Enhanced solar still condensation by using a radiative cooling system and phase change material

, Article Desalination ; Volume 467 , 2019 , Pages 43-50 ; 00119164 (ISSN) Amarloo, A ; Shafii, M. B ; Sharif University of Technology

Elsevier B.V 2019

Abstract

In this study, an experimental investigation of using the radiative cooling potential in a solar still was studied. Instead of using an auxiliary radiative panel, an integrated collector was utilized for both processes of absorption of solar radiations and emission of infrared radiations for radiative cooling. At night-time, the coldness was stored in the PCM inside the PCM-condenser. While during the day, the water was evaporated in an evaporation tank, the produced vapor was directed to the PCM-condenser and the air cooled-condenser. Different condenser configurations were tested to evaluate the effect of radiative cooling on daily yield and solar still efficiency. The lower temperature of...

Methylene Blue Removal from Contaminated Water by using Graphene Nano-Palte

, M.Sc. Thesis Sharif University of Technology Amarloo, Ehsan (Author) ; Shayegan, Jalaleddin (Supervisor)

Abstract

Organic dye couldn’t be treated by conventional method (biological method) due to their durable structure. In recent years, graphene based adsorbent has become more popular; this is because of high specific surface area and presence of numerous functional group on its surface. Due to the widespread application of organic dye in different industry especially in textile industry, stability and toxicity nature of them, finding an appropriate and cost effective method in treatment of this pollutant is very important. In this study, preparing and characterization of 3-D gel magnetic graphene oxide/kappa carrageenan was conducted and its ability of dye adsorption was tested. For this purpose, at...

Comparative Study on Enhanced Photocatalytic Activity of Visible Light-Active Nanostructures for Degradation of Oxytetracycline and COD Removal of Licorice Extraction Plant Wastewater

, Article Water (Switzerland) ; Volume 15, Issue 2 , 2023 ; 20734441 (ISSN) Zangeneh, H ; Mousavi, A ; Eskandari, P ; Amarloo, E ; Farghelitiyan, J ; Zamani, M. R ; Sharif University of Technology

MDPI 2023

Abstract

This study evaluates the effects of carbon, nitrogen, and sulfur dopants on the photocatalytic activity of TiO2 for degradation of oxytetracycline (OTC) and chemical oxygen demand (COD) removal from licorice extraction plant wastewater (LEPW). Three novel visible-light-responsive nanostructures, including L-Histidine-TiO2, L-Methionine-TiO2 and L-Asparagine-TiO2, were successfully synthesized. The results showed that the modification of TiO2 with these three amino acids made the catalyst active in the visible light region and reduced the recombination rate of e−/h+ pairs according to PL analysis. The photodegradation efficiency of L-Histidine (2 wt.%)-TiO2 was 100% and 94% for OTC and COD,...

Comparative study on photocatalytic performance of tio2 doped with different amino acids in degradation of antibiotics

, Article Water (Switzerland) ; Volume 15, Issue 3 , 2023 ; 20734441 (ISSN) Zangeneh, H ; Mousavi, S. A ; Eskandari, P ; Amarloo, E ; Farghelitiyan, J ; Mohammadi, S ; Sharif University of Technology

MDPI 2023

Abstract

In this study, three different reusable photocatalysts containing different amino acids as a source of non-metals, including L-Arginine, L-Proline, and L-Methionine, have been synthesized for the first time. Using a kinetic study and degradation efficiency test, these visible driven photocatalysts were investigated for their photocatalytic activity in removing antibiotics, including metronidazole (MNZ) and cephalexin (CEX). The morphology, structure and optical properties of the fabricated catalysts were characterized by X-ray Powder Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive Spectrometry (EDS)/mapping, Fourier-Transform Infrared Spectroscopy...

Genco's Bidding Strategy in Day-Ahead Energy Market Considering Demand Response

, M.Sc. Thesis Sharif University of Technology Kazemi, Mostafa (Author) ; Ehsan, Mehdi (Supervisor)

Abstract

Since 1980s the electricity market has been gradually evolving from a monopoly market into a liberalized one for encouraging competition and improving efficiency. This brings the opportunity for generation companies (Gencos) to make more proﬁts while embracing more risks of not being dispatched. Therefore, it has become a core interest for the Gencos to develop optimal bidding strategies to maximize the proﬁts and minimize the risks while participating in such a competitive market. Error of determining day-ahead electricity price is one of the sources of the risk. Energy price has a high impact on bidding strategy optimization process. So it should be determined with low error which is not...

Multi Objective Distributed Generation Planning in a Flexible Environment

, Ph.D. Dissertation Sharif University of Technology Soroudi, Alireza (Author) ; Ehsan, Mehdi (Supervisor)

Abstract

The process of deregulation that has involved electricity many markets has introduced several new interesting research topics in power system area. This thesis addresses one of the most fascinating issues among them: the study of distributed generation both renewable and conventional integration in distribution networks. From the distribution network operator (DNO)'s point of view, it is of interest to develop a comprehensive methodology which considers various distributed generation technologies as an option for supplying the demand in distribution networks. In this thesis, the planning problem has been multi-objectively modeled. This will help the planner in decision making while knowing...

