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Mehmet Kanoglu - One of the best experts on this subject based on the ideXlab platform.

  • Exergetic cost evaluation of hydrogen production Powered by combined flash-binary Geothermal Power Plant
    International Journal of Hydrogen Energy, 2015
    Co-Authors: Ceyhun Yilmaz, Mehmet Kanoglu, Aysegul Abusoglu
    Abstract:

    A combined flash-binary Geothermal Plant and a water electrolysis unit for hydrogen production are considered and thermodynamic and exergoeconomic analyses of the system are performed. A liquid Geothermal water resource at 200 °C with a flow rate of 100 kg/s is considered. The Power produced in the Plant is used for the electrolysis process. The electrolysis water can be preheated to 70 °C by the Geothermal water leaving the Power Plant and hydrogen can be produced at a rate of 0.0498 kg/s. The exergy efficiency of the Power Plant and the overall system are calculated to be 46.6% and 45.8%, respectively. The unit exergetic cost of electricity from the Power Plant is 11.1 $/GJ (or 0.0400 $/kWh) and that of the produced hydrogen is 26.1 $/GJ (or 3.14 $/kg H2).

  • thermodynamic evaluation of Geothermal energy Powered hydrogen production by pem water electrolysis
    Energy, 2014
    Co-Authors: Ceyhun Yilmaz, Mehmet Kanoglu
    Abstract:

    Thermodynamic energy and exergy analysis of a PEM water electrolyzer driven by Geothermal Power for hydrogen production is performed. For this purpose, work is produced from a Geothermal resource by means of the organic Rankine cycle; the resulting work is used as a work input for an electrolysis process; and electrolysis water is preheated by the waste Geothermal water. The first and second-law based performance parameters are identified for the considered system and the system performance is evaluated. The effects of Geothermal water and electrolysis temperatures on the amount of hydrogen production are studied and these parameters are found to be proportional to each other. We consider a Geothermal resource at 160 °C available at a rate of 100 kg/s. Under realistic operating conditions, 3810 kW Power can be produced in a binary Geothermal Power Plant. The produced Power is used for the electrolysis process. The electrolysis water can be preheated to 80 °C by the Geothermal water leaving the Power Plant and hydrogen can be produced at a rate of 0.0340 kg/s. The energy and exergy efficiencies of the binary Geothermal Power Plant are 11.4% and 45.1%, respectively. The corresponding efficiencies for the electrolysis system are 64.0% and 61.6%, respectively, and those for the overall system are 6.7% and 23.8%, respectively.

  • thermal design of alkaline water electrolysis assisted by combined flash binary Geothermal Power Plant
    ASME 2013 International Mechanical Engineering Congress and Exposition, 2013
    Co-Authors: Mehmet Kanoglu, Ceyhun Yilmaz
    Abstract:

    The purpose of this study is thermoeconomic performance evaluation of alkaline water hydrogen production assisted by Geothermal energy. In this study energy, exergy and cost balances of combined systems of each component for hydrogen production assisted by Geothermal energy will be written. Exergy of each involved stream will be calculated and the exergetic balance of each subsystem will be assessed, as well as the global system, identifying and quantifying losses. This will allow thermodynamic performances of combined systems and each component. This information will be relevant to optimize the system performance from an economical point of view.We consider a Geothermal resource at 230°C available at a rate of 230 kg/s. Under realistic operating conditions, 21545 kW Power can be produced in a Power Plant. The produced Power is used for the electrolysis process. The electrolysis water can be preheated to 67.6°C by the Geothermal water leaving the Power Plant and hydrogen can be produced at a rate of 0.1125 kg/s. Also, combine flash binary Geothermal Power Plant energy and exergy efficiencies are calculated to be 12.1% and 57.4% at this condition. Electrolysis system energy and exergy efficiencies are calculated to be 71.4% and 60.7% of Geothermal water temperature at 230°C and Geothermal water flow rate at 230 kg/s. We evaluated at unit exergetic cost of electricity combined flash binary system is 10.1$/GJ (0.0364 $/kWh) and unit exergetic cost of hydrogen is 34.6$/GJ (4.16 $/kg H2).Copyright © 2013 by ASME

  • performance and parametric investigation of a binary Geothermal Power Plant by exergy
    Renewable Energy, 2008
    Co-Authors: Mehmet Kanoglu, Ali Bolatturk
    Abstract:

    Exergy analysis of a binary Geothermal Power Plant is performed using actual Plant data to assess the Plant performance and pinpoint sites of primary exergy destruction. Exergy destruction throughout the Plant is quantified and illustrated using an exergy diagram, and compared to the energy diagram. The sites with greater exergy destructions include brine reinjection, heat exchanger and condenser losses. Exergetic efficiencies of major Plant components are determined in an attempt to assess their individual performances. The energy and exergy efficiencies of the Plant are 4.5% and 21.7%, respectively, based on the energy and exergy of Geothermal water at the heat exchanger inlet. The energy and exergy efficiencies are 10.2% and 33.5%, respectively, based on the heat input and exergy input to the binary Rankine cycle. The effects of turbine inlet pressure and temperature and the condenser pressure on the exergy and energy efficiencies, the net Power output and the brine reinjection temperature are investigated and the trends are explained.

