The Experts below are selected from a list of 6582 Experts worldwide ranked by ideXlab platform

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

  • optimization of a triple cycle based on a solid oxide fuel cell and gas and steam cycles with a multiobjective genetic algorithm and energy exergy and economic analyses
    Energy Conversion and Management, 2019
    Co-Authors: Mehdi Ali Ehyaei, Marc A. Rosen
    Abstract:

    Abstract The current study is directed at the optimization and energy, exergy, and economic analyse of a solid oxide fuel cell, integrated with gas and steam trigeneRation systems. The variables considered are the fuel cell’s temperature and Pressure, air-to-fuel molar Ratio, the Compressor and gas turbine Pressure Ratio, combustion chamber temperature, steam cycle pinch point. The objective functions are the exergy efficiency and the electricity cost. The results show that by selection of the optimal values of the fuel cell’s temperature and Pressure, air-to-fuel molar Ratio, Compressor and gas turbine Pressure Ratio, and the cycle pinch point as 809.8 K, 360 kPa, 2, 2.05, 11.6, and 34.9, the exergy efficiency is increased by 8%, and the produced electricity cost is reduced by 9.7%. The sensitivity analysis shows that an increase in Compressor Pressure Ratio leads to a decrease in the energy and exergy efficiencies and entropy production rates. A change in air-to-fuel molar Ratio from 2 to 3 causes the triple cycle electricity cost first to increase and then to decrease.

  • Exergoeconomic study of gas turbine steam injection and combined power cycles using fog inlet cooling and biomass fuel
    Renewable Energy, 2016
    Co-Authors: Hassan Athari, Marc A. Rosen, Saeed Soltani, Masood Kordoghli Gavifekr, Tatiana Morosuk
    Abstract:

    Biomass energy has the potential to replace fossil fuels despite its lower heat value. Fog cooling and steam injection, as well as adding steam turbine cycles to gas turbine cycles, can enhance the performance of power geneRation systems. Here, the results are reported of energy, exergy and exergoeconomic analyses of two proposed biomass (wood) integrated steam injection cycles and combined power cycles. Their performances are assessed for similar sets of conditions. The thermodynamic analyses demonstrate that at lower values of Compressor Pressure Ratio the combined cycle has a higher thermodynamic efficiency but at higher values of Pressure Ratio the steam injection plant is advantageous. For the same conditions, the steam injection plant exhibits a higher net power output. The exergoeconomic analyses show that electricity and component costs for the combined cycle are higher than for the steam injection plant. Also fog cooling is more influential on the thermodynamic performance of the BIFCC than the BIFSG plant and at Compressor Pressure Ratios of 20 and 26 and higher, respectively, for the BIFCC and BIFSG plants, fog cooling is economic. The exergy loss rate and its cost are higher for the combined cycle at all Pressure Ratios.

  • Gas turbine steam injection and combined power cycles using fog inlet cooling and biomass fuel: A thermodynamic assessment
    Renewable Energy, 2016
    Co-Authors: Hassan Athari, Seyed Mohammad Seyed Mahmoudi, Marc A. Rosen, Saeed Soltani, Tatiana Morosuk
    Abstract:

    The results of energy and exergy analyses of two biomass integrated steam injection cycles and combined power cycles are reported. Fog cooling, steam injection and adding steam turbine cycles to gas turbine cycles can enhance the performance of power geneRation systems. Even with its lower heat value, biomass can be substituted for fossil fuels. The performances of the cycles are assessed under the same conditions. The assessments show that the combined cycle has a higher efficiency at lower values of Compressor Pressure Ratio but the steam injection plant is advantageous at higher Pressure Ratio values. The steam injection plant has a higher net power under the same conditions, while the exergy loss rate is higher for the combined cycle at all Pressure Ratios. But the exergy destruction rate is higher for the steam injection cycle at lower Compressor Pressure Ratios, and for the combined cycle at higher Pressure Ratios.

