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    Experimental Study of Common Refrigerants Replacement with Hydrocarbon Mixture in Automotive Air Conditioning System

    , M.Sc. Thesis Sharif University of Technology Fathi, Davood (Author) ; Soltanieh, Mohammad (Supervisor)
    Abstract
    Due to the environmental concern for the harmful effect of the release of HFCs on global warming there has been more interest for the use of hydrocarbons as refrigerants in recent years. In this project the performance of these refrigerants have been studied and compared with common refrigerants from the quantitative and qualitative point of view using a real-scale model of Peugeot-405 air conditioning system. Charging amount, inside temperature, cooling load, energy consumption of cycle, coefficient of performance and required time to steady state condition are the important comparative criteria for such a study. After carrying out a series of tests it has been considered that charge... 

    Evaluation of the Endpoint Damage of Climate Change Due to Power Plant Emissions on the Human Health Using Life Cycle Analysis

    , M.Sc. Thesis Sharif University of Technology Mirzaee, Saeed (Author) ; Avami, Akram (Supervisor)
    Abstract
    Preserving and promoting the health of citizens in a society is one of the most important problems addressed in any country. The power sector discharges a huge volume of carbon dioxide which intensifies the climate change and consequent human health problems.The goal of this study is to evaluate the ultimate effect of climate change caused by power plant emissions on the human health using life cycle analysis approach for different provinces in Iran. An integrated model has been developed to evaluate the impact of climate change due to power plant emissions on the human health. This model includes the equations regarding the variations in carbon dioxide concentration in the atmosphere,... 

    Hydrogen distribution in refinery with non-linear programming

    , Article International Journal of Engineering, Transactions B: Applications ; Volume 18, Issue 2 , 2005 , Pages 165-176 ; 1728-144X (ISSN) Shahraki, F ; Kashi, E ; Rashtchian, D ; Sharif University of Technology
    Materials and Energy Research Center  2005
    Abstract
    Growth of the world population, increasing demand for fossil fuel consumption and consequently increasing threat of global warming, has extended the need for production and use of clean fuels and normal hydrogen is an important utility in the production of clean fuels. In this paper, a mathematical optimization method is applied which is based on non-linear programming of superstructure for minimizing the consumption of hydrogen. The method considers all the pressure constraints and is suited for revamping industrial systems. The optimum placement of new equipments like purification unit has been also considered. It is tried to verify the method adopted, in addition, an industrial case study... 

    Drag reduction ability of slippery liquid-infused surfaces: A review

    , Article Progress in Organic Coatings ; Volume 170 , 2022 ; 03009440 (ISSN) Pakzad, H ; Nouri Borujerdi, A ; Moosavi, A ; Sharif University of Technology
    Elsevier B.V  2022
    Abstract
    Devising effective methods to reduce drag forces is of great interest as these methods could prevent the wastage of fuel and decrease carbon emission and the global warming rate. Since the invention of Liquid-Infused Surfaces (LISs) in 2011, numerous investigations have been conducted to study their capability in various applications. Due to recirculation or drawing of the penetrated liquid within the surface structure, these surfaces acquire a slippiness property. The conducted investigations showed that these slippery surfaces have great potential for reducing drag forces, whether in a laminar or turbulent flow. In the present work, we first briefly elucidate common drag reduction methods,... 

    Quantification of technological progress in greenhouse gas (GHG) capture and mitigation using patent data

    , Article Energy and Environmental Science ; Volume 12, Issue 9 , 2019 , Pages 2789-2805 ; 17545692 (ISSN) Sharifzadeh, M ; Triulzi, G ; Magee, C. L ; Sharif University of Technology
    Royal Society of Chemistry  2019
    Abstract
    Greenhouse gas emissions from anthropogenic sources are believed to be the main cause of global warming and climate change. Furthermore, fossil fuels are forecasted to remain the dominant source of energy in the near future. Therefore, capture and sequestration of greenhouse gases and in particular carbon dioxide is likely to be a major pathway toward environmental protection and energy sustainability. Such clarity has stimulated an intense and diverse range of research into various capture and mitigation technologies, which race with global warming in real-time. Quantification of the performance improvement rates of these technologies can inform decision-makers' long-term investment... 