  • exergy analysis of a dual level binary Geothermal Power Plant
    Geothermics, 2002
    Co-Authors: Mehmet Kanoglu
    Abstract:

    Exergy analysis of a 12.4 MW existing binary Geothermal Power Plant is performed using actual Plant data to assess the Plant performance and pinpoint sites of primary exergy destruction. Exergy destruction throughout the Plant is quantified and illustrated using an exergy flow diagram, and compared to the energy flow diagram. The causes of exergy destruction in the Plant include the exergy of the working fluid lost in the condenser, the exergy of the brine reinjected, the turbine-pump losses, and the preheater–vaporizer losses. The exergy destruction at these sites accounts for 22.6, 14.8, 13.9, and 13.0% of the total exergy input to the Plant, respectively. Exergetic efficiencies of major Plant components are determined in an attempt to assess their individual performances. The exergetic efficiency of the Plant is determined to be 29.1% based on the exergy of the Geothermal fluid at the vaporizer inlet, and 34.2% based on the exergy drop of the brine across the vaporizer–preheater system (i.e. exergy input to the Rankine cycle). For comparison, the corresponding thermal efficiencies for the Plant are calculated to be 5.8 and 8.9%, respectively.

Tubagus Ahmad Fauzi Soelaiman - One of the best experts on this subject based on the ideXlab platform.

  • dry steam cycle application for excess steam utilization kamojang Geothermal Power Plant case study
    Renewable Energy, 2018
    Co-Authors: Lukman Adi Prananto, Riza Mochamad Iqbal, Firman Bagja Juangsa, Muhammad Aziz, Tubagus Ahmad Fauzi Soelaiman
    Abstract:

    Abstract This study investigated the utilization of available excess steam by the Kamojang Geothermal Power Plant, which, owing to the vapor-domination of the steam, utilizes a dry steam cycle. A model of the system was validated against actual Kamojang Unit-2 data and found to produce accurate results within a low discrepancy level (

  • Use of the Kalina cycle as a bottoming cycle in a Geothermal Power Plant: Case study of the Wayang Windu Geothermal Power Plant
    Applied Thermal Engineering, 2018
    Co-Authors: Lukman Adi Prananto, Bobby Irawan Mahendranata, Ilman Nuran Zaini, Firman Bagja Juangsa, Muhammad Aziz, Tubagus Ahmad Fauzi Soelaiman
    Abstract:

    This study focuses on the use of brine discharged from Geothermal fluid at the Wayang Windu Geothermal Power Plant. The Kalina cycle system (KCS) is investigated in an effort to generate electricity from the unused brine. This scheme develops KCS 11 owing to good performance at low to mid-range temperatures. Owing to impurities and the SiO2content in brine, the brine temperature at the outlet of the evaporator is maintained higher than the minimum silica saturation index standard. The ideal performance of the system is obtained with the optimization of the ammonia–water mixture and pinch temperature of the heat exchangers. Moreover, heat exchanger utilities (i.e., evaporators and recuperators) are designed in detail to analyze the feasibility of the system. An air-cooled condenser is adopted in the system owing the remote location surrounded by mountains. The designed system generates 1660.30 kW of electricity with thermal efficiency of 13.20%. Considering the zero cost of brine, this system is expected to be the solution for optimizing electricity generation in Indonesia.

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

  • performance optimization and improvement of a flash binary Geothermal Power Plant using zeotropic mixtures with pso algorithm
    Geothermics, 2018
    Co-Authors: Mohammadreza Kolahi, Arash Nemati, Mortaza Yari
    Abstract:

    Abstract This paper presents a novel approach for optimizing and also improving a flash-binary Geothermal Power Plant whose binary cycle is an organic Rankine cycle (ORC) which is using various combinations of zeotropic mixtures as working fluid. All of the obtained results are optimized with particle swarm optimization (PSO) method for maximum total output Power which is the objective function of the problem. First, the optimization is performed in the certain amounts of mixtures’ mass fractions. Then, the optimal values for the mass fractions are found. The results indicate that Pentane containing combinations show better performances. For instance, when the ORC unit is using the mixture of Pentane(0.45)/Butane(0.55) the highest output Power is gaining: 1376.87 (kW) from the ORC unit and 5726.44 (kW) from the whole system. Also, the highest improvements in utilization of zeotropic mixture instead of pure fluids are obtained by this mixture which are 18.769 (%) with respect to ORC's output Power and 3.950 (%) with respect to total output Power. Finally, an investigation on flash chamber pressure effect on the system performance is accomplished and the results reveal that with increasing the pressure, the total output Power decreases. Although lower flash chamber pressure seems to be a suitable choice, the investigation on the size parameters (SP) of the turbines shows that it is better to choose a mean amount of pressure for the flash chamber, thereby having the affordable amounts for the size parameters and also obtaining an adequate amount of total output Power.