  • exergoeconomic analysis of a biomass post firing combined cycle power plant
    Energy, 2014
    Co-Authors: Hassan Athari, Seyed Mohammad Seyed Mahmoudi, Marc A. Rosen, Saeed Soltani, Tatiana Morosuk
    Abstract:

    Abstract Biomass can be converted thermo- and bio-chemically to solid, liquid and gaseous biofuels. In this paper, energy, exergy and exergoeconomic analyses are applied to a biomass integrated post-firing combined-cycle power plant. The energy and exergy efficiencies of the cycle are found to be maximized at specific Compressor Pressure Ratio values, and that higher Pressure Ratios reduce the total unit product cost. Increasing the gas turbine inlet temperature and decreasing the Compressor Pressure Ratio decreases the CO 2 mole fraction exiting the power plant. The exergoeconomic factor for the biomass integrated post-firing combined-cycle power plant at the optimum energy/exergy efficiency is 0.39. This implies that the major cost rate of this power plant configuRation is attributable to the exergy destruction cost rate. Increasing the Compressor Pressure Ratio decreases the mass of air per mass of steam in the power plant, implying a reduction in the gas turbine plant size. Increasing both the Compressor Pressure Ratio and the heat recovery steam generator inlet gas temperature increases the capital investment cost compared with the exergy destruction cost. However, increasing the gas turbine inlet temperature decreases this Ratio.

  • a comparative exergoeconomic analysis of waste heat recovery from a gas turbine modular helium reactor via organic rankine cycles
    Sustainability, 2014
    Co-Authors: Naser Shokati, S M S Mahmoudi, Mortaza Yari, Farzad Mohammadkhani, Marc A. Rosen
    Abstract:

    A comparative exergoeconomic analysis is reported for waste heat recovery from a gas turbine-modular helium reactor (GT-MHR) using various configuRations of organic Rankine cycles (ORCs) for generating electricity. The ORC configuRations studied are: a simple organic Rankine cycle (SORC), an ORC with an internal heat exchanger (HORC) and a regenerative organic Rankine cycle (RORC). Exergoeconomic analyses are performed with the specific exergy costing (SPECO) method. First, energy and exergy analyses are applied to the combined cycles. Then, a cost-balance, as well as auxiliary equations are developed for the components to determine the exergoeconomic parameters for the combined cycles and their components. The three combined cycles are compared considering the same operating conditions for the GT-MHR cycle, and a parametric study is done to reveal the effects on the exergoeconomic performance of the combined cycles of various significant parameters, e.g., turbine inlet and evaporator temperatures and Compressor Pressure Ratio. The results show that the GT-MHR/RORC has the lowest unit cost of electricity generated by the ORC turbine. This value is highest for the GT-MHR/HORC. Furthermore, the GT-MHR/RORC has the highest and the GT-MHR/HORC has the lowest exergy destruction cost rate.

Mortaza Yari - One of the best experts on this subject based on the ideXlab platform.

  • exergoeconomic evaluation and optimization of a novel combined augmented kalina cycle gas turbine modular helium reactor
    Applied Thermal Engineering, 2016
    Co-Authors: S M S Mahmoudi, A Pourreza, A D Akbari, Mortaza Yari
    Abstract:

    Abstract A new combined system including Gas Turbine-Modular Helium Reactor (GT-MHR) and an augmented Kalina cycle (AKC) is proposed, analyzed and optimized thermodynamically and economically. The simulation is performed using the conservation of energy, exergy balance and cost equations for each system component. For comparison purposes the previously published data for the combined cycle consisting of the GT-MHR and a conventional Kalina cycle (GT-MHR/KCS34), are also presented. Parametric studies are carried out to show the influences on exergy efficiency and total product unit cost of such decision parameters as Compressor Pressure Ratio, pump Pressure Ratio, ammonia concentRations at different state points and separator temperature. The results indicate that the maximum exergy efficiency of the proposed system is 8.7% and 0.64% higher compared to the corresponding values for the GT-MHR and GT-MHR/KCS34, respectively. The results also show that the minimum total product unit cost for GT-MHR/AKC is 11.3% and 2.53% lower than the corresponding values for the GT-MHR and GT-MHR/KCS34, respectively. It is observed that, under optimized condition, the helium mass flow rate in GT-MHR is reduced as the system is combined with the AKC. This is significant in reducing the size of system and consequently having more economically efficient system.

