the invested energy among different by-products is addressed. The EROI of multiple products has been specified using different benchmarks of price, energy content, exergy content, and exergy costs. The application of the concept is demonstrated through a case study of an Iranian oil production unit. The overall conventional and environmentally-extended EROI values of the produced...
A model for investigation of optimal hydrogen pathway, and evaluation of environmental impacts of hydrogen supply system
, Article International Journal of Hydrogen Energy ; Volume 33, Issue 24 , 2008 , Pages 7314-7325 ; 03603199 (ISSN) ; Saboohi, Y ; Shayegan, J ; Sharif University of Technology
Elsevier Ltd
2008
Abstract
In order to achieve a hydrogen economy, developing widespread hydrogen supply systems are vitally important. A large number of technological options exist and are still in development for hydrogen production, storage, distribution., which cause various pathways for supplying hydrogen. Besides the technical factors, there are other effective parameters such as cost, operability, reliability, environmental impacts, safety and social implications that should be considered when assessing the different pathways as optimal and viable long-term alternatives. To aid this decision-making process, we have developed a generic optimization-based model for the long-range energy planning and design of...
A thorough analysis of renewable hydrogen projects development in Uzbekistan using MCDM methods
, Article International Journal of Hydrogen Energy ; Volume 46, Issue 61 , 2021 , Pages 31174-31190 ; 03603199 (ISSN) ; Hosseini Dehshiri, S. S ; Hosseini Dehshiri, S. J ; Almutairi, K ; Taher, R ; Issakhov, A ; Techato, K ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
The energy supply system of Uzbekistan is not well positioned to meet the rapidly rising domestic energy demand of this country. Uzbekistan's current energy supply system is outdated and has very low diversity, as most of its energy comes from natural gas. In addition to producing immense amounts of greenhouse gas and environmental pollution, this situation is untenable considering the eventual depletion of fossil fuel reserves of this country. Uzbekistan's renewable energy sector is highly undeveloped, a situation that can be attributed to the lack of coherent policies for the advancement of renewable power and the low price of natural gas. However, this country has significant untapped...
Comparative analysis of agricultural water pricing between Azarbaijan Provinces in Iran and the state of California in the US: A hydro-economic approach
, Article Agricultural Water Management ; Volume 223 , 2019 ; 03783774 (ISSN) ; Zakeri, Z ; Esfandiari, M ; Behzadian, K ; Zahedi, S ; Razavi, V ; Sharif University of Technology
Elsevier B.V
2019
Abstract
Iranian water authority has recently announced that one of the effective ways to avoid unprecedented high water consumption in Iran's agriculture sector is to increase water price. This paper analyzes the feasibility of this policy by using a hydro-economic approach with the aim to consider the role of water pricing in agricultural water management. Such an analysis was conducted through comparing price of water consumed for producing selected agricultural crops (i.e. wheat, sugar beets, onion, tomato, barley, potato, corn, alfalfa hay and watermelon) in a case study on two provinces (East Azarbaijan and West Azarbaijan) in Iran to that in the state of California (CA) in the USA. According...
Pressure - Leakage relation in urban water distribution systems
, Article Proceedings of the ASCE International Conference on Pipeline Engineering and Construction: New Pipeline Technologies, Security and Safety, Baltimore, MD, 13 June 2003 through 16 June 2003 ; Volume 1 , 2003 , Pages 304-312 ; 0784406901 (ISBN); 9780784406908 (ISBN) ; Ghazali, A. A ; Sharif University of Technology
American Society of Civil Engineers Texas Section
2003
Abstract
Due to increase of per capita water usage, water supply costs and population growth rate; optimal usages of available resources are vital. This is especially important in developing countries. If we add water resource deficits to the above problems, its importance duplicates. One of the ways of using resources optimally is utilizing transferred water in distribution systems properly and preventing its loss. Unaccounted for water (UFW) is an indicator of water loss in most cities. A big part of UFW is due to leakage of pipeline in distribution systems. Researchers have found direct relation between leakage and pressure in distribution systems. Earlier works have shown a series of laboratory...
