The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform
Khasani Jaelani - One of the best experts on this subject based on the ideXlab platform.
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Exergy analysis and optimization of Dieng single-Flash geothermal power plant
Energy Conversion and Management, 2014Co-Authors: Nugroho Agung Pambudi, Ryuichi Itoi, Saeid Jalilinasrabady, Khasani JaelaniAbstract:Abstract Exergy analysis and optimization of a single-flash geothermal power plant are conducted by developing a mathematical model that is applied to the Dieng geothermal power plant in Indonesia. Calculations are conducted by using the Engineering Equation Solver (EES) code using methods based on the laws of thermodynamics. The exergy flow and efficiency are computed at several plant components, including the Separator, turbine, condenser, and for the whole power plant. The exergy of the geothermal fluid that is discharged from the production wells is estimated to be 59.52 MW. This amount of fluid produces 21.71 MW of electricity from the power plant overall, with second law efficiency to be 36.48%. There is a considerable amount of waste brine, amounting to 17.98% (10.70 MW) of the total available exergy, which is disposed of in the plant’s reservoir. The optimization of the plant is carried out by adjusting the Separator Pressure. The results show that a slight increase of 20 kW in the output power can be attained by lowering the Separator Pressure to 9 bar from 10 bar. The Grassmann diagram shows the exergy losses at each component in the power plant. The turbine and Separator losses are 7.51 MW (12.62%) and 8.04 MW (13.5%), respectively, while the cooling tower has an exergy loss of 2.62 MW (4.40%). The total condenser loss is 5.8 MW (9.75%).
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Exergy analysis and optimization of Dieng single-Flash geothermal power plant
Energy Conversion and Management, 2014Co-Authors: Nugroho Agung Pambudi, Ryuichi Itoi, Saeid Jalilinasrabady, Khasani JaelaniAbstract:Exergy analysis and optimization of a single-flash geothermal power plant are conducted by developing a mathematical model that is applied to the Dieng geothermal power plant in Indonesia. Calculations are conducted by using the Engineering Equation Solver (EES) code using methods based on the laws of thermodynamics. The exergy flow and efficiency are computed at several plant components, including the Separator, turbine, condenser, and for the whole power plant. The exergy of the geothermal fluid that is discharged from the production wells is estimated to be 59.52 MW. This amount of fluid produces 21.71 MW of electricity from the power plant overall, with second law efficiency to be 36.48%. There is a considerable amount of waste brine, amounting to 17.98% (10.70 MW) of the total available exergy, which is disposed of in the plant's reservoir. The optimization of the plant is carried out by adjusting the Separator Pressure. The results show that a slight increase of 20 kW in the output power can be attained by lowering the Separator Pressure to 9 bar from 10 bar. The Grassmann diagram shows the exergy losses at each component in the power plant. The turbine and Separator losses are 7.51 MW (12.62%) and 8.04 MW (13.5%), respectively, while the cooling tower has an exergy loss of 2.62 MW (4.40%). The total condenser loss is 5.8 MW (9.75%). © 2013 Elsevier Ltd. All rights reserved.
Gulden Gokcen - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic assessment of gas removal systems for single-flash geothermal power plants
Applied Thermal Engineering, 2009Co-Authors: N. Yildirim Ozcan, Gulden GokcenAbstract:Abstract Geothermal fluids contain non-condensable gases (NCGs) at various amounts. NCGs flow to a conventional geothermal power plant (GPP) with steam phase and should be withdrawn from the condenser by a gas removal system to prevent increase in condenser Pressure and consequently decrease in power generation. Therefore, to remove NCGs from the system is critical especially at high NCG fractions. In this study, the net power output and specific steam consumption of a single-flash GPP is evaluated depending on the Separator Pressure, NCG fraction and wet bulb temperature of the environment, and three different conventional gas removal options which are two-stage steam jet ejector system, two-stage hybrid system and two-stage compressor system. A simulation code is written in EES to model the plant for each option. The model uses the data of Kizildere Geothermal Power Plant (KGPP) – Turkey, which is a single-flash plant with extremely high NCG fraction, to allow a comparison between the results of the modelling and the operational data of an actual single-flash GPP. Under given conditions, thermodynamic analysis resulted that NCG fraction is the most significant factor on GPP performance and the compressor system is the most efficient and robust option where the influence of the NCG fraction is limited.
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Thermodynamic assessment of gas removal systems for single-flash geothermal power plants
Applied Thermal Engineering, 2009Co-Authors: N. Yildirim Ozcan, Gulden GokcenAbstract:Geothermal fluids contain non-condensable gases (NCGs) at various amounts. NCGs flow to a conventional geothermal power plant (GPP) with steam phase and should be withdrawn from the condenser by a gas removal system to prevent increase in condenser Pressure and consequently decrease in power generation. Therefore, to remove NCGs from the system is critical especially at high NCG fractions. In this study, the net power output and specific steam consumption of a single-flash GPP is evaluated depending on the Separator Pressure, NCG fraction and wet bulb temperature of the environment, and three different conventional gas removal options which are two-stage steam jet ejector system, two-stage hybrid system and two-stage compressor system. A simulation code is written in EES to model the plant for each option. The model uses the data of Kizildere Geothermal Power Plant (KGPP) - Turkey, which is a single-flash plant with extremely high NCG fraction, to allow a comparison between the results of the modelling and the operational data of an actual single-flash GPP. Under given conditions, thermodynamic analysis resulted that NCG fraction is the most significant factor on GPP performance and the compressor system is the most efficient and robust option where the influence of the NCG fraction is limited. © 2009 Elsevier Ltd. All rights reserved.
Nugroho Agung Pambudi - One of the best experts on this subject based on the ideXlab platform.
