The Experts below are selected from a list of 1587 Experts worldwide ranked by ideXlab platform

Marc A. Rosen - One of the best experts on this subject based on the ideXlab platform.

  • thermoeconomic multi objective optimization of a novel biomass based integrated energy system
    Energy, 2014
    Co-Authors: Pouria Ahmadi, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    Both thermoeconomic modeling and multi-objective optimization studies are undertaken for a novel integrated multigeneration system, containing a biomass combustor, an organic Rankine cycle to produce electricity, a double-effect absorption chiller for cooling, a heat exchanger, a proton exchange membrane electrolyzer to produce hydrogen, a Domestic Water Heater to produce hot Water and a reverse osmosis desalination unit to produce fresh Water. Energy and exergy analyses and an environmental impact assessment are included. A multi-objective optimization method based on a fast and elitist NSGA-II (non-dominated sorting genetic algorithm) is developed and employed to determine the best design parameters for the system. The two objective functions utilized in the optimization study are the total cost rate of the system, which is the cost associated with fuel, component purchasing and environmental impact, and the system exergy efficiency. The total cost rate of the system is minimized while the cycle exergy efficiency is maximized using an evolutionary algorithm. To provide insight, the Pareto frontier is shown for a multi-objective optimization. In addition, a closed form equation for the relationship between exergy efficiency and total cost rate is derived. A sensitivity analysis is performed to assess the effects of several design parameters on the system total exergy destruction rate, CO2 emission and exergy efficiency.

  • Development and assessment of an integrated biomass-based multi-generation energy system
    Energy, 2013
    Co-Authors: Ibrahim Dincer, Marc A. Rosen
    Abstract:

    A new multi-generation system based on a biomass combustor, an organic Rankine cycle (ORC), an absorption chiller and a proton exchange membrane electrolyzer to produce hydrogen, and a Domestic Water Heater for hot Water production, is proposed and thermodynamically assessed. Exergy analysis is conducted to determine the irreversibilities in each component and the system performance. In addition, an environmental impact assessment of the multi-generation system is performed, and the potential reduction in CO2 emissions when the system shifts from power generation to multi-generation are investigated. To understand system performance more comprehensively, a parametric study is performed to investigate the effects of several important design parameters on the energy and exergy efficiencies of the system. © 2013.

  • environmental impact assessments of integrated multigeneration energy systems
    2013
    Co-Authors: Pouria Ahmadi, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    Multigeneration refers to an energy process which produces several useful outputs from one or more kinds of primary energy inputs. The main aims, when using multigeneration, are to increase efficiency and sustainability while reducing environmental impact and cost. In this chapter, thermodynamic modeling is performed of a multigeneration system consisting of a micro gas turbine, a double-pressure heat recovery steam generator, an absorption chiller, a Domestic Water Heater that produces hot Water at 60 °C, and a proton exchange membrane electrolyzer. In order to determine the irreversibilities in each component and the system performance, an exergy analysis is conducted. In addition, an environmental impact assessment of the multigeneration system is performed, and the potential reductions in CO2 and CO emissions when the system shifts from power generation to multigeneration are investigated. To understand system performance more comprehensively, a parametric study is performed to study the effects of several important design parameters on the system energy and exergy efficiencies.

  • exergo environmental analysis of an integrated organic rankine cycle for trigeneration
    Energy Conversion and Management, 2012
    Co-Authors: Pouria Ahmadi, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    A comprehensive thermodynamic modelling is reported of a trigeneration system for cooling, heating (and/or hot Water) and electricity generation. This trigeneration system consists of a gas turbine cycle, an organic Rankine cycle (ORC), a single-effect absorption chiller and a Domestic Water Heater. Energy and exergy analyses, environmental impact assessments and related parametric studies are carried out, and parameters that measure environmental impact and sustainability are evaluated. The exergy efficiency of the trigeneration system is found to be higher than that of typical combined heat and power systems or gas turbine cycles. The results also indicate that carbon dioxide emissions for the trigeneration system are less than for the aforementioned systems. The exergy results show that combustion chamber has the largest exergy destruction of the cycle components, due to the irreversible nature of its chemical reactions and the high temperature difference between the working fluid and flame temperature. The parametric investigations show that the compressor pressure ratio, the gas turbine inlet temperature and the gas turbine isentropic efficiency significantly affect the exergy efficiency and environmental impact of the trigeneration system. Also, increasing the turbine inlet temperature decreases the cost of environmental impact, primarily by reducing the combustion chamber mass flow rate.

Pouria Ahmadi - One of the best experts on this subject based on the ideXlab platform.