Numerical study on water distribution in different layers of direct methanol fuel cells
, Article Journal of the Electrochemical Society ; Vol. 161, issue. 8 , 2014 , pp. E3110-E3124 ; ISSN: 00134651 ; Baghalha, M ; Sharif University of Technology
Abstract
In this paper, a two-dimensional, two-phase, isothermal model is presented to investigate the water transport characteristic and water distribution in a direct methanol fuel cell (DMFC) with emphasis on exploring the water distribution in different layers of DMFC. The liquid-gas two-phase mass transport in the porous anode and cathode is formulated based on multi-fluid model in porous media and water and methanol crossover through the membrane are considered with the effect of diffusion, electro-osmotic drag, and convection. The modeling results agree well with the three different experimental data in an extensive range of operation conditions. A parametric study is also performed to examine...
Effects of microhydrophobic porous layer on water distribution in polymer electrolyte membrane fuel cells
, Article Journal of Fuel Cell Science and Technology ; Vol. 11, Issue. 1 , 2014 ; ISSN: 1550-624X ; Roshandel, R ; Sharif University of Technology
Abstract
Performance of polymer electrolyte membrane fuel cells (PEMFC) at high current densities is limited to transport reactants and products. Furthermore, large amounts of water are generated and may be condensed due to the low temperature of the PEMFC. Development of a two-phase flow model is necessary in order to predict water flooding and its effects on the PEMFC performance. In this paper, a multiphase mixture model (M2) is used, accurately, to model two-phase transport in porous media of a PEMFC. The cathode side, which includes channel, gas diffusion layer (GDL), microporous layer (MPL), and catalyst layer (CL), is considered as the computational domain. A multidomain approach has been used...
Modeling and technical-economic optimization of electricity supply network by three photovoltaic systems
, Article Journal of Solar Energy Engineering, Transactions of the ASME ; Vol. 136, issue. 2 , 2014 ; ISSN: 0199-6231 ; Khodaparast, P ; Kateb, M ; Sharif University of Technology
Abstract
To attain an ongoing electricity economy, developing novel widespread electricity supply systems based on diverse energy resources are critically important. Several photovoltaic (PV) technologies exist, which cause various pathways to produce electricity from solar energy. This paper evaluates the competition between three influential solar technologies based on photovoltaic technique to find the optimal pathways for satisfying the electricity demand: (1) multicrystalline silicon; (2) copper, indium, gallium, and selenium (CIGS); and (3) multijunction. Besides the technical factors, there are other effective parameters such as cost, operability, feasibility, and capacity that should be...
Assessment of an optimized combination of Iranian power plants by environmental costs impact of carbon tax and fossil fuel price on longterm development of iranian electricity supply system
, Article Journal of Environmental Studies ; Vol. 40, issue. 2 , 2014 , p. 415-430 ; Farmad, M ; Aryanpur, V ; Shafiei, E ; Sharif University of Technology
Abstract
Despite the abundant renewable energy sources, the Iranian energy sector relies almost entirely on fossil fuel energy resources. Power sector is dominant source of CO2 emissions and responsible for about 35% of total CO2 emissions in the country. Additionally, long-term electricity demand of Iran is expected to grow quickly, which in turn requires extensive investment to meet the growing demand over the next decades. On the other hand, increasing domestic fossil fuel consumption had been a serious challenge due to high costs of oil and gas. Current study pays particular attention to the possible penetration rates of renewable electricity technologies and their implications for fossil fuel...
Evaluation of energy recovery and potential of hydrogen production in Iranian natural gas transmission network
, Article Energy Policy ; Volume 61 , 2013 , Pages 65-77 ; 03014215 (ISSN) ; Saboohi, Y ; Kateb, M ; Sharif University of Technology
2013
Abstract
In the natural gas transmission network, from supply points to demand nods there are various technological options that include processing, transportation, conversion and gas distribution. Comprehensive analysis of natural gas network requires evaluation of different chains of gas flow through various levels based on economical and environmental criteria subject to technical and operational constraints such as feasibility, operability and reliability of different alternatives. To aid decision-making process in the sector of natural gas, a generic optimization-based model has been developed for assessing long term energy issues related to planning and design of natural gas supply systems. The...
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) ; Saboohi, Y ; Sharif University of Technology
2012
Abstract
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...