, M.Sc. Thesis Sharif University of Technology Mahmoodzadeh, Zahra (Author) ; Ehsan, Mehdi (Supervisor)

Abstract

Losses are unavoidable in any parts of power systems, from generation to receiving nodes and occur in transmission and distribution networks. However, the main loss component is produced in distribution networks. Energy losses in distribution networks are about 70% of technological transport energy losses.
Energy losses in distribution networks are an important indicator for the planning and operation of the system. A fast, reliable and accurate energy loss calculation method is required for optimal operation of the distribution networks.
Energy loss depends on network's operating conditions. Loads values and loads factors are time variables; therefore, methods based on probability...

Methods of Clearing Reactive Power Market and Cost Allocation in Pool Structure

, M.Sc. Thesis Sharif University of Technology Kharraty, Saeed (Author) ; Ehsan, Mehdi (Supervisor)

Abstract

Restructuring and privatization in power system such as any industry leads to better market operation and more social welfare. Since two decade the power system in many countries have changed from monopoly to free market. In a restructured network the technical and economical aspects should be considered together. Ancillary services are needed for any power system to be operated in an optimal and secure manner. Reactive power and voltage regulation is one of the most important ancillary services in the network. this service should be supplied by its providers through a competitive market and system operator determines the optimal dispatch among different bids. The cost of purchasing reactive...

Dynamic Security Assessment in Restructured Power Systems

, Ph.D. Dissertation Sharif University of Technology Kheradmandi, Morteza (Author) ; Ehsan, Mahdi (Supervisor)

Abstract

This thesis addresses the problem of dynamic security assessment in power sys-tems with an emphasis on its application in restructured power systems and issues arising in its applications. The new electric utility environment has an immedi-ate consequence of emphasis on reliability and secure operation of power systems. This requires faster and more precise methods to assess the dynamic aspect of se-curity. On the other hand, this issue is becoming challenging when the determined dispatch might not be accommodated due to violation of the limits.This thesis addresses the problem of dynamic security assessment in power sys-tems with an emphasis on its application in restructured power systems...

Optimal Sizing and Operation of CHP Based on Stochastic Programming

, M.Sc. Thesis Sharif University of Technology Bozorg, Mokhtar (Author) ; Ehsan, Mehdi (Supervisor)

Abstract

CHP (Combined Heat and Power) generates electricity and thermal energy simultaneously from input fuel. Since it has high energy efficiency and low installation time, it is an appropriate approach in energy management of residential complexes. In this project, stochastic programming based on Monte Carlo approach is used to handle uncertainties in the optimal sizing of CHP for residential complexes. Availability of CHP, boiler and AC bus as well as the electrical and thermal load forecast errors are considered as stochastic variables. Minimizing system total cost considering the probability of each scenario obtained from the scenario reduction algorithm is the objective function. The system...

Planning of Energy Storage Systems with the Main Goal of Managing the Output Power of Wind Farms

, M.Sc. Thesis Sharif University of Technology Saber, Hossein (Author) ; Ehsan , Mehdi (Supervisor)

Abstract

Uncertain fuel prices and also global climate changes are accompanied by some state initiatives such as renewable portfolio standards (RPS). This has caused a fast growth in the amount of renewable energy installed worldwide especially wind energy over last decades. However, the intrinsic characteristics of wind farms output power, i.e. intermittency and volatility of wind speed along with being non-dispatchable in output generation of wind turbine raises many new technical and financial challenges for power system operators and planners. Up to these issues, large level of wind power penetration causes a growing concern in wind energy curtailment issue which the wind farm’s operator may be...

Retailer’s Medium-term Planning in Distribution Network Considering Uncertainty and Competitive Enviroment

, Ph.D. Dissertation Sharif University of Technology Kharrati, Saeed (Author) ; Ehsan , Mehdi (Supervisor)

Abstract

Electricity retailers are one of the power market entities which act as an intermediary between the producers in the wholesale market and the consumers in the retail side. The main task of a retailer in the power market is to set contract with the consumers to supply their electricity during a pre-specified time period and to participate in the wholesale market to supply the electricity needed by its costomers. Retailer’s contract with its customers may be a simple contract with a fixed pre-determined energy price or include some more complicated feathures such as involvement of a percent of green energy or variable price and demand response contracts. Moreover, retailer can supply its...

Scheduling of Retailers Performance in Electrical Energy Markets with Energy Production;Sell in Pool Market; and Demand Response Policies

, M.Sc. Thesis Sharif University of Technology Gilasi, Yasin (Author) ; Ehsan, Mehdy (Supervisor)

Abstract

Recent years of capitalism bold role and the competitive environment of variant fields of our life, sparking the idea which considers the electricity (one of the most crucial human requirement) as a commodity of a competitive market to be traded between confident subscribers by easy access. Therefore, by converting the exclusive structure of electricity supply system to a competitive one, some new roles are created to fulfill the electricity generation, transmission and distribution processes. Retail is one of the new roles, defined as a power system restructuring development helper by support of electricity trading, which can be involved in different transactions according to the market...