  • exergetic analysis of various types of Geothermal Power Plants
    Renewable Energy, 2010
    Co-Authors: Mortaza Yari
    Abstract:

    Based on available surveys, it has been shown that Iran has substantial Geothermal potential in the north and north-western provinces, where in some places the temperature reaches 240°C. In order to better exploit these renewable resources, it is necessary to study this area. Thus, the aim of this paper is a comparative study of the different Geothermal Power Plant concepts, based on the exergy analysis for high-temperature Geothermal resources. The considered cycles for this study are a binary Geothermal Power Plant using a simple organic Rankine cycle (ORC), a binary Geothermal Power Plant using an ORC with an internal heat exchanger (IHE), a binary cycle with a regenerative ORC, a binary cycle with a regenerative ORC with an IHE, a single-flash Geothermal Power Plant, a double-flash Geothermal Power Plant and a combined flash-binary Power Plant. With respect to each cycle, a thermodynamic model had to be developed. Model validation was undertaken using available data from the literature. Based on the exergy analysis, a comparative study was done to clarify the best cycle configuration. The performance of each cycle has been discussed in terms of the second-law efficiency, exergy destruction rate, and first-law efficiency. Comparisons between the different Geothermal Power Plant concepts as well as many approaches to define efficiencies have been presented. The maximum first-law efficiency was found to be related to the ORC with an IHE with R123 as the working fluid and was calculated to be 7.65%. In contrast, the first-law efficiency based on the energy input into the ORC revealed that the binary cycle with the regenerative ORC with an IHE and R123 as the working fluid has the highest efficiency (15.35%). Also, the maximum first-law efficiency was shown to be given by the flash-binary with R123 as the working fluid and was calculated to be 11.81%.

Saeid Jalilinasrabady - One of the best experts on this subject based on the ideXlab platform.

  • preliminary analysis of single flash combined with binary system using thermodynamic assessment a case study of dieng Geothermal Power Plant
    International Journal of Sustainable Engineering, 2015
    Co-Authors: Nugroho Agung Pambudi, Saeid Jalilinasrabady, Ryuichi Itoi, Puji Sirait, Khasani Jaelani
    Abstract:

    This paper addressed the performance of single flash combined with a binary system that was proposed in the Dieng Geothermal Power Plant by applying thermodynamic assessment methods. A set of mathematical equations from the Plant was developed and solved iteratively using engineering equation solver. The results showed that the available exergy of the produced fluid from production wells is 66,204 kW. The performance of an existing single-flash Power Plant indicated 24,300 kW of net Power output. The proposed design of single flash combined with a binary system improves the Power output by 17.16% to 27,786 kW. The second law efficiency increases from 36.7% to 41.97% while the first law efficiency increases from 11.62% to 13.61%.

  • Exergy analysis and optimization of Dieng single-Flash Geothermal Power Plant
    Energy Conversion and Management, 2014
    Co-Authors: Nugroho Agung Pambudi, Saeid Jalilinasrabady, Ryuichi Itoi, Khasani Jaelani
    Abstract:

    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%).

  • flash cycle optimization of sabalan Geothermal Power Plant employing exergy concept
    Geothermics, 2012
    Co-Authors: Saeid Jalilinasrabady, Ryuichi Itoi, Pall Valdimarsson, Gudrun Saevarsdottir, Hikari Fujii
    Abstract:

    The Sabalan Geothermal field in northwest Iran is currently under development. A single flash cycle has been selected for Power generation. The analysis of the proposed design shows the maximum net Power output of the Plant can reach 31 MW if the pressures of the separator and condenser are 5.5 and 0.3 bar, respectively. To achieve optimum energy utilization, a double flash cycle was also evaluated for Power generation. The results indicate the maximum net Power output of the Plant reaches 49.7 MW if the pressures for the high- and low-pressure steps and condenser are 7.5, 1.1, and 0.1 bar, respectively. Mathematical models for energy and exergy flows were developed and implemented in Engineering Equation Solver (EES) software. In the single flash cycle, the energy and exergy of the waste water were calculated as 54.8% and 41.4% of the total available energy and exergy, respectively. The energy and exergy of waste water were respectively calculated as 19.88% and 15.3% of the total available energy and exergy, in the double flash cycle. The parts of the system with largest exergy destruction in both cycles were compared and the overall exergy and energy efficiencies for the Power Plant were calculated. The total exergy available from production wells at Sabalan was calculated to be 111 MW for the single flash system, and 114 MW for the double flash system. The results of the analysis suggest a double flash cycle system for the Sabalan Power Plant.

