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Modeling and Optimization of Solid Waste Application in Combined Heat and Power System
, M.Sc. Thesis Sharif University of Technology ; Roshandel, Ramin (Supervisor)
Abstract
increasing energy demand and emission of environmental pollutant as a result of using fossil fuels and increase in waste generated due to human activities resulted in considering this source as a partial substitute for fossil resources in power application . Hence in this project biomass is considered as source of energy for heat and power application. Having low quality energy is the most important difficulty for application this resource as an energy carrier, so, gasification is applied to convert this source to gas with higher quality one. Produced gas in gasification enters to a micro turbine to meet thermal and electrical demand of the Sharif energy research institute. To investigate...
Thermodynamic analysis of different configurations for microturbine cycles in simple and cogeneration systems
, Article 2006 ASME 51st Turbo Expo, Barcelona, 6 May 2006 through 11 May 2006 ; Volume 5 PART A , 2006 , Pages 247-255 ; 0791842401 (ISBN); 9780791842409 (ISBN) ; Khaledi, H ; Ghofrani, M. B ; The International Gas Turbine Institute ; Sharif University of Technology
2006
Abstract
In recent years, the development of distributed power generation has resulted in significant reduction in network losses and transmission costs while it has increased reliability. Microturbine is one of these power generators that has the ability of relatively high power generation in spite of its small volume [1], [2]. In this paper, different layouts for advanced microturbine cycles are analyzed. In order to modify cycle characteristics such as power and efficiency, and reduce exergy destruction, different configurations including intercooler, aftercooler, and heat recovery boiler are separately and synthetically analyzed and compared. The effects of various parameters, such as compressor...
Designing of Integrated Polygeneration System of Heating, Power and Carbon Dioxide in Urban Wastewater Treatment Plants
, M.Sc. Thesis Sharif University of Technology ; Avami, Akram (Supervisor)
Abstract
With the growing development of urban communities and population, the demand for water and treated sewage water has grown significantly. The environmental damage of polluted water has resulted in passing of new and strict environmental laws on wastewater discharge recently. In the present research, a hybrid system involving a power, heat and cool cogeneration and a carbon dioxide capture system has been designed for a typical wastewater treatment plant. The plant is optimized from economic and environmental criteria. The anaerobic digester is modeled using the ADM1 model. The biogas is directed into the hydrogen sulfide removal filter to remove the impurities and into the heat exchanger to...
Feasibility Analysis of Radial Outflow Turbine in Microturbine
, M.Sc. Thesis Sharif University of Technology ; Ghorbanian, Kaveh (Supervisor)
Abstract
It has been well documented over the years that axial and radial inflow turbines have traditionally been the solutions of choice for organic Rankine cycles. Recently, the advantages of radial outflow turbines in various operating conditions of the organic Rankine cycle have been highlighted. However, no research has been done on the use of this type of turbine in other cycles and for relatively high cycle pressure and temperature conditions. Further, there is no information on the design process of radial outflow turbines in the open literature. The purpose of this research is to compile a relatively accurate process of designing a radial outflow turbine and the feasibility of using it in a...
Improving Design of a Cross-Flow Turbine Based on Manufacturing and Testing The Prototype Turbine
, M.Sc. Thesis Sharif University of Technology ; Durali, Mohammad (Supervisor)
Abstract
Electric power is considered as one of the prerequisites of development in many countries. In recent years distributed electric power generation has attracted much attention. Small hydro potentials are considered as the most economical method of harvesting renewable energy and a suitable solution for earning income.In the last two years, a project was defined for Sharif University of Technology by Iran hydro-power authorities with the goal of spotting hydro potentials and design, manufacture and installation of three types of micro hydro powerplants for the first time in Iran. One of these powerplants use a micro Cross-Flow turbine. Although the prototype manufactured for this project is a...
Energy and Economic Analysis of Micro CHP Systems in Buildings
, M.Sc. Thesis Sharif University of Technology ; Sattari, Sourena (Supervisor)
Abstract
In recent decades, due to economic, political and environmental issues, tend to use of the CHP systems (combined heating and power) have increased. CHP systems not only increase energy efficiency, but also decrease fuel consumption and emission levels of systems. The use of CHP technology in the industry has a long history, but the use of these systems in the commercial and residential sector, is considered, recently. As to the residential buildings, both electricity and thermal energy demands fluctuate seasonally and hourly, so it is necessary to take account of the plant’s annual operational strategies for the variations of load demands. In this paper, a nonlinear programming model is...
Energy and Thermoeconomic Modeling CHP System in Order to Choose between Micro-Turbine and Internal Combustion Engine as the prime Mover
, M.Sc. Thesis Sharif University of Technology ; Sattari, Surena (Supervisor)
Abstract
In this project, a co-generation system with the operation capacity of less than 1000 kilowatts has been studied. The main purpose of this project is to help decision makers in order to choose proper combination of micro turbines and/or reciprocating engines, with certain rating capacity, as the prime movers of this co-generation system. Some factors that have been considered in the decision making process are prime mover operation in various ambient temperatures, various altitudes and part-load conditions and also operational restrictions such as power to heat ratio, maintenance cost ratio and prime movers plant factor and also economic characteristics such as investment and operating cost...