Linked Planning of Power Grids and Subsidy Policies on Using Photovoltaic Cells for Residential Electricity Supply

, M.Sc. Thesis Sharif University of Technology Balmaki, Saeed (Author) ; Ehsan, Mehdi (Supervisor)

Abstract

In recent years, due to restructuring in the electric power industry, distributed generation has become one of the most important subjects and DGs and renewable energy sources have been increasingly expected as a supplement and an alternative to a conventional large scale central power system. their success depends not only on the distribution of the available renewable energy sources in a region but also on the power grids connectable capacity in the area. Photovoltaic system is one of the best RESs for residential electricity supply because it is noiseless and solar power is widely available and households can use it via photovoltaic cells in their homes. There are two major problems...

Bidding and Offering Strategy of Hybrid Electric Companies in Day-ahead Energy Market

, Ph.D. Dissertation Sharif University of Technology Kazemi, Mostafa (Author) ; Ehsan, Mehdi (Supervisor)

Abstract

This Thesis presents a new approach for determining the day-ahead bidding strategies of a hybrid electric energy company. The company has both energy generation and energy retailing businesses in a competitive electricity market. Demand response programs are also considered in the retail side of the company in order to hedge the risk of participation in wholesale market. Price-taker and price maker companies are considered in this thesis separateky.For the price-taker hybrid structure, the predivtion of day-ahead prices are used to evaluate the optimum bidding and offering strategies. Also, day-ahead market price uncertainty is modeled, using non-probabilistic Information Gap Decision Theory...

Security Constrained Unit Commitment With Natural Gas Transmission Delivery Constraints

, M.Sc. Thesis Sharif University of Technology Badakhshan, Sobhan (Author) ; Ehsan, Mahdi (Supervisor)

Abstract

Natural gas power plant installed in power system as rapid start unit. In the recent decades, with increasing in the number of gas generating units in the world, consideration of natural gas transmission network in optimal solution of security-constrained unit commitment (SCUC) become a non-negligible problem. The gas transmission grid constraints integrated into the scheduling of thermal units in the proposed model for minimizes power system operating cost. In a power plant transmission of natural gas to power plant is very important because congestion in natural gas pipeline increases. This model could consider natural gas storage tank in gas transmission network as decision variable....

Distributed Generation Planning in Deregulated Electric Industry Using Multi-objective Optimization

, M.Sc. Thesis Sharif University of Technology Ahmadi, Mohammad (Author) ; Ehsan, Mehdi (Supervisor)

Expansion Planning of Active Distribution Networks in the Gradual PV
Increase

, M.Sc. Thesis Sharif University of Technology Khorshidi, Saman (Author) ; Ehsan, Mehdi (Supervisor)

Abstract

Due to the increasing influence of distribution generation , their effect in planning can't be ignord , especially solar panels ,which are incresing rapidly. The main purpose of this thesis is to an active distribution network that annually load bus and the amount of photovoltaic production in it increases and plan dynamically. In the planning that is done , uncertanty in the amount comsumption load and uncertanty in the pattern of sunlight and also annual innterest rates in the classical system we have planned by optimizing the network expansion costs , in addition to supplying the load bus, we can keep the voltage drop bus and line filling within the allowable . To do this , we considered...

Provisional Hybrid AC/DC Microgrid Planning

, M.Sc. Thesis Sharif University of Technology Mirzapour, Omid (Author) ; Ehsan, Mehdi (Supervisor)

Abstract

Renewable energy deployment through distributed energy resources is among the central goals of future power systems. Microgrids have proven to be an economically viable soloution for distributed energy resources integration into power system and benefit the customers with uninterrupted power supply. In this context provisional microgrids have been introduced with the main goal of rapid renewable energy sources deployment. Since a considerable portion of renewable enegy resources as well as residential loads are DC and this portion is expected to grow even further, hybrid AC/DC design of provisional microgrids can improve both efficiency and economic benefit by optimal arrangement of AC/DC...

Planning of Energy Storage Systems in the Restructured Environment by Considering Uncertainties

, M.Sc. Thesis Sharif University of Technology Barkom, Ehsan (Author) ; Ehsan, Mahdi (Supervisor)

Abstract

Energy storage is a pivotal technology to dealing with increasing demand for reliability and challenges of renewable energy integration. This thesis provides a benders decomposition framework for expansion studies of energy storage systems (ESSs) in high wind penetrated power system and uncertainties of wind farms expansion and wind speed. This work proposes probabilistic and robust approaches to determine the optimal location and size of storage devices to reduse wind curtailment. The proposed methodologies are implemented on the modified IEEE 73-bus test system and their anticipated applicability are compared to each other and well verified