    A Novel, eco-friendly combined solar cooling and heating system, powered by hybrid Photovoltaic thermal (PVT) collector for domestic application

    , Article Energy Conversion and Management ; Volume 222 , 2020 Zarei, A ; Liravi, M ; Babaie Rabiee, M ; Ghodrat, M ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    Solar heating and cooling technologies can have a vital role to play in understanding the targets in energy security, economic development, and mitigating climate change. This study aimed to investigate the performance of the combined solar cooling/heating system using a Photovoltaic Thermal collector (PVT) for residential applications. The main advantage of using PVT is the conversion of the maximum amount of solar energy into electricity and thermal energy. In this work, water is used to cool the panel and, consequently, increase the efficiency. The cooling cycle comprises a hybrid ejector-compression refrigeration cycle with two evaporator temperatures. To reduce the effect of the global... 

    Building circularity as a measure of sustainability in the old and modern architecture: A case study of architecture development in the hot and dry climate

    , Article Energy and Buildings ; Volume 275 , 2022 ; 03787788 (ISSN) Hosseini Honarvar, S. M ; Golabchi, M ; Bararzadeh Ledari, M ; Sharif University of Technology
    Elsevier Ltd  2022
    Abstract
    Nowadays, the construction industry has turned to the consumption of large amounts of natural resources in line with global population growth, which has led to the shortage of resources, and consequently increases in the construction debris; therefore, the present article has studied the positive and negative points of the architectural development process. The results have indicated that being compared to the former architecture; the development of architecture has reduced energy consumption by 78%. Hence, the scarcity of virgin resources and consequently the increase of environmental effects such as Global Warming Potential (GWP) have been measured based on the Life Cycle Assessment (LCA).... 

    Process Design of Ionic Liquid-Based CO2 Capture with Consideration of Economic and Environmental Issues

    , M.Sc. Thesis Sharif University of Technology Eidi, Ali (Author) ; Rashtchian, Davood (Supervisor) ; Adibi, Mina (Co-Supervisor)
    Abstract
    Concerns have increased about global warming caused by CO2 emissions in the atmosphere. At the moment, carbon capture and storage is the best available solution. Among the current technologies for CCS, amine-based chemical absorption appears to be the most common method. Amines show several inherent drawbacks such as high vapor pressure, high energy consumption in regeneration, corrosivity and degradability. So, researchers have developed new solvents with the foresight of being superior to amines. Ionic liquids (ILs) are among the most suitable alternatives. The most prominent feature of ILs is their tunable thermophysical properties. In this work, physical absorption by ILs is chosen as... 

    A survey on the effect of different kinds of wind turbines on power system stability

    , Article 2010 1st International Nuclear and Renewable Energy Conference, INREC'10, 21 March 2010 through 24 March 2010 ; March , 2010 ; 9781424452149 (ISBN) Bahramipanah, M ; Afsharnia, S ; Shahooei, Z ; Sharif University of Technology
    2010
    Abstract
    Due to deterioration of fossil fuel and policy directives on greenhouse gas mitigation, wind power generation has been widely developed in recent years. This has raised many issues in terms of power system operation, dynamics, stability and etc. This paper reviews the effect of different kinds of wind turbines on power system stability. Since there are no existing surveys in this area, it provides a comprehensive overview in transient and dynamic stability. The contribution of this survey is to provide a comparison to determine which kinds of wind turbines is better from the system stability point of view. Furthermore, the effects of wind power generation with energy storage systems are... 

    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
    Abstract
    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,... 

