Search for: heat-recovery
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    Exergy Analysis on Design of SMR Preheating Exchangers

    , M.Sc. Thesis Sharif University of Technology Shariati, Mohammad Hassan (Author) ; Farhadi, Fathollah (Supervisor)
    With the global oil price increase in recent years and fossil fuel resource scarcity, analyzing of fossil fuel consumer industries and optimization of their fuel consumption is an important rule. Exergy analysis is an efficient tool for this purpose in the chemical and petrochemical processes in recent years more than ever. Therefore, in this work, an exergy analysis is performed for heat recovery section of Steam-Methane Reforming (SMR) process as a major consumer of natural gas.
    This work contains five general section. At the first section, exergy and energy concepts, reforming processes and other related basic concepts are described. The second section is about the recent research and... 

    Optimal Model of Industrial Waste Heat Application in Desalination System: A Case Study of Hormozgan Province

    , M.Sc. Thesis Sharif University of Technology Yousefi, Paria (Author) ; Avami, Akram (Supervisor)
    Increasing population growth and scarcity of fresh water resources have created the challenge of water supply, especially in the Mena region. Thus, many countries in the region have turned to innovation in the development of high-energy seawater desalination technologies. Utilizing the waste heat of refineries in the desalination industry can reduce costs and preserve the environment. In this article, effective ways to use the waste heat of other flue recovery steam of Bandar Abbas oil refinery are investigated. The integration of the heat recovery system consisting of recuperative heat exchangers and heat pipes with thermal desalination plants is investigated by multi-stage flash and... 

    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) Sadeghi, E ; Khaledi, H ; Ghofrani, M. B ; The International Gas Turbine Institute ; Sharif University of Technology
    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... 

    Multistage recovering ventilated air heat through a heat recovery ventilator integrated with a condenser-side mixing box heat recovery system

    , Article Journal of Building Engineering ; Volume 24 , 2019 ; 23527102 (ISSN) Jafarinejad, T ; Shafii, M. B ; Roshandel, R ; Sharif University of Technology
    Elsevier Ltd  2019
    Recovering ventilated air heat in direct expansion (DX) HVAC systems has extensively been researched and many solutions have been introduced until now, such as air-to-air heat recovery ventilator (HRV) units. The ventilated air from building itself or an HRV unit, has heat recovery potentials yet to be exploited, owing to its lower temperature compared with the ambient. On the other hand, the thermal performance of the DX HVAC system's air-cooled condenser deteriorates in hot climates. Therefore, to improve the DX HVAC system and air cooled condenser thermal performance simultaneously, this study proposes and analyzes a novel integrated multistage heat recovery system that first recovers the... 

    Optimal Energy and Exergy Model of Waste Heat Recovery Systems in Cement Industry

    , M.Sc. Thesis Sharif University of Technology Ghadaksaz, Hesam (Author) ; Saboohi, Yadollah (Supervisor)
    Nowadays, cement has become the cornerstone of any modern society especially in developing countries. But, cement production process is highly energy intensive and emits significant volumes of carbon dioxide.According to the latest reports, Iranian cement industry accounts for about 14.5% of total industrial sector’s energy consumption and this indicates the importance of sustainable development for cement industry concerning national energy and environmental constraints.Based on these facts, current study assesses the technology improvement opportunities particularly waste heat recovery power generation (WHRPG) technology for Iranian cement industry. This needs identifying optimized mass... 

    Development of a Conceptual Model for Heat Recovery from Exhaust Gases of Electric Arc Furnace

    , M.Sc. Thesis Sharif University of Technology Mehrabi, Mohammad Reza (Author) ; Saboohi, Yadollah (Supervisor)
    Steel in Iran is mainly produced by EAFs. One of the most fundamental issues in the field of electric arc furnace is to foresight methods to reduce energy consumption and emissions. A model is presented in the present research work that avails itself to analysis of mass and energy recovery simultaneously. The proposed model includes three major elements: scrap pre-heating, sponge iron pre-heating and inert gases pre-heating. An important feature of this approach is to preheat sponge iron. Mathematical model for preheating scrap has been developed on the basis of CONSTEEL technology. Also the model for sponge iron and inert gases preheating has been formulated based on the literature review.... 