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Exergy analysis and optimization of Dieng single-Flash geothermal power plant
Energy Conversion and Management, 2014Co-Authors: Nugroho Agung Pambudi, Ryuichi Itoi, Saeid Jalilinasrabady, Khasani JaelaniAbstract:Abstract Exergy analysis and optimization of a single-flash geothermal power plant are conducted by developing a mathematical model that is applied to the Dieng geothermal power plant in Indonesia. Calculations are conducted by using the Engineering Equation Solver (EES) code using methods based on the laws of thermodynamics. The exergy flow and efficiency are computed at several plant components, including the Separator, turbine, condenser, and for the whole power plant. The exergy of the geothermal fluid that is discharged from the production wells is estimated to be 59.52 MW. This amount of fluid produces 21.71 MW of electricity from the power plant overall, with second law efficiency to be 36.48%. There is a considerable amount of waste brine, amounting to 17.98% (10.70 MW) of the total available exergy, which is disposed of in the plant’s reservoir. The optimization of the plant is carried out by adjusting the Separator Pressure. The results show that a slight increase of 20 kW in the output power can be attained by lowering the Separator Pressure to 9 bar from 10 bar. The Grassmann diagram shows the exergy losses at each component in the power plant. The turbine and Separator losses are 7.51 MW (12.62%) and 8.04 MW (13.5%), respectively, while the cooling tower has an exergy loss of 2.62 MW (4.40%). The total condenser loss is 5.8 MW (9.75%).
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Exergy analysis and optimization of Dieng single-Flash geothermal power plant
Energy Conversion and Management, 2014Co-Authors: Nugroho Agung Pambudi, Ryuichi Itoi, Saeid Jalilinasrabady, Khasani JaelaniAbstract:Exergy analysis and optimization of a single-flash geothermal power plant are conducted by developing a mathematical model that is applied to the Dieng geothermal power plant in Indonesia. Calculations are conducted by using the Engineering Equation Solver (EES) code using methods based on the laws of thermodynamics. The exergy flow and efficiency are computed at several plant components, including the Separator, turbine, condenser, and for the whole power plant. The exergy of the geothermal fluid that is discharged from the production wells is estimated to be 59.52 MW. This amount of fluid produces 21.71 MW of electricity from the power plant overall, with second law efficiency to be 36.48%. There is a considerable amount of waste brine, amounting to 17.98% (10.70 MW) of the total available exergy, which is disposed of in the plant's reservoir. The optimization of the plant is carried out by adjusting the Separator Pressure. The results show that a slight increase of 20 kW in the output power can be attained by lowering the Separator Pressure to 9 bar from 10 bar. The Grassmann diagram shows the exergy losses at each component in the power plant. The turbine and Separator losses are 7.51 MW (12.62%) and 8.04 MW (13.5%), respectively, while the cooling tower has an exergy loss of 2.62 MW (4.40%). The total condenser loss is 5.8 MW (9.75%). © 2013 Elsevier Ltd. All rights reserved.
Mortaza Yari - One of the best experts on this subject based on the ideXlab platform.
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Comparative and parametric study of double flash and single flash/ORC combined cycles based on exergoeconomic criteria
Applied Thermal Engineering, 2015Co-Authors: Naser Shokati, Faramarz Ranjbar, Mortaza YariAbstract:In this study, double flash geothermal power cycle and single flash/ORC combined cycles with different organic fluids are used for power generation from geothermal fluid reservoir with given temperature. n-heptane, R141b, R113 and steam are selected as organic working fluids in ORC and NH3 is used as a reference working fluid in ORC in this study, as it is a common working fluid in geothermal power plants and Kalina. After energy and exergy analyses of the mentioned cycles, a comprehensive exergoeconomic analysis by developing cost balance and auxiliary equations for all components of the cycles using SPECO approach is done and all exergoeconomic parameters are calculated and these cycles are compared from thermodynamic and exergoeconomic viewpoints. Also a parametric study is performed and the effects on the thermodynamic and exergoeconomic performance of the considered cycles of such operating parameters as Separator Pressures in double flash geothermal power cycle and Separator Pressure and evaporation temperature in single flash/ORC combined cycles. The results show that although the highest values of first law efficiency and exergy efficiency among the mentioned cycles are related to single flash/ORC with steam but the minimum unit cost of produced power is related to double flash cycle. Also according to parametric study, with increasing evaporation temperature in single flash/ORC the value of CD,tot+Żtot parameters for all combined cycles except single flash/ORC with ammonia increases continuously.
N. Yildirim Ozcan - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic assessment of gas removal systems for single-flash geothermal power plants
Applied Thermal Engineering, 2009Co-Authors: N. Yildirim Ozcan, Gulden GokcenAbstract:Geothermal fluids contain non-condensable gases (NCGs) at various amounts. NCGs flow to a conventional geothermal power plant (GPP) with steam phase and should be withdrawn from the condenser by a gas removal system to prevent increase in condenser Pressure and consequently decrease in power generation. Therefore, to remove NCGs from the system is critical especially at high NCG fractions. In this study, the net power output and specific steam consumption of a single-flash GPP is evaluated depending on the Separator Pressure, NCG fraction and wet bulb temperature of the environment, and three different conventional gas removal options which are two-stage steam jet ejector system, two-stage hybrid system and two-stage compressor system. A simulation code is written in EES to model the plant for each option. The model uses the data of Kizildere Geothermal Power Plant (KGPP) - Turkey, which is a single-flash plant with extremely high NCG fraction, to allow a comparison between the results of the modelling and the operational data of an actual single-flash GPP. Under given conditions, thermodynamic analysis resulted that NCG fraction is the most significant factor on GPP performance and the compressor system is the most efficient and robust option where the influence of the NCG fraction is limited. © 2009 Elsevier Ltd. All rights reserved.
