Loading...
Search for: ghaebi--hadi
0.152 seconds

    Integration of an absorption chiller in a total CHP site for utilizing its cooling production potential based on R-curve concept

    , Article International Journal of Refrigeration ; Volume 35, Issue 5 , 2012 , Pages 1384-1392 ; 01407007 (ISSN) Ghaebi, H ; Karimkashi, S ; Saidi, M. H ; Sharif University of Technology
    2012
    Abstract
    Total site integration offers energy conservation opportunities across different individual processes. It also helps for design as well as optimization of the central utility system. It gives massive energy-saving opportunities. The large industrial CHP sites generate heat and power simultaneously. These sites have different steam levels at different pressures which are used for power generation via steam turbines and also directly for satisfying process heat demand. There are many sites requiring cooling demand in hot seasons. In this article, integration of a LiBr/water absorption chiller in a CHP site has been investigated until its cooling demand is satisfied. Low pressure steam at 3 bar... 

    Exergoeconomic optimization of a trigeneration system for heating, cooling and power production purpose based on TRR method and using evolutionary algorithm

    , Article Applied Thermal Engineering ; Volume 36, Issue 1 , 2012 , Pages 113-125 ; 13594311 (ISSN) Ghaebi, H ; Saidi, M. H ; Ahmadi, P ; Sharif University of Technology
    2012
    Abstract
    In the present study, exergoeconomic optimization of a trigeneration system for cooling, heating and power purposes has been carried out. The system is made up of air compressor, combustion chamber, gas turbine, dual pressure heat recovery steam generator and absorption chiller in order to produce cooling, heating and power. The design parameters of this study are selected as: air compressor pressure ratio, gas turbine inlet temperature, pinch point temperatures in dual pressure heat recovery steam generator, pressure of steam that enters the generator of absorption chiller, process steam pressure and evaporator of the absorption chiller chilled water outlet temperature. The economic model... 

    Performance analysis and parametric study of thermal energy storage in an aquifer coupled with a heat pump and solar collectors, for a residential complex in Tehran, Iran

    , Article Applied Thermal Engineering ; Volume 62, Issue 1 , 2014 , Pages 156-170 ; ISSN: 13594311 Ghaebi, H ; Bahadori, M. N ; Saidi, M. H ; Sharif University of Technology
    2014
    Abstract
    Aquifers are underground porous formations containing water. Confined aquifers are the formations surrounded by two impermeable layers, called cap rocks and bed rocks. These aquifers are suitable for seasonal thermal energy storage. In the present study, a confined aquifer was considered to meet the cooling and heating energy needs of a residential complex located in Tehran, Iran. Three different alternatives were analyzed in this aquifer thermal energy storage (ATES), including: using ATES for cooling alone, for cooling and heating, as a heat pump, and for heating alone, employing flat plate solar energy collectors. A numerical simulation, based on the finite difference method, was carried... 

    Energy, exergy and thermoeconomic analysis of a combined cooling, heating and power (CCHP) system with gas turbine prime mover

    , Article International Journal of Energy Research ; Volume 35, Issue 8 , June , 2011 , Pages 697-709 ; 0363907X (ISSN) Ghaebi, H ; Amidpour, M ; Karimkashi, S ; Rezayan, O ; Sharif University of Technology
    2011
    Abstract
    In this paper energy, exergy and thermoeconomic analysis of a combined cooling, heating and power (CCHP) system has been performed. Applying the first and second laws of thermodynamics and economic analysis, simultaneously, has made a powerful tool for the analysis of energy systems such as CCHP systems. The system integrates air compressor, combustion chamber, gas turbine, dual pressure heat recovery steam generator (HRSG) and absorption chiller to produce cooling, heating and power. In fact, the first and second laws of thermodynamics are combined with thermoeconomic approaches. Next, computational analysis is performed to investigate the effects of below items on the fuel consumption,... 

    Economic and environmental evaluation of different operation alternatives to aquifer thermal energy storage in Tehran, Iran

    , Article Scientia Iranica ; Volume 24, Issue 2 , 2017 , Pages 610-623 ; 10263098 (ISSN) Ghaebi, H ; Bahadori, M. N ; Saidi, M. H ; Sharif University of Technology
    Sharif University of Technology  2017
    Abstract
    Aquifers are underground porous formations containing water. Confined aquifers are surrounded by impermeable layers on top and bottom, called cap rocks and bed rocks. A confined aquifer with a very low groundwater flow velocity was considered to meet the annual cooling and heating energy requirements of a residential building complex in Tehran, Iran. Three different alternatives of Aquifer Thermal Energy Storage (ATES) were employed to meet the heating/cooling demands of the buildings. These alternatives were using ATES for: Cooling alone, heating alone by coupling with at-plate solar collectors, and cooling and heating by coupling with a heat pump. For the economic evaluation of the... 