    Design and Development of an Alternative System of Recycling Exhaust Gas of a Direct Iron Reduction Furnace based on the Criterion of Minimum Destruction of Exergy and Water Usage

    , M.Sc. Thesis Sharif University of Technology Golkar, Babak (Author) ; Sobouhi, Yadollah (Supervisor) ; Ashjari, Mohammad Ali (Co-Advisor)
    Enormous amounts of water and energy are lost by scrubber utilization for furnace exhaust gas washing during direct iron reduction process. Hence, the aim of the current research is design and construction of a system which could be employed instead of scrubber within direct iron reduction process considering the equipment size constraints.To this end, the substitute system was manufactured after dimensional analysis and simulation of lab model compared to the prototype regarding the implementation limitations. The model has been tested in different operating conditions and empirical relations have been extracted for general analysis of direct iron reduction process. The case study here is... 

    Study and Modeling of CHP Systems in Power Plant

    , M.Sc. Thesis Sharif University of Technology Bagheri, Arash (Author) ; Bastani, Dariush (Supervisor)
    In the present study, a heat recovery system for a distributed generation plant (DG) with a 1 MW gas combustion engine has been designed. The purpose of this designing is converting the power plant to a CHP system. For the existing heat recovery system, a shell & tube heat exchanger is designed to recover the thermal energy from exhaust gases and a plate heat exchanger is designed to recover the thermal energy from the engine jacket cooling fluid. The heat exchanger design has been calculated manually and also by use of software. In the software calculation, the heat exchanger design has been done by use of the Aspen HTFS +2006.5 software. In the manual one, the Kern equation (1950) was... 

    Reliability Evaluation of Heat Recovery Steam Generator of Combined Cycle Thermal Power Plants

    , M.Sc. Thesis Sharif University of Technology Khaksar Haghani Dehkordi, Siamak (Author) ; Saeedi, Mohammad Hassan (Supervisor) ; Kazemzadeh Hannani, Siamak (Supervisor)
    Combined cycle power plants consist of three main sections, namely gas turbine, Heat Recovery Steam Generator (HRSG) and steam turbine. Occurring failure in HRSG causes the steam turbine trip, so the reliability assessment of HRSG has a great importance for forecasting the probability of occurring failure and also reducing failure causes. In this project, the reliability of HRSG considering effects of aging phenomenon, maintenance and, environmental and operational conditions on reliability is modeled. Afterward a method to estimate the model parameters is introduced. Using present method, failure data of six HRSGs of a plant each with a capacity of 50 MW is analyzed and the model parameters... 

    Simulation and Techno–Economical Analysis of an Improved Integrated Concentrated Photovoltaic/Organic Rankine Cycle System

    , M.Sc. Thesis Sharif University of Technology Moltames, Rahim (Author) ; Roshandel, Ramin (Supervisor)
    The combination of photovoltaic technology and Organic Rankine Cycle reduces the temperature of the solar panel and, on the other hand, generates separate electricity from excess heat. The reason for the use of the Organic Rankine Cycle is the low temperature of the heat source. It is not economical to use other cycles like steam Rankine cycle in low-temperature heat sources. To maximize the plant factor of the Organic Rankine cycle system, especially when there is not enough solar radiation, it is possible to utilize the flue gas heat recovery in office buildings and reduce the cost of electricity generation. In this project, the simulation of this system is carried out for the Energy... 

    Energy and exergy analysis of internal reforming solid oxide fuel cell-gas turbine hybrid system

    , Article International Journal of Hydrogen Energy ; Volume 32, Issue 17 , December , 2007 , Pages 4591-4599 ; 03603199 (ISSN) Bavarsad, P. G ; Sharif University of Technology
    The aim of this work is to analyze methane-fed internal reforming solid oxide fuel cell-gas turbine (IRSOFC-GT) power generation system based on the first and second law of thermodynamics. Exergy analysis is used to indicate the thermodynamic losses in each unit and to assess the work potentials of the streams of matter and of heat interactions. The system consists of a prereformer, a SOFC stack, a combustor, a turbine, a fuel compressor and air compressor, recuperators and a heat recovery steam generator (HRSG). A parametric study is also performed to evaluate the effect of various parameters such as fuel flow rate, air flow rate, temperature and pressure on system performance. © 2007... 