  • 4e analysis and multi objective optimization of a cchp cycle based on gas turbine and ejector refrigeration
    Applied Thermal Engineering, 2018
    Co-Authors: Mahdi Moghimi, Pouria Ahmadi, Mohammad Ali Emadi, Hesam Moghadasi
    Abstract:

    Abstract In this research paper, the performance of a new configuration of a Combined Cooling, Heating and Power (CCHP) cycle including a Brayton cycle, a Rankine cycle, an ejector refrigeration cycle, and a Domestic Water Heater is studied by utilization of 4E (energy, exergy, economic and environmental) analysis. Firstly, performance evaluation of the cycle is carried out using exergy and energy as a potential tool. In addition, an environmental assessment is applied to address the environmental impacts of the new multi-generation cycle and compare with the simple Brayton cycle. Results demonstrate that the CCHP cycle has greater exergy and energy efficiencies compared to a simple Brayton cycle. Moreover, the effects of several major design variables on the performance of the cycle are studied and the findings are presented. The major design parameters are gas turbine inlet temperature, compressor pressure ratio, heat recovery steam generator (HRSG) pressures, HRSG pinch point temperatures and regenerator effectiveness. In order to optimize the cycle and find the optimal selection of these design variable, two objective functions namely levelized total annual cost and exergy efficiency are defined and a multi-objective optimization is implemented. Based on the optimization outcomes, optimal points are found and the respective Pareto front is plotted. Comparing CCHP cycle to corresponding Brayton cycle, it is revealed that the CCHP cycle has higher exergy efficiency (7%) and energy efficiency (12%) rather than Brayton cycle.

  • thermoeconomic multi objective optimization of a novel biomass based integrated energy system
    Energy, 2014
    Co-Authors: Pouria Ahmadi, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    Both thermoeconomic modeling and multi-objective optimization studies are undertaken for a novel integrated multigeneration system, containing a biomass combustor, an organic Rankine cycle to produce electricity, a double-effect absorption chiller for cooling, a heat exchanger, a proton exchange membrane electrolyzer to produce hydrogen, a Domestic Water Heater to produce hot Water and a reverse osmosis desalination unit to produce fresh Water. Energy and exergy analyses and an environmental impact assessment are included. A multi-objective optimization method based on a fast and elitist NSGA-II (non-dominated sorting genetic algorithm) is developed and employed to determine the best design parameters for the system. The two objective functions utilized in the optimization study are the total cost rate of the system, which is the cost associated with fuel, component purchasing and environmental impact, and the system exergy efficiency. The total cost rate of the system is minimized while the cycle exergy efficiency is maximized using an evolutionary algorithm. To provide insight, the Pareto frontier is shown for a multi-objective optimization. In addition, a closed form equation for the relationship between exergy efficiency and total cost rate is derived. A sensitivity analysis is performed to assess the effects of several design parameters on the system total exergy destruction rate, CO2 emission and exergy efficiency.

  • environmental impact assessments of integrated multigeneration energy systems
    2013
    Co-Authors: Pouria Ahmadi, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    Multigeneration refers to an energy process which produces several useful outputs from one or more kinds of primary energy inputs. The main aims, when using multigeneration, are to increase efficiency and sustainability while reducing environmental impact and cost. In this chapter, thermodynamic modeling is performed of a multigeneration system consisting of a micro gas turbine, a double-pressure heat recovery steam generator, an absorption chiller, a Domestic Water Heater that produces hot Water at 60 °C, and a proton exchange membrane electrolyzer. In order to determine the irreversibilities in each component and the system performance, an exergy analysis is conducted. In addition, an environmental impact assessment of the multigeneration system is performed, and the potential reductions in CO2 and CO emissions when the system shifts from power generation to multigeneration are investigated. To understand system performance more comprehensively, a parametric study is performed to study the effects of several important design parameters on the system energy and exergy efficiencies.

  • exergo environmental analysis of an integrated organic rankine cycle for trigeneration
    Energy Conversion and Management, 2012
    Co-Authors: Pouria Ahmadi, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    A comprehensive thermodynamic modelling is reported of a trigeneration system for cooling, heating (and/or hot Water) and electricity generation. This trigeneration system consists of a gas turbine cycle, an organic Rankine cycle (ORC), a single-effect absorption chiller and a Domestic Water Heater. Energy and exergy analyses, environmental impact assessments and related parametric studies are carried out, and parameters that measure environmental impact and sustainability are evaluated. The exergy efficiency of the trigeneration system is found to be higher than that of typical combined heat and power systems or gas turbine cycles. The results also indicate that carbon dioxide emissions for the trigeneration system are less than for the aforementioned systems. The exergy results show that combustion chamber has the largest exergy destruction of the cycle components, due to the irreversible nature of its chemical reactions and the high temperature difference between the working fluid and flame temperature. The parametric investigations show that the compressor pressure ratio, the gas turbine inlet temperature and the gas turbine isentropic efficiency significantly affect the exergy efficiency and environmental impact of the trigeneration system. Also, increasing the turbine inlet temperature decreases the cost of environmental impact, primarily by reducing the combustion chamber mass flow rate.