Design and 1D Dynamic Modeling of an Axial-Centrifugal Compressor Matching
, M.Sc. Thesis Sharif University of Technology ; Ghorbanian, Kaveh (Supervisor)
Abstract
Overall performance improvement of gas turbine is available by modifying each component of cycle. The purpose of this research is to improve performance of a micro turbine with 200 KW power, by redesigning compressor set. Considerable increase in performance and stability occurs, by adding individual stage of axial compressor at the entry of centrifugal section. It should be noted that, this improvement occurs without a significant increase in size and without having to change the centrifugal compressor design.In this study, design of one stage axial compressor and three dimensional modeling is discussed after, modeling and preliminary design of centrifugal compressor. Then, after obtaining...
Development of Integrated Model of the Wastewater and Organic Solid Waste Flows to Minimize Environmental Impacts and Maximize Energy Recovery for a Residential Building
, M.Sc. Thesis Sharif University of Technology ; Avami, Akram (Supervisor)
Abstract
Nowdays much of the organic solid waste and wastewater is buried using centralized and traditional methods. This leads to many problems, including groundwater pollution, methane emissions into the atmosphere and rapid transmission of disease. In order to avoid these problems, using a decentralized approach can be a good solution. In this study, recovery of organic waste and wastewater of residential buildings using anaerobic digester as a decentralized way, have been examined. Using experiments, the optimum mass ratio of organic solid waste and wastewater is obtained as 80% and 20% respectively. Biogas production model is developed using mass balance and Balance of electrons in redox...
Modeling of a Hybrid Solid Oxide Fuel Cell Microturbine System with Steam Injection
, M.Sc. Thesis Sharif University of Technology ; Morad, Mohammad Reza (Supervisor)
Abstract
Hybrid Solid Oxide Fuel Cell-Micro Gas Turbine systems(SOFC-MGT) present opportunities for improvement over conventional systems, including high efficiency, cogeneration, and the potential for low carbon emmisions. In order to advance toward commercialization, Hybrid systems need to model under design point and off-design situations that maintain safe and efficient operations, also exhibiting favorable exergetic and economic performance. The present work investigates the hybrid SOFC-MGT performance and effects of steam injection, humidity effect, and fuel change in the system. The 1-D model of SOFC stack has been developed in EES Code and then coupled with a microturbine’s components with...
Design and Modeling of a Solar Combined Cooling, Heating and Power System and it’s Validation with Empirical Results
, M.Sc. Thesis Sharif University of Technology ; Saboohi, Yadollah (Supervisor)
Abstract
Due to the growth of energy consumption the use of new technologies and efficient energy conversion is necessary. An example of efficient energy conversion technology is CCHP (Combined Cooling, Heating and Power). The aim of the present research work is to develop a model that could be applied for optimal design of a hybrid CCHP system which would be Solar Combined Cooling, Heating and Power (SCCHP). In order to do so,microturbine power system, cooling and heating equipment’s such as absorption system and heat exchanger and also solar collector have been considered as an integral part of the system. The objective of the application of the model has been to identify proper sizing of all...
Recuperator Design of a 100kW Aviation Gas Turbine and its Integrated Performance Analysis with the Aircraft
, M.Sc. Thesis Sharif University of Technology ; Ghorbanian, Kaveh (Supervisor)
Abstract
The increasing need for more efficient and environmentally friendly microturbines necessitates the utilization of compact recuperators resulting in lower fuel consumption and emissions. The goal of this research is to determine the performance behavior of a primary surface recuperator to be incorporated in a 100 kW microturbine. Primary surface recuperator, known for relatively favorable characteristics in heat transfer, low weight, and high efficiency is considered as a candidate in aviation engines. In this research, a computational model for heat transfer and pressure losses is used for the design optimization of annular involute-profile cross wavy primary surface recuperators in...
A generalized technique of modeling, analysis, and control of a matrix converter using SVD
, Article IEEE Transactions on Industrial Electronics ; Volume 58, Issue 3 , 2011 , Pages 949-959 ; 02780046 (ISSN) ; Mokhtari, H ; Chang, L ; Sharif University of Technology
Abstract
In this paper, a new simple and complete technique of modeling and analysis of a matrix converter is presented based on the singular value decomposition (SVD) of modulation matrix. The proposed modeling method yields a new limitation between the matrix converter gain and its input power factor, which is more relaxed as compared to the limits reported so far in the literature. The SVD of the modulation matrix leads to a unified modulation technique which achieves the full capability of a matrix converter. It is shown that this approach is general and all other modulation methods established for a matrix converter are specific cases of this technique. The proposed modulation method can be used...
A comprehensive thermo-economic analysis, optimization and ranking of different microturbine plate-fin recuperators designs employing similar and dissimilar fins on hot and cold sides with NSGA-II algorithm and DEA model
, Article Applied Thermal Engineering ; Volume 130 , February , 2018 , Pages 1090-1104 ; 13594311 (ISSN) ; Sadeghi, S ; Khanjarpanah, H ; Haghshenas Gorgani, H ; Sharif University of Technology
Elsevier Ltd
2018
Abstract
This study aims to perform a comprehensive thermo-economic analysis, optimization and ranking of cross and counter-flow plate-fin recuperators employing rectangular, triangular, offset strip and louver fins. The analysis is mainly conducted for two recuperator structures: (i) fins’ configurations on both hot and cold sides are the same; (ii) fins on hot side and cold side are dissimilar in configuration. Considering effective practical optimization constraints and design parameters, Non-dominated Sorting Genetic Algorithm (NSGA-II) is used to maximize the recuperator effectiveness and minimize its total cost, simultaneously. Pareto-optimal fronts are presented to specify the desirable...