    An Agent-based Model for Sustainable Development of Optimal Industrial Symbiosis Networks

    , M.Sc. Thesis Sharif University of Technology Saghafi, Zohreh (Author) ; Roshandel, Ramin (Supervisor)
    Industrial symbiosis(IS) is a promising approach toward sustainable development goals. Among common modeling techniques, agent-based modeling holds a special place in IS simulation due to its bottom-up nature. However, the role of essential technologies in supply chain of IS has been poorly studied in the literature. In this work, first, an agent-base model is developed based on economic and environmental incentives of IS stakeholders employing optimization and non-cooperative game theory. Then, essential technologies in each potential symbiotic relation are integrated into the model to investigate their impact. The result suggests, to facilitate IS through environmental policy making, on... 

    Thermoeconomic approach for optimal design of gas turbine heat recovery steam generator

    , Article Proceedings of the 26th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2013 ; July , 2013 Hanafizadeh, P ; Parhizgar, T ; Ghorbanian, K ; Sharif University of Technology
    China International Conference Center for Science and Technology  2013
    In the present study a comprehensive thermoeconomic modelling of a heat recovery steam generator (HRSG) for a typical 4MW class gas turbine is performed. Usually, the thermoeconomic analyses involve a thermodynamic model of the HRSG and an economic model dedicated to assess the cost. In this study, different configurations of single and dual pressure level HRSGs are optimized and afterward compared to find the economical design. For these configurations thermodynamic model calculates the performance and the energy balance of systems at the optimal operating conditions which are derived from optimization model, and economic model estimates total cost per unit of produced energy. Finally,... 

    Model for Optimal design of Energy Recovery System in Cement Plant

    , M.Sc. Thesis Sharif University of Technology Ehsani, Mahdi (Author) ; Sabouhi, Yadollah (Supervisor)
    The purpose of the present study is to develope an optimal model for analysis the impact of implementing a heat recovery system in a cement production line. For this goal, the energy reference system of a cement plant has been prepared, mass and energy balance sheets of the cement factory with dry production method, the characteristics of two high-energy streams have been identified in order to estimate the potential of heat recovery. Regarding the temperature range of the main hot streams, an appropriate cycle for generating electrical power from the lost heat, the Rankine cycle with organic fluid (ORC) has been formulated. The main question in the present project was how to relate the... 

    Design and Analysis of an Improved System for Recovering Ventilated Air Heat in DX HVAC Systems

    , M.Sc. Thesis Sharif University of Technology Jafarinejad, Tohid (Author) ; Roshandel, Ramin (Supervisor) ; Shafiei, Mohammad Behshad (Co-Advisor)
    In the last three decades, the world has experienced enormous increases in energy consumption as a consequence of the economic and population growth. This causes renewable energy and energy recovery to become a requirement in building designs rather than option. A direct expansion (DX) air conditioning system is an efficient way to supply fresh and dehumidified air to a built environment a long side it plays a key role in preventing the spread of respiratory diseases. To improve the efficiency of a conventional DX system in hot and humid regions, fresh air dehumidification and conditioning systems with energy recovery measures are the key equipment to reach such a goal. To achieve this goal... 

    Feasibility Study and Modelling of Using Absorption Refrigeration System for Recovering Heat in Oil and Gas Industry

    , M.Sc. Thesis Sharif University of Technology HeidariMohghadam, Hamid Reza (Author) ; Sattari, Sorena (Supervisor)
    By growing the global demand for energy and use the fosil fuel for it by knowing the issue of increase in their resourses؛ it’s important to use new technologies for these energies in an optimum way.
    Most of industrial process uses a lot of thermal energy by burning fossil fuel to produce steam or heat for the purpose. One of the most important processes that use energy is refrigeration. After these processes, heat is rejected to the surrounding as waste. This waste heat can be converted to a useful refrigeration by using a heat operated refrigeration system, such as an absorption refrigeration cycle. This can be a useful pattern to improve thermal efficiency of process and reduce its... 