Ibrahim Dincer - One of the best experts on this subject based on the ideXlab platform.

  • thermoeconomic multi objective optimization of a novel biomass based integrated energy system
    Energy, 2014
    Co-Authors: Pouria Ahmadi, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    Both thermoeconomic modeling and multi-objective optimization studies are undertaken for a novel integrated multigeneration system, containing a biomass combustor, an organic Rankine cycle to produce electricity, a double-effect absorption chiller for cooling, a heat exchanger, a proton exchange membrane electrolyzer to produce hydrogen, a Domestic Water Heater to produce hot Water and a reverse osmosis desalination unit to produce fresh Water. Energy and exergy analyses and an environmental impact assessment are included. A multi-objective optimization method based on a fast and elitist NSGA-II (non-dominated sorting genetic algorithm) is developed and employed to determine the best design parameters for the system. The two objective functions utilized in the optimization study are the total cost rate of the system, which is the cost associated with fuel, component purchasing and environmental impact, and the system exergy efficiency. The total cost rate of the system is minimized while the cycle exergy efficiency is maximized using an evolutionary algorithm. To provide insight, the Pareto frontier is shown for a multi-objective optimization. In addition, a closed form equation for the relationship between exergy efficiency and total cost rate is derived. A sensitivity analysis is performed to assess the effects of several design parameters on the system total exergy destruction rate, CO2 emission and exergy efficiency.

  • Development and assessment of an integrated biomass-based multi-generation energy system
    Energy, 2013
    Co-Authors: Ibrahim Dincer, Marc A. Rosen
    Abstract:

    A new multi-generation system based on a biomass combustor, an organic Rankine cycle (ORC), an absorption chiller and a proton exchange membrane electrolyzer to produce hydrogen, and a Domestic Water Heater for hot Water production, is proposed and thermodynamically assessed. Exergy analysis is conducted to determine the irreversibilities in each component and the system performance. In addition, an environmental impact assessment of the multi-generation system is performed, and the potential reduction in CO2 emissions when the system shifts from power generation to multi-generation are investigated. To understand system performance more comprehensively, a parametric study is performed to investigate the effects of several important design parameters on the energy and exergy efficiencies of the system. © 2013.

  • environmental impact assessments of integrated multigeneration energy systems
    2013
    Co-Authors: Pouria Ahmadi, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    Multigeneration refers to an energy process which produces several useful outputs from one or more kinds of primary energy inputs. The main aims, when using multigeneration, are to increase efficiency and sustainability while reducing environmental impact and cost. In this chapter, thermodynamic modeling is performed of a multigeneration system consisting of a micro gas turbine, a double-pressure heat recovery steam generator, an absorption chiller, a Domestic Water Heater that produces hot Water at 60 °C, and a proton exchange membrane electrolyzer. In order to determine the irreversibilities in each component and the system performance, an exergy analysis is conducted. In addition, an environmental impact assessment of the multigeneration system is performed, and the potential reductions in CO2 and CO emissions when the system shifts from power generation to multigeneration are investigated. To understand system performance more comprehensively, a parametric study is performed to study the effects of several important design parameters on the system energy and exergy efficiencies.

  • exergo environmental analysis of an integrated organic rankine cycle for trigeneration
    Energy Conversion and Management, 2012
    Co-Authors: Pouria Ahmadi, Ibrahim Dincer, Marc A. Rosen
    Abstract:

    A comprehensive thermodynamic modelling is reported of a trigeneration system for cooling, heating (and/or hot Water) and electricity generation. This trigeneration system consists of a gas turbine cycle, an organic Rankine cycle (ORC), a single-effect absorption chiller and a Domestic Water Heater. Energy and exergy analyses, environmental impact assessments and related parametric studies are carried out, and parameters that measure environmental impact and sustainability are evaluated. The exergy efficiency of the trigeneration system is found to be higher than that of typical combined heat and power systems or gas turbine cycles. The results also indicate that carbon dioxide emissions for the trigeneration system are less than for the aforementioned systems. The exergy results show that combustion chamber has the largest exergy destruction of the cycle components, due to the irreversible nature of its chemical reactions and the high temperature difference between the working fluid and flame temperature. The parametric investigations show that the compressor pressure ratio, the gas turbine inlet temperature and the gas turbine isentropic efficiency significantly affect the exergy efficiency and environmental impact of the trigeneration system. Also, increasing the turbine inlet temperature decreases the cost of environmental impact, primarily by reducing the combustion chamber mass flow rate.