    Different operational alternatives of aquifer thermal energy storage system for cooling and heating of a residential complex under various climatic conditions in Iran

    , Article Scientia Iranica ; Volume 26, Issue 3B , 2019 , Pages 1281-1292 ; 10263098 (ISSN) Ghaebi, H ; Bahadori, M. N ; Saidi, M. H ; Sharif University of Technology
    Sharif University of Technology  2019
    Abstract
    In this research, a confined aquifer with low groundwater flow was considered to meet the cooling and heating requirements of residential complexes. The complexes were located in the cities of Ahvaz, Ardabil, Bandar Abbas, Esfahan, Kerman, Rasht, Tehran, and Zahedan. The complex in Ardabil mostly required heating, the ones in Ahvaz and Bandar Abbas mostly required cooling, and the complexes in other cities required both heating and cooling. Four different alternatives of Aquifer Thermal Energy Storage (ATES) were analyzed in this study. These alternatives consisted of using ATES: 1) alone for cooling, 2) coupled with a conventional refrigeration system or a chiller for cooling, 3) by... 

    Exergoeconomic analysis and optimization of innovative cascade bi-evaporator electricity/cooling cycles with two adjustable cooling temperatures

    , Article Applied Thermal Engineering ; Volume 152 , 2019 , Pages 890-906 ; 13594311 (ISSN) Ebadollahi, M ; Rostamzadeh, H ; Ghaebi, H ; Amidpour, M ; Sharif University of Technology
    Elsevier Ltd  2019
    Abstract
    This article works with performance improvement of the conventional combined cooling/power (CCP) cycles to augment energy and exergy efficiencies of the previous systems. For this target, a conceptual configuration of cascade ejector refrigeration system (CERS) is proposed and is joined with organic Rankine cycle (ORC) to generate power and cooling outputs. The introduced CCP system can generate cooling load at two various temperatures for freezing and air-conditioning usages. For power sub-cycle, basic ORC and recuperative ORC with turbine bleeding are selected as topping cycles. Thermodynamic and exergoeconomic assessments of the cycles are done, leading to provision of the working... 

    Different operational alternatives of aquifer thermal energy storage system for cooling and heating of a residential complex under various climatic conditions in Iran

    , Article Scientia Iranica ; Volume 26, Issue 3B , 2019 , Pages 1281-1292 ; 10263098 (ISSN) Ghaebi, H ; Bahadori, M. N ; Saidi, M. H ; Sharif University of Technology
    Sharif University of Technology  2019
    Abstract
    In this research, a confined aquifer with low groundwater flow was considered to meet the cooling and heating requirements of residential complexes. The complexes were located in the cities of Ahvaz, Ardabil, Bandar Abbas, Esfahan, Kerman, Rasht, Tehran, and Zahedan. The complex in Ardabil mostly required heating, the ones in Ahvaz and Bandar Abbas mostly required cooling, and the complexes in other cities required both heating and cooling. Four different alternatives of Aquifer Thermal Energy Storage (ATES) were analyzed in this study. These alternatives consisted of using ATES: 1) alone for cooling, 2) coupled with a conventional refrigeration system or a chiller for cooling, 3) by... 

    Performance assessment and optimization of a humidification dehumidification (HDH) system driven by absorption-compression heat pump cycle

    , Article Desalination ; Volume 447 , 2018 , Pages 84-101 ; 00119164 (ISSN) Rostamzadeh, H ; Shekari Namin, A ; Ghaebi, H ; Amidpour, M ; Sharif University of Technology
    Elsevier B.V  2018
    Abstract
    Feasibility investigation of a humidification dehumidification (HDH) desalination system driven by an absorption-compression heat pump cycle (ACHPC) is carried out in this paper. The proposed hybrid desalination system uses both heating capacity of the discharged brine as a waste heat for the ACHPC and mechanical power of the ACHPC for the HDH system. The system's performance is investigated under different optimal design modes, using genetic algorithm (GA) as the most robust tool for optimization. A steady-state mathematical model based on the mass, energy, exergy, and exergoeconomic balance equations for components of the proposed system is developed and the predicted results are validated... 

    Novel dual-loop bi-evaporator vapor compression refrigeration cycles for freezing and air-conditioning applications

    , Article Applied Thermal Engineering ; Volume 138 , 25 June , 2018 , Pages 563-582 ; 13594311 (ISSN) Rostamzadeh, H ; Rostamzadeh, J ; Matin, P. S ; Ghaebi, H ; Sharif University of Technology
    Elsevier Ltd  2018
    Abstract
    Cooling production at different temperature levels for various applications has been highlighted in recent years since the produced cooling capacity must be used for different applications to meet all subjects’ demands. For this purpose, a novel dual-loop bi-evaporator vapor compression refrigeration cycle is proposed to meet these demands for freezing and air-conditioning applications which can be employed in building sectors. Later, ejector expander is used in place of the expansion valve in the proposed refrigeration system to enhance the performance of this basic system based on the thermodynamics and thermoeconomics viewpoints. Four working fluids of R717, R290, R600a, and R134a are... 