  • a comparative exergoeconomic analysis of waste heat recovery from a gas turbine modular helium reactor via organic rankine cycles
    Sustainability, 2014
    Co-Authors: Naser Shokati, S M S Mahmoudi, Mortaza Yari, Farzad Mohammadkhani, Marc A. Rosen
    Abstract:

    A comparative exergoeconomic analysis is reported for waste heat recovery from a gas turbine-modular helium reactor (GT-MHR) using various configuRations of organic Rankine cycles (ORCs) for generating electricity. The ORC configuRations studied are: a simple organic Rankine cycle (SORC), an ORC with an internal heat exchanger (HORC) and a regenerative organic Rankine cycle (RORC). Exergoeconomic analyses are performed with the specific exergy costing (SPECO) method. First, energy and exergy analyses are applied to the combined cycles. Then, a cost-balance, as well as auxiliary equations are developed for the components to determine the exergoeconomic parameters for the combined cycles and their components. The three combined cycles are compared considering the same operating conditions for the GT-MHR cycle, and a parametric study is done to reveal the effects on the exergoeconomic performance of the combined cycles of various significant parameters, e.g., turbine inlet and evaporator temperatures and Compressor Pressure Ratio. The results show that the GT-MHR/RORC has the lowest unit cost of electricity generated by the ORC turbine. This value is highest for the GT-MHR/HORC. Furthermore, the GT-MHR/RORC has the highest and the GT-MHR/HORC has the lowest exergy destruction cost rate.

  • exergoeconomic assessment and parametric study of a gas turbine modular helium reactor combined with two organic rankine cycles
    Energy, 2014
    Co-Authors: Farzad Mohammadkhani, S M S Mahmoudi, Mortaza Yari, Naser Shokati, Marc A. Rosen
    Abstract:

    An exergoeconomic analysis is reported for a combined system with a net electrical output of 299 MW in which waste heat from a Gas Turbine-Modular Helium Reactor (GT-MHR) is utilized by two Organic Rankine Cycles (ORCs). A parametric study is also done to reveal the effects on the exergoeconomic performance of the combined system of such significant parameters as Compressor Pressure Ratio, turbine inlet temperature, temperatures of evaporators, pinch point temperature difference in the evaporators and degree of superheat at the ORC (Organic Rankine Cycle) turbines inlet. Finally the combined cycle performance is optimized from the viewpoint of exergoeconomics. The results show that the precooler, the intercooler and the ORC condensers exhibit the worst exergoeconomic performance. For the overall system, the exergoeconomic factor, the capital cost rate and the exergy destruction cost rate are determined to be 37.95%, 6876 $/h and 11,242 $/h, respectively. Also, it is observed that the unit cost of electricity produced by the GT-MHR turbine increases with increasing GT-MHR turbine inlet temperature but decreases as the other above mentioned parameters increase.

  • a comparative exergoeconomic analysis of two biomass and co firing combined power plants
    Energy Conversion and Management, 2013
    Co-Authors: Saeed Soltani, S M S Mahmoudi, Marc A. Rosen, Mortaza Yari, Tatiana Morosuk, V Zare
    Abstract:

    Abstract Biomass energy is a promising potential replacement for fossil fuels in future, because it is relatively abundant, clean and carbon dioxide neutral. Biomass can be converted using thermo-chemical and bio-chemical processes into solid, liquid and gas bio-fuels, which can then be used for generating heat and/or electricity. In the present work, the application of gasification for electricity production is investigated via energy, exergy and exergoeconomic analyses for two configuRations: (1) externally fired biomass combined cycle, and (2) combined cycle with co-firing of biomass and natural gas. The second configuRation is found to be more economic (on a large scale) as its relative cost difference and exergoeconomic factor are less than those for the first configuRation. The results also indicate that the energy and exergy efficiencies of combined cycle with co-firing could be about 2% and 4% higher than those of the externally fired combined cycle, respectively. The energy and exergy efficiencies of both configuRations are maximized at particular values of Compressor Pressure Ratio, but higher Pressure Ratios lead to higher values of the total unit product cost in both configuRations.

  • Thermodynamic analysis of employing ejector and organic Rankine cycles for GT-MHR waste heat utilization: A comparative study
    Energy Conversion and Management, 2013
    Co-Authors: Amir Soroureddin, S M S Mahmoudi, A.s. Mehr, Mortaza Yari
    Abstract:

    Abstract The waste heat from intercooler and pre-cooler of the gas turbine-modular helium reactor (GT-MHR) is utilized to drive organic Rankine and ejector refrigeRation cycles for performance enhancement, in three different configuRations. Meanwhile, a new 2D model is developed for the ejector to predict its performance more accurately. The cycles’ performances are analyzed from the viewpoints of both the first and second laws of thermodynamics. The results of optimization revealed that; one of the configuRations is more efficient than the other ones from the viewpoint of first law of thermodynamics. In this configuRation, at turbine inlet temperature of 850 oC the first law efficiency is 15.86% higher than the GT-MHR cycle and the fuel energy saving Ratio (FESR) could be up to 20.06%. Another configuRation is found to be the most effective (among the three) from the exergy utilization perspective. In this layout, the exergy efficiency is around 2.6% higher than that of the GT-MHR. Through parametric study, the effects of some important parameters such as turbine inlet temperature, pinch point temperature difference as well as the Compressor Pressure Ratio, on the systems’ performances are investigated in detail. The results also showed that the Compressor Pressure Ratio under optimized condition is higher for the configuRation with the highest first law efficiency. This point can be accounted as an economic drawback for the configuRation. Exergy analyses revealed that the Compressor or recuperator (depending on the configuRation) has the second highest exergy destruction after the reactor.

S M S Mahmoudi - One of the best experts on this subject based on the ideXlab platform.

  • exergoeconomic evaluation and optimization of a novel combined augmented kalina cycle gas turbine modular helium reactor
    Applied Thermal Engineering, 2016
    Co-Authors: S M S Mahmoudi, A Pourreza, A D Akbari, Mortaza Yari
    Abstract:

    Abstract A new combined system including Gas Turbine-Modular Helium Reactor (GT-MHR) and an augmented Kalina cycle (AKC) is proposed, analyzed and optimized thermodynamically and economically. The simulation is performed using the conservation of energy, exergy balance and cost equations for each system component. For comparison purposes the previously published data for the combined cycle consisting of the GT-MHR and a conventional Kalina cycle (GT-MHR/KCS34), are also presented. Parametric studies are carried out to show the influences on exergy efficiency and total product unit cost of such decision parameters as Compressor Pressure Ratio, pump Pressure Ratio, ammonia concentRations at different state points and separator temperature. The results indicate that the maximum exergy efficiency of the proposed system is 8.7% and 0.64% higher compared to the corresponding values for the GT-MHR and GT-MHR/KCS34, respectively. The results also show that the minimum total product unit cost for GT-MHR/AKC is 11.3% and 2.53% lower than the corresponding values for the GT-MHR and GT-MHR/KCS34, respectively. It is observed that, under optimized condition, the helium mass flow rate in GT-MHR is reduced as the system is combined with the AKC. This is significant in reducing the size of system and consequently having more economically efficient system.

  • a comparative exergoeconomic analysis of waste heat recovery from a gas turbine modular helium reactor via organic rankine cycles
    Sustainability, 2014
    Co-Authors: Naser Shokati, S M S Mahmoudi, Mortaza Yari, Farzad Mohammadkhani, Marc A. Rosen
    Abstract:

    A comparative exergoeconomic analysis is reported for waste heat recovery from a gas turbine-modular helium reactor (GT-MHR) using various configuRations of organic Rankine cycles (ORCs) for generating electricity. The ORC configuRations studied are: a simple organic Rankine cycle (SORC), an ORC with an internal heat exchanger (HORC) and a regenerative organic Rankine cycle (RORC). Exergoeconomic analyses are performed with the specific exergy costing (SPECO) method. First, energy and exergy analyses are applied to the combined cycles. Then, a cost-balance, as well as auxiliary equations are developed for the components to determine the exergoeconomic parameters for the combined cycles and their components. The three combined cycles are compared considering the same operating conditions for the GT-MHR cycle, and a parametric study is done to reveal the effects on the exergoeconomic performance of the combined cycles of various significant parameters, e.g., turbine inlet and evaporator temperatures and Compressor Pressure Ratio. The results show that the GT-MHR/RORC has the lowest unit cost of electricity generated by the ORC turbine. This value is highest for the GT-MHR/HORC. Furthermore, the GT-MHR/RORC has the highest and the GT-MHR/HORC has the lowest exergy destruction cost rate.