    Resilient approach toward urban development in lake catchments; case of Lake Urmia

    , Article Scientia Iranica ; Volume 23, Issue 4 , 2016 , Pages 1627-1632 ; 10263098 (ISSN) Ahmadi, A ; Abbaspour, M ; Arjmandi, R ; Abedi, Z ; Sharif University of Technology
    Sharif University of Technology  2016
    Abstract
    The climate change and human development in lake catchments have put these habitats in drying conditions, e.g. Aral Sea in Asia, Lake Chad in Africa, Lake Mead in USA, Lake Urmia in Iran, etc. These ecosystems play an important role in social, ecological, and economic activities. Lake Urmia, recognized as an international wetland in 1973 and located in Iran, which is the second largest hypersaline lake in the world, is in the same state. Lake Urmia biologically and ecologically is one of the most interesting places in the world. This lake is a habitat for various species. The lake's surface has shrunken from 6000 km2 to 900 km2 in 2013. The statistics indicate that the population has... 

    Multi objective planning for sustainable retrofit of educational buildings

    , Article Journal of Building Engineering ; Volume 24 , 2019 ; 23527102 (ISSN) Soleimani Javid, A ; 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... 

    Comparative assessment of bioethanol supply chain: insights from Iran

    , Article Biofuels ; Volume 12, Issue 4 , 2021 , Pages 475-483 ; 17597269 (ISSN) Haj Hasan, A ; Avami, A ; Sharif University of Technology
    Taylor and Francis Ltd  2021
    Abstract
    Biofuels are important alternative fuel in recent years. In this work, the bioethanol supply chain planning is performed by BioEnergy Supply Model to optimally find the best pathways using economic and environmental objective functions in Iran. Then, different sustainability criteria focusing on environmental, economic, and social concerns are assessed for possible routes of the bioethanol production from available resources. Although agriculture residues and wastes, decrease the greenhouse gas emissions but municipal solid wastes are more economic and require less water. The agricultural wastes and residues improve the sustainability. Then, criteria focusing on environmental, economic, and... 

    Photocatalytic reforming of biomass-derived feedstock to hydrogen production

    , Article Research on Chemical Intermediates ; Volume 48, Issue 5 , 2022 , Pages 1793-1811 ; 09226168 (ISSN) Akhundi, A ; Naseri, A ; Abdollahi, N ; Samadi, M ; Moshfegh, A ; Sharif University of Technology
    Springer Science and Business Media B.V  2022
    Abstract
    Worldwide energy and environmental issues are forcing researchers to develop a green approach to produce a clean energy. However, traditional methods in reforming of fossil fuels to produce hydrogen (H2) are causing CO2 emission. Hydrogen is therefore an indirect greenhouse gas with a global warming potential. Hydrogen with high specific energy density can be considered as an efficient energy carrier as compared to fossil fuels. But hydrogen production from water splitting reaction has low efficiency, which limits its generation by green approach. For addressing this issue, different chemical hole scavengers have been applied, which is causing further environmental and economic problems. By... 

    Determination and prioritization of criteria to design urban energy resilience conceptual model (Part 1)

    , Article International Journal of Environmental Science and Technology ; Volume 19, Issue 5 , 2022 , Pages 3593-3606 ; 17351472 (ISSN) Mohaghegh Zahed, L ; Abbaspour, M ; Ghodoosi, J ; Sharifi, A ; Sharif University of Technology
    Springer Science and Business Media Deutschland GmbH  2022
    Abstract
    Nowadays, around 70% percent of global energy usage is consumed in urban areas. Undoubtedly, this figure will increase in coming decades due to population rise. As a result, energy resiliency can be considered as an important issue in urban context. Resilience of energy supply in urban areas can be categorized in two approaches, short-term and long-term. Short-term applies to cope with threats such as earthquakes and floods, and long-term applies to deal with impacts of climate change on global warming. In this study, literature review was applied to design questionnaire for expert survey, followed by Fuzzy analytic hierarchy process method to categorize 34 sub-criteria divided under four... 