    Technical and Economic Assessment Of a Symbiosis Opportunity for Utilization of Power Plants-Sourced Waste Heat to Supply Greenhouses Demand Considering Spatial Configuration

    , M.Sc. Thesis Sharif University of Technology Geramian Nejjad, Ali (Author) ; Roshandel, Ramin (Supervisor)
    The main purpose of this research is analyzing the energy stream of clean food production by using Iran's power plants sourced waste heat. In order to achieve this goal, at first, greenhouse heating demand model according to the type of crops and geographic location of greenhouse, heat transport from power plant to greenhouse model, and heat exchanger model is presented. Then, the potential of constructing clean greenhouse around power plants has been evaluated by using the concept of industrial symbiosis and by integrating greenhouse energy demand, waste heat transport, and heat exchanger models into industrial symbiosis concept framework and also by economical and geographical assessments.... 

    Heat recovery of exhaust gas in automotive paint ovens

    , Article 23rd International Conference on Efficiency, Cost, Optimization, Simulation, and Environmental Impact of Energy Systems, ECOS 2010, Lausanne, 14 June 2010 through 17 June 2010 ; Volume 5 , 2010 , Pages 381- ; 9781456303204 (ISBN) Hanafizadeh, P ; Khaghani, A ; Shams, H ; Saidi, M.H ; Ecole Polytechnique Federale de Lausanne; Schweizerische Eidgenossenschaft ; Sharif University of Technology
    Aabo Akademi University  2010
    The rising cost of energy and the global warming in recent years have highlighted the need of more advanced systems with higher efficiency and less gas emissions. Consequently, plenty of researches have done on waste heat recovery and renewable sources of energy recently. The target of the present research is feasibility study of heat recovery in automobiles' paint ovens and designing an efficient system to use the lost energy. Research has been carried out on the theory, evaluating the amount of lost and available energy through Thermodynamics and heat transfer principle and choosing applicable design and construction of heat exchanger, especially for their use in ovens for energy recovery,... 

    Thermodynamic analysis of application of organic Rankine cycle for heat recovery from an integrated DIR-MCFC with pre-reformer

    , Article Energy Conversion and Management ; Volume 67 , 2013 , Pages 197-207 ; 01968904 (ISSN) Vatani, A ; Khazaeli, A ; Roshandel, R ; Panjeshahi, M. H ; Sharif University of Technology
    This work deals with waste heat recovery from a proposed direct internal reforming molten carbonate fuel cell (DIR-MCFC), including an integrated pre-reformer. In this regard, some advantages are attainable over exhaust gas recycling. For instance, due to low temperature in the pre-reformer, carbon deposition and coke formation resulting from higher hydrocarbons can be eliminated. In this study, the cathode outlet provides the heat requirement for the pre-reforming process. After partial heat recovery from the cathode outlet, the stream still has a considerable energy and exergy (352.55 °C and 83.687 kW respectively). This study investigates waste heat recovery from the proposed DIR-MCFC,... 

    Second law based analysis of supplementary firing effects on the Heat Recovery Steam Generator in a combined cycle power plant

    , Article ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010, 12 July 2010 through 14 July 2010, Istanbul ; Volume 1 , 2010 , Pages 201-209 ; 9780791849156 (ISBN) Karrabi, H ; Rasoulipour, S ; Sharif University of Technology
    The supplementary firing is one of the techniques which are used to increase the output power of the combined cycle power plants (CCPP). The low construction cost per generated power encourages designers to consider it in the new CCPP. In this paper the thermal and exergy analyses of HRSG for various operating conditions in variation of loads and variation of ambient temperature carried out. They are based on the performance test data at different operating conditions. The objective of these analyses is to present the effects of supplementary firing on gross power output, combined cycle efficiency and the exergy loss in Heat Recovery Steam Generator (HRSG) devices at different ambient...