  • exergoeconomic assessment and parametric study of a gas turbine modular helium reactor combined with two organic rankine cycles
    Energy, 2014
    Co-Authors: Farzad Mohammadkhani, S M S Mahmoudi, Mortaza Yari, Naser Shokati, Marc A. Rosen
    Abstract:

    An exergoeconomic analysis is reported for a combined system with a net electrical output of 299 MW in which waste heat from a Gas Turbine-Modular Helium Reactor (GT-MHR) is utilized by two Organic Rankine Cycles (ORCs). A parametric study is also done to reveal the effects on the exergoeconomic performance of the combined system of such significant parameters as Compressor Pressure Ratio, turbine inlet temperature, temperatures of evaporators, pinch point temperature difference in the evaporators and degree of superheat at the ORC (Organic Rankine Cycle) turbines inlet. Finally the combined cycle performance is optimized from the viewpoint of exergoeconomics. The results show that the precooler, the intercooler and the ORC condensers exhibit the worst exergoeconomic performance. For the overall system, the exergoeconomic factor, the capital cost rate and the exergy destruction cost rate are determined to be 37.95%, 6876 $/h and 11,242 $/h, respectively. Also, it is observed that the unit cost of electricity produced by the GT-MHR turbine increases with increasing GT-MHR turbine inlet temperature but decreases as the other above mentioned parameters increase.

  • a comparative exergoeconomic analysis of two biomass and co firing combined power plants
    Energy Conversion and Management, 2013
    Co-Authors: Saeed Soltani, S M S Mahmoudi, Marc A. Rosen, Mortaza Yari, Tatiana Morosuk, V Zare
    Abstract:

    Abstract Biomass energy is a promising potential replacement for fossil fuels in future, because it is relatively abundant, clean and carbon dioxide neutral. Biomass can be converted using thermo-chemical and bio-chemical processes into solid, liquid and gas bio-fuels, which can then be used for generating heat and/or electricity. In the present work, the application of gasification for electricity production is investigated via energy, exergy and exergoeconomic analyses for two configuRations: (1) externally fired biomass combined cycle, and (2) combined cycle with co-firing of biomass and natural gas. The second configuRation is found to be more economic (on a large scale) as its relative cost difference and exergoeconomic factor are less than those for the first configuRation. The results also indicate that the energy and exergy efficiencies of combined cycle with co-firing could be about 2% and 4% higher than those of the externally fired combined cycle, respectively. The energy and exergy efficiencies of both configuRations are maximized at particular values of Compressor Pressure Ratio, but higher Pressure Ratios lead to higher values of the total unit product cost in both configuRations.

  • Thermodynamic analysis of employing ejector and organic Rankine cycles for GT-MHR waste heat utilization: A comparative study
    Energy Conversion and Management, 2013
    Co-Authors: Amir Soroureddin, S M S Mahmoudi, A.s. Mehr, Mortaza Yari
    Abstract:

    Abstract The waste heat from intercooler and pre-cooler of the gas turbine-modular helium reactor (GT-MHR) is utilized to drive organic Rankine and ejector refrigeRation cycles for performance enhancement, in three different configuRations. Meanwhile, a new 2D model is developed for the ejector to predict its performance more accurately. The cycles’ performances are analyzed from the viewpoints of both the first and second laws of thermodynamics. The results of optimization revealed that; one of the configuRations is more efficient than the other ones from the viewpoint of first law of thermodynamics. In this configuRation, at turbine inlet temperature of 850 oC the first law efficiency is 15.86% higher than the GT-MHR cycle and the fuel energy saving Ratio (FESR) could be up to 20.06%. Another configuRation is found to be the most effective (among the three) from the exergy utilization perspective. In this layout, the exergy efficiency is around 2.6% higher than that of the GT-MHR. Through parametric study, the effects of some important parameters such as turbine inlet temperature, pinch point temperature difference as well as the Compressor Pressure Ratio, on the systems’ performances are investigated in detail. The results also showed that the Compressor Pressure Ratio under optimized condition is higher for the configuRation with the highest first law efficiency. This point can be accounted as an economic drawback for the configuRation. Exergy analyses revealed that the Compressor or recuperator (depending on the configuRation) has the second highest exergy destruction after the reactor.