    Advances in heuristic signal processing and applications

    , Book ; Chatterjee, Amitava ; Nobahari, Hadi ; Siarry, Patrick
    Springer  2013
    Abstract
    There have been significant developments in the design and application of algorithms for both one-dimensional signal processing and multidimensional signal processing, namely image and video processing, with the recent focus changing from a step-by-step procedure of designing the algorithm first and following up with in-depth analysis and performance improvement to instead applying heuristic-based methods to solve signal-processing problems. In this book the contributing authors demonstrate both general-purpose algorithms and those aimed at solving specialized application problems, with a special emphasis on heuristic iterative optimization methods employing modern evolutionary and swarm... 

    A novel multigeneration system driven by a hybrid biogas-geothermal heat source, Part I: Thermodynamic modeling

    , Article Energy Conversion and Management ; Volume 177 , 2018 , Pages 535-562 ; 01968904 (ISSN) Rostamzadeh, H ; Ghavami Gargari, S ; Shekari Namin, A ; Ghaebi, H ; Sharif University of Technology
    Elsevier Ltd  2018
    Abstract
    Hybrid renewable energy heat sources provide more sustainable energy resources with high maintenance for high-efficient power plants. Multigeneration systems driven by a hybrid renewable source are proved as cutting-edge technologies in recent studies. In this study, a novel multigeneration system driven by a hybrid biogas-geothermal heat source is proposed and simulated. To demonstrate the feasibility of the proposed multigeneration system, first and second laws analysis are employed as the most effective tools for performance assessment of the systems. It is found that the proposed multigeneration system can produce overall heating capacity, overall cooling capacity, net output power,... 

    Exergoeconomic optimisation of basic and regenerative triple-evaporator combined power and refrigeration cycles

    , Article International Journal of Exergy ; Volume 26, Issue 1-2 , 2018 , Pages 186-225 ; 17428297 (ISSN) Rostamzadeh, H ; Mostoufi, K ; Ebadollahi, M ; Ghaebi, H ; Amidpour, M ; Sharif University of Technology
    Inderscience Enterprises Ltd  2018
    Abstract
    This paper deals with reconstruction of conventional combined cooling and power (CCCP) cycle for producing simultaneous power and cooling outputs for triple applications of freezing, refrigeration and air-conditioning. The proposed systems are integrated from organic Rankine cycles (ORCs) and an ejector refrigeration cycle (ERC). Single- and multi-objective optimisations of the proposed systems are conducted from energy, exergy and exergoeconomic viewpoints, using genetic algorithm (GA). The results of optimisation revealed that the thermal efficiency of the basic triple-evaporator CCP (B-TECCP) and regenerative TECCP (R-TECCP) systems can be improved by 7.48% and 6.23%, respectively,... 

    A novel multigeneration system driven by a hybrid biogas-geothermal heat source, Part II: Multi-criteria optimization

    , Article Energy Conversion and Management ; Volume 180 , 2019 , Pages 859-888 ; 01968904 (ISSN) Rostamzadeh, H ; Gargari, S. G ; Shekari Namin, A ; Ghaebi, H ; Sharif University of Technology
    Elsevier Ltd  2019
    Abstract
    Hybridization of biogas and geothermal energies for power plants can present a promising way to resolve drawbacks of each individual heat source from economic viewpoint, especially when low-temperature geothermal heat source is posited. Concerning this aspect of hybrid renewable heat sources, a novel hybrid biogas-geothermal multigeneration system was proposed in the first part of our study, which was modeled under privilege of thermodynamic laws. In continuation of our previous study, the current study is performed to investigate economic, environmental, and enviroeconomical aspects of the introduced system. Furthermore, single and multi-criteria optimizations of this integrated system are... 

    Proposal and assessment of a new geothermal-based multigeneration system for cooling, heating, power, and hydrogen production, using LNG cold energy recovery

    , Article Renewable Energy ; Volume 135 , 2019 , Pages 66-87 ; 09601481 (ISSN) Ebadollahi, M ; Rostamzadeh, H ; Zamani Pedram, M ; Ghaebi, H ; Amidpour, M ; Sharif University of Technology
    Elsevier Ltd  2019
    Abstract
    Multigeneration systems (MGSs) driven by renewable sources are proved as cutting-edge technologies for multiple productions purposes to curb greenhouse gas emissions. With this regard, a novel geothermal-based MGS is proposed to produce multiple commodities of cooling, heating, power, and hydrogen, simultaneously, using liquefied natural gas (LNG) as cold energy recovery. The system is composed of an organic Rankine cycle (ORC), an ejector refrigeration cycle (ERC), an LNG power generation system, and a proton exchange membrane (PEM) electrolyzer system. To demonstrate the feasibility of the proposed MGS, energy, exergy, and exergoeconomic analysis are employed as the most effective tools... 