Iparraguirre, Lorenzo Marcos - One of the best experts on this subject based on the ideXlab platform.

  • Física de las artefactos domésticos: el calefón
    Asociación de Profesores de Física de la Argentina, 2016
    Co-Authors: Iparraguirre, Lorenzo Marcos
    Abstract:

    A typical "pencil and paper" problem, suitable for the teaching of Physics at secondary leve! is stated. The problem refers to the calculations of power, energy, volume flow, etc., in the functioning of a Domestic Water Heater. The problem is solved, and from the discussion of the outcomes, arguments arise supporting the idea that this kind of problem must be stated si de by si de whith the correspondingexperimental activity. The suitable experimental activity is stated, its development is analized, and sorne technical details are developed. This information is useful for a teacher who wants to transfer the activity to the reality of his classroom.Se plantea un típico problema de lápiz y papel, adecuado para la enseñanza de la Física en el nivel medio, referido al cálculo de potencias, energías, caudales, etc. en el funcionamiento de un calefón doméstico común. Se resuelve el problema, y a partir de la discusión de los resultados, se obtienen argumentos para apoyar la idea de que este tipo de problemas debe ser planteado acompañado de las correspondientes actividades experimentales. Se plantea una actividad experimental acorde con esta idea, se analiza su desarrollo, y se desarrollan también algunos detalles técnicos útiles para un docente que quiera transferirla a la realidad de su propia aula

Ehsan Akrami - One of the best experts on this subject based on the ideXlab platform.

  • comprehensive analysis of a multi generation energy system by using an energy exergy methodology for hot Water cooling power and hydrogen production
    Applied Thermal Engineering, 2018
    Co-Authors: Ehsan Akrami, Iman Khazaee, Aslan Gholami
    Abstract:

    Abstract In this study, an energy-exergy methodology was applied to achieve more precise conditions for hot Water, cooling, power and hydrogen production via a proposed multi-generation system comprised of a geothermal based organic Rankine cycle, Domestic Water Heater, absorption refrigeration cycle and proton exchange membrane electrolyzer. Furthermore, for evaluation of the proposed system performance, the effects of such key variables as brine temperature, turbine inlet temperature, generator temperature, brine mass flow rate and electrolyzer current density on the related efficiencies of energy and exergy for the whole system were investigated. For specified conditions, the results show that energy and exergy efficiencies of the entire system are calculated around 33.92% and 43.59%, respectively. Moreover, estimation of the exergy destruction rate in each system component indicated that the highest rate of exergy destruction occurred in the heat recovery steam generator (HRSG) with 16.65% of the total amount of exergy input to the system. And finally, net electrical power output, mass flow rate of hot Water, cooling capacity and mass flow rate of hydrogen production are as follows: 816.7 kW, 7.06 kg/s, 1896 kW and 0.05g/s.

  • energetic and exergoeconomic assessment of a multi generation energy system based on indirect use of geothermal energy
    Energy, 2017
    Co-Authors: Ehsan Akrami, Ata Chitsaz, Hossein Nami, S M S Mahmoudi
    Abstract:

    In this paper, a geothermal based multi-generation energy system, including organic Rankine cycle, Domestic Water Heater, absorption refrigeration cycle and proton exchange membrane electrolyzer, is developed to generate electricity, heating, cooling and hydrogen. For this purpose, energetic, exergetic and exergoeconomic analysis are undertaken upon proposed system. Also, the effects of some important variables, i.e. geothermal Water temperature, turbine inlet temperature and pressure, generator temperature, geothermal Water mass flow rate and electrolyzer current density on the several parameters such as energy and exergy efficiencies of the proposed system, heating and cooling load, net electrical output power, hydrogen production, unit cost of each system products and total unit cost of the products are investigated. For specified conditions, the results show that energy and exergy efficiencies of the proposed multi-generation system are calculated about 34.98% and 49.17%, respectively. The highest and lowest total unit cost of the products estimated approximately 23.18 and 22.73 $/GJ, respectively, by considering that geothermal Water temperature increases from 185 °C to 215 °C.