W. Zhang - One of the best experts on this subject based on the ideXlab platform.

  • turbine. Part 2: Performance optimization
    2016
    Co-Authors: Linge Che, W. Zhang
    Abstract:

    The power and efficiency of the open regenerative cycle of an externally fired micro gas turbine power plant without blade cooling with Pressure drop irreversibilities are optimized based on the model established using thermodynamic optimization theory in Part 1 of this article by adjusting the mass flow rate (or the distribution of Pressure losses along the flow path). It is shown that there are optimal air mass flow rates (or the distribution of Pressure losses along the flow path) which maximize the net power output, and the maximum has an additional maximum with respect to the Compressor Pressure Ratio. When the optimization is performed with the constraints of the fixed fuel flow and the plant size, the net power output and the thermal conversion efficiency of the cycle can be maximized again by properly allocating the fixed flow area among the Compressor inlet and the power turbine outlet. The numerical examples show the effects of the design parameters on the power output and heat conversion efficienc

  • turbine. Part 2: Performance optimization
    2016
    Co-Authors: Linge Che, W. Zhang
    Abstract:

    The power and efficiency of the open regenerative cycle of an externally fired micro gas turbine power plant without blade cooling with Pressure drop irreversibilities are optimized based on the model established using thermodynamic optimization theory in Part 1 of this article by adjusting the mass flow rate (or the distribution of Pressure losses along the flow path). It is shown that there are optimal air mass flow rates (or the distribution of Pressure losses along the flow path) which maximize the net power output, and the maximum has an additional maximum with respect to the Compressor Pressure Ratio. When the optimization is performed with the constraints of the fixed fuel flow and the plant size, the net power output and the thermal conversion efficiency of the cycle can be maximized again by properly allocating the fixed flow area among the Compressor inlet and the power turbine outlet. The numerical examples show the effects of the design parameters on the power output and heat conversio

  • thermodynamic optimisation for open regenerated inverse brayton cycle refrigeRation heat pump cycle part 2 performance optimisation
    Journal of The Energy Institute, 2016
    Co-Authors: W. Zhang
    Abstract:

    The thermodynamic performances for the model established in Part 1 of this paper are optimised by adjusting the mass flowrate. When the optimisation is performed with the constraints of the fixed power input and the plant size, the coefficient of performance can be maximised again by properly allocating the fixed flow area among the Compressor inlet and the expander outlet. The coefficient of performance of refrigeRation can be maximised again by properly allocating the fixed heat conductance inventory among the hot and cold side exchangers and the regenerator. The obtained maxima reach its maxima at optimal Compressor Pressure Ratio. When the heat conductance distribution of the regenerator is fixed for the heat pump, the coefficient of performance can be maximised again by properly allocating the fixed heat conductance inventory between the hot and cold side exchangers. The obtained maxima reach its maxima at optimal Compressor Pressure Ratio.

  • Power and efficiency optimization for combined Brayton and two parallel inverse Brayton cycles. Part 2: performance optimization
    2007
    Co-Authors: W. Zhang, F Sun
    Abstract:

    Abstract: The power and efficiency of the open combined Brayton and two parallel inverse Brayton cycles are analysed and optimized based on the model established using finite-time thermodynamics in Part 1 of the current paper by adjusting the Compressor inlet Pressure of the two parallel inverse Brayton cycles, the mass flowrate and the distribution of Pressure losses along the flow path. It is shown that the power output has a maximum with respect to the Compressor inlet Pressures of the two parallel inverse Brayton cycles, the air mass flowrate or any of the overall Pressure drops, and the maximized power output has an additional maxi-mum with respect to the Compressor Pressure Ratio of the top cycle. The power output and the thermal conversion efficiency have the maximum values when the mass flowrates of the first and the second inverse Brayton cycles are the same. When the optimization is performed with the constraints of a fixed fuel flowrate and the power plant size, the power output and ther-mal conversion efficiency can be maximized again by properly allocating the fixed overall flow area among the Compressor inlet of the top cycle and the turbine outlets of the two parallel inverse Brayton cycles. The numerical examples show the effects of design parameters on the power output and heat conversion efficiency

Tatiana Morosuk - One of the best experts on this subject based on the ideXlab platform.

  • Exergoeconomic study of gas turbine steam injection and combined power cycles using fog inlet cooling and biomass fuel
    Renewable Energy, 2016
    Co-Authors: Hassan Athari, Marc A. Rosen, Saeed Soltani, Masood Kordoghli Gavifekr, Tatiana Morosuk
    Abstract:

    Biomass energy has the potential to replace fossil fuels despite its lower heat value. Fog cooling and steam injection, as well as adding steam turbine cycles to gas turbine cycles, can enhance the performance of power geneRation systems. Here, the results are reported of energy, exergy and exergoeconomic analyses of two proposed biomass (wood) integrated steam injection cycles and combined power cycles. Their performances are assessed for similar sets of conditions. The thermodynamic analyses demonstrate that at lower values of Compressor Pressure Ratio the combined cycle has a higher thermodynamic efficiency but at higher values of Pressure Ratio the steam injection plant is advantageous. For the same conditions, the steam injection plant exhibits a higher net power output. The exergoeconomic analyses show that electricity and component costs for the combined cycle are higher than for the steam injection plant. Also fog cooling is more influential on the thermodynamic performance of the BIFCC than the BIFSG plant and at Compressor Pressure Ratios of 20 and 26 and higher, respectively, for the BIFCC and BIFSG plants, fog cooling is economic. The exergy loss rate and its cost are higher for the combined cycle at all Pressure Ratios.