    Modeling carbon dioxide emission of countries in southeast of Asia by applying artificial neural network

    , Article International Journal of Low-Carbon Technologies ; Volume 17 , 2022 , Pages 321-326 ; 17481317 (ISSN) Komeili Birjandi, A ; Fahim Alavi, M ; Salem, M ; Assad, M. E. H ; Prabaharan, N ; Sharif University of Technology
    Oxford University Press  2022
    Abstract
    Energy and economy play a substantial role in environmental issues such as the emission of greenhouse gases. CO2 is one of the greenhouses that is hugely produced in industrial processes and other human being activities. The major share of CO2 emission is related to the energy-related activities. As a result, modeling the amount of produced CO2 by utilization of different energy sources must be considered. Moreover, by considering economic indicators such as gross domestic product, the accuracy of the model could be improved. In the present work, artificial neural network (ANN) with two transfer functions including normalized radial basis and tansig is used to model CO2 production of... 

    Design and Optimization of Carbon Capture System from Exhaust Gases in the Process Industries

    , M.Sc. Thesis Sharif University of Technology Farshi Taghavi, Mahdis (Author) ; Rashtchian, Davood (Supervisor) ; Seif, Shayan (Co-Supervisor)
    Abstract
    Carbon dioxide is one of the main geenhouse gases emitted from factories as well as transportation vehicles that adversely affect the atmosphere and cause global warming. Among the proposed solutions to reduce carbon dioxide in the atmosphere, carbon dioxide separation would be the most viable medium-term approach. However, the high cost of carbon dioxide separation prevents the development of carbon dioxide absorption technologies. Therefore, it seems that integrating separation and production processes is the most efficient way to save energy and reduce carbon emissions. This method decrease a high proportion of the energy consumption in upstream operations (carbon dioxide removal,... 

    Analysis and interaction of exergy, environmental and economic in multi-objective optimization of BTX process based on evolutionary algorithm

    , Article Energy ; Volume 59 , 2013 , Pages 147-156 ; 03605442 (ISSN) Sahraei, M. H ; Farhadi, F ; Boozarjomehry, R. B ; Sharif University of Technology
    2013
    Abstract
    In this paper sustainability analysis (exergy, environmental and economic) and multi-objective optimization for an aromatic plant are provided and interactions between decision variables are discussed. Environmental evaluation shows that the cancer human toxicity and global warming are the most important environmental concerns and the weight of EIs (environmental impacts) are mainly due to process wastes. The optimizations results demonstrate parameters like reactor temperature have a wide range in the optimizations while some variables, such as extraction unit variables have the same value. Utility EI reduction occurred in economic and exergy optimizations rather than environmental... 

    Dual catalytic function of the task-specific ionic liquid: Green oxidation of cyclohexene to adipic acid using 30% H2O2

    , Article Chemical Engineering Journal ; Volume 221 , April , 2013 , Pages 254-257 ; 13858947 (ISSN) Vafaeezadeh, M ; Hashemi, M. M ; Sharif University of Technology
    2013
    Abstract
    The sole industrial process which currently used for adipic acid production is nitric acid oxidation of either cyclohexanol or cyclohexanol/cyclohexanone mixture. Emission of greenhouse nitrous oxide (N2O) gas from this process strongly contributes to global warming, resulting in acid rain and ozone depletion. Herein, we report a catalytic application of a novel dual task-specific ionic liquid (an ionic liquid with two catalytic functions) for oxidation of cyclohexene to adipic acid using 30% hydrogen peroxide. The catalyst showed desirable activity toward oxidation of cyclohexene and some cyclic olefins to produce their corresponding dicarboxylic acids  

    Energy consumption criteria and labeling program of wet cooling towers in Iran

    , Article Energy and Buildings ; Volume 43, Issue 10 , October , 2011 , Pages 2712-2717 ; 03787788 (ISSN) Saidi, M. H ; Sajadi, B ; Sayyadi, P ; Sharif University of Technology
    2011
    Abstract
    Increasing concerns about the lack of energy resources, global warming and environmental pollution have pushed the relevant organizations to develop energy saving strategies such as energy labeling programs. In this research, a new energy labeling program is developed and evaluated for the wet cooling towers in Iran. The cooling tower parameters, including its cooling capacity and the fan power consumption, are measured using an experimental setup. The experimental data are standardized to compensate the effect of the ambient wet bulb temperature on the cooling tower performance which cannot be controlled during the experiments. The results show that the cooling tower capacity and the fan...