    Energy Consumption Mitigation in Buildings by Using Seasonal Energy Storage in Aquifers, Heat Pumps and Solar Energy

    , Ph.D. Dissertation Sharif University of Technology Ghaebi, Hadi (Author) ; Bahadorinejad, Mehdi (Supervisor) ; Saidi, Mohammad Hassan (Supervisor)
    Abstract
    The aim of this research has been to modeling and optimization of steam injected gas turbine with inlet air cooling using absorption chiller. The whole system consists of compressor, combustion chamber, turbine, heat recovery steam generator, absorption chiller and cooling coil. The tasks carried out in this research include four points of view. The thermodynamic, exergetic, thermo-economic and environmental points of view are considered along modeling and optimization process. Design variables including temperature of combustion chamber exhausted gas, pinch point temperature of heat recovery steam generator and steam injection flow rate. Finally this modeling and optimization process is... 

    Development of an Evolutionary Algorithm Based on Surrogate Models to be used in Multi-disciplinary Design Optimization of a Flying Vehicle

    , M.Sc. Thesis Sharif University of Technology Ghoreishi, Mohaddeseh (Author) ; Nobahari, Hadi (Supervisor)
    Abstract
    In this research, multi-disciplinary design optimization (MDO) of a flying vehicle has been done based on the flight simulation. A meta-heuristic algorithm called Multi-objective Adaptive Real-coded Memetic Algorithm (MARCOMA) has been used for optimization. Since solving a MDO problem is a time consuming process, a RBF neural network has been used in the optimization algorithm as a surrogate model. The new algorithm, called MARCOMA+NN, has been tested with some standard benchmarks. MDO problem has six disciplines consists structure, aerodynamic, propulsion, guidance, control, and fire control. The MDO problem has 31 design variables and two objective functions. The objective functions are... 

    Optimal Design and Real-time Implementation of a Cooperative Guidance Algorithm against a Flying Vehicle

    , M.Sc. Thesis Sharif University of Technology Motie, Mahyar (Author) ; Nobahari, Hadi (Supervisor)
    Abstract
    A cooperative aerial system to defense a Ground Station (GS), against an Incoming aerial Targets (IT) is presented. GS is surrounded by given terrains and a group of homogenous Unmanned Aerial Vehicles (UAVs) are employed using a novel online guidance algorithm in a decentralized manner. The proposed algorithm includes loiter, midcourse and terminal phases. During loiter; UAVs follow an optimal circular path. IT is supposed to approach GS along an optimal low altitude trajectory with respect to the terrains. UAVs are informed the initial position and velocity of IT and they are unaware of IT trajectory. Each UAV decides on whether to engage with IT or not, and shares its decision with other... 

    Synthesis and Characterization of PVDF Magnetic Nanocomposite

    , M.Sc. Thesis Sharif University of Technology Hadi, Mina (Author) ; Forounchi, Massoud (Supervisor)
    Abstract
    PVDF (polyvinylidene fluoride) magnetic nanocomposite films were prepared by solution casting using two types of nanomagnetic particles: (i) magnetic nanoparticles synthesized by using an alkaline solution of mixed ferrous/ferric salts along with oleic acid as a coating agent at 70˚C; (ii) Fe3O4 nanoparticles prepared by hydrolysis of aqueous solution of ferrous/ferric salts with potassium hydroxide at room temprature. Scanning electron microscopy (SEM) showed that the PVDF magnetic nanocomposite had a porous structure with Fe3O4 nanoparticles dispersed inside the porous polymer matrix. The presence of crystalline magnetite within the polymer matrix was confirmed by X-Ray diffraction method... 

    Cooperative Search and Localization of Mobile RF Ground Targets, Using a Group of UAVs

    , M.Sc. Thesis Sharif University of Technology Effati, Meysam (Author) ; Nobahari, Hadi (Supervisor)
    Abstract
    In this project, a method for cooperative search and localization of RF ground moving targets by a group of UAVs is developed. It should be noted that UAVs are just equipped with GPS and directional sensors. Since there is fuel constraint for UAVs, they take fuel from a tanker whenever they require. Moreover, searching method enables the UAVs to see different parts of the desired area with almost uniform distribution. In addition, the proposed approach enables the UAVs to perform a local search with the aim of finding the targets having lost their signal during localization mode. Finally, based upon a fueling decision function the UAVs take turn, approach to the fuel tanker, and start...