  • Gas turbine steam injection and combined power cycles using fog inlet cooling and biomass fuel: A thermodynamic assessment
    Renewable Energy, 2016
    Co-Authors: Hassan Athari, Seyed Mohammad Seyed Mahmoudi, Marc A. Rosen, Saeed Soltani, Tatiana Morosuk
    Abstract:

    The results of energy and exergy analyses of two biomass integrated steam injection cycles and combined power cycles are reported. Fog cooling, steam injection and adding steam turbine cycles to gas turbine cycles can enhance the performance of power geneRation systems. Even with its lower heat value, biomass can be substituted for fossil fuels. The performances of the cycles are assessed under the same conditions. The assessments show that the combined cycle has a higher efficiency at lower values of Compressor Pressure Ratio but the steam injection plant is advantageous at higher Pressure Ratio values. The steam injection plant has a higher net power under the same conditions, while the exergy loss rate is higher for the combined cycle at all Pressure Ratios. But the exergy destruction rate is higher for the steam injection cycle at lower Compressor Pressure Ratios, and for the combined cycle at higher Pressure Ratios.

  • exergoeconomic analysis of a biomass post firing combined cycle power plant
    Energy, 2014
    Co-Authors: Hassan Athari, Seyed Mohammad Seyed Mahmoudi, Marc A. Rosen, Saeed Soltani, Tatiana Morosuk
    Abstract:

    Abstract Biomass can be converted thermo- and bio-chemically to solid, liquid and gaseous biofuels. In this paper, energy, exergy and exergoeconomic analyses are applied to a biomass integrated post-firing combined-cycle power plant. The energy and exergy efficiencies of the cycle are found to be maximized at specific Compressor Pressure Ratio values, and that higher Pressure Ratios reduce the total unit product cost. Increasing the gas turbine inlet temperature and decreasing the Compressor Pressure Ratio decreases the CO 2 mole fraction exiting the power plant. The exergoeconomic factor for the biomass integrated post-firing combined-cycle power plant at the optimum energy/exergy efficiency is 0.39. This implies that the major cost rate of this power plant configuRation is attributable to the exergy destruction cost rate. Increasing the Compressor Pressure Ratio decreases the mass of air per mass of steam in the power plant, implying a reduction in the gas turbine plant size. Increasing both the Compressor Pressure Ratio and the heat recovery steam generator inlet gas temperature increases the capital investment cost compared with the exergy destruction cost. However, increasing the gas turbine inlet temperature decreases this Ratio.

  • a comparative exergoeconomic analysis of two biomass and co firing combined power plants
    Energy Conversion and Management, 2013
    Co-Authors: Saeed Soltani, S M S Mahmoudi, Marc A. Rosen, Mortaza Yari, Tatiana Morosuk, V Zare
    Abstract:

    Abstract Biomass energy is a promising potential replacement for fossil fuels in future, because it is relatively abundant, clean and carbon dioxide neutral. Biomass can be converted using thermo-chemical and bio-chemical processes into solid, liquid and gas bio-fuels, which can then be used for generating heat and/or electricity. In the present work, the application of gasification for electricity production is investigated via energy, exergy and exergoeconomic analyses for two configuRations: (1) externally fired biomass combined cycle, and (2) combined cycle with co-firing of biomass and natural gas. The second configuRation is found to be more economic (on a large scale) as its relative cost difference and exergoeconomic factor are less than those for the first configuRation. The results also indicate that the energy and exergy efficiencies of combined cycle with co-firing could be about 2% and 4% higher than those of the externally fired combined cycle, respectively. The energy and exergy efficiencies of both configuRations are maximized at particular values of Compressor Pressure Ratio, but higher Pressure Ratios lead to higher values of the total unit product cost in both configuRations.