  • Flash Cycle and Binary Geothermal Power Plant Optimization
    Transactions - Geothermal Resources Council 36, 2012
    Co-Authors: Saeid Jalilinasrabady, Ryuichi Itoi
    Abstract:

    This research was conducted to provide a guide or reference that could quickly and easily be used to determine the optimum Power output and choose the most efficient energy conversion technology. Three energy conversion models were analyzed and simulated. A single flash Plant was chosen as the main energy conversion system due to its simplicity and reliability. Two other energy conversion systems were considered as the bottoming unit of the single flash, double flash and Organic Rankine Cycle (ORC). Also their combination with district heating system was investigated. Engineering equation solver software (EES) was used for modeling and simulation. Comparison of Power output for three cycles show that ORC cycle is more efficient from the view of Power output. Also it has the highest thermal efficiency when district heating is added for heat recovery of waste heat from Plant.

Ryuichi Itoi - One of the best experts on this subject based on the ideXlab platform.

  • preliminary analysis of single flash combined with binary system using thermodynamic assessment a case study of dieng Geothermal Power Plant
    International Journal of Sustainable Engineering, 2015
    Co-Authors: Nugroho Agung Pambudi, Saeid Jalilinasrabady, Ryuichi Itoi, Puji Sirait, Khasani Jaelani
    Abstract:

    This paper addressed the performance of single flash combined with a binary system that was proposed in the Dieng Geothermal Power Plant by applying thermodynamic assessment methods. A set of mathematical equations from the Plant was developed and solved iteratively using engineering equation solver. The results showed that the available exergy of the produced fluid from production wells is 66,204 kW. The performance of an existing single-flash Power Plant indicated 24,300 kW of net Power output. The proposed design of single flash combined with a binary system improves the Power output by 17.16% to 27,786 kW. The second law efficiency increases from 36.7% to 41.97% while the first law efficiency increases from 11.62% to 13.61%.

  • Exergy analysis and optimization of Dieng single-Flash Geothermal Power Plant
    Energy Conversion and Management, 2014
    Co-Authors: Nugroho Agung Pambudi, Saeid Jalilinasrabady, Ryuichi Itoi, Khasani Jaelani
    Abstract:

    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%).

  • flash cycle optimization of sabalan Geothermal Power Plant employing exergy concept
    Geothermics, 2012
    Co-Authors: Saeid Jalilinasrabady, Ryuichi Itoi, Pall Valdimarsson, Gudrun Saevarsdottir, Hikari Fujii
    Abstract:

    The Sabalan Geothermal field in northwest Iran is currently under development. A single flash cycle has been selected for Power generation. The analysis of the proposed design shows the maximum net Power output of the Plant can reach 31 MW if the pressures of the separator and condenser are 5.5 and 0.3 bar, respectively. To achieve optimum energy utilization, a double flash cycle was also evaluated for Power generation. The results indicate the maximum net Power output of the Plant reaches 49.7 MW if the pressures for the high- and low-pressure steps and condenser are 7.5, 1.1, and 0.1 bar, respectively. Mathematical models for energy and exergy flows were developed and implemented in Engineering Equation Solver (EES) software. In the single flash cycle, the energy and exergy of the waste water were calculated as 54.8% and 41.4% of the total available energy and exergy, respectively. The energy and exergy of waste water were respectively calculated as 19.88% and 15.3% of the total available energy and exergy, in the double flash cycle. The parts of the system with largest exergy destruction in both cycles were compared and the overall exergy and energy efficiencies for the Power Plant were calculated. The total exergy available from production wells at Sabalan was calculated to be 111 MW for the single flash system, and 114 MW for the double flash system. The results of the analysis suggest a double flash cycle system for the Sabalan Power Plant.

  • Flash Cycle and Binary Geothermal Power Plant Optimization
    Transactions - Geothermal Resources Council 36, 2012
    Co-Authors: Saeid Jalilinasrabady, Ryuichi Itoi
    Abstract:

    This research was conducted to provide a guide or reference that could quickly and easily be used to determine the optimum Power output and choose the most efficient energy conversion technology. Three energy conversion models were analyzed and simulated. A single flash Plant was chosen as the main energy conversion system due to its simplicity and reliability. Two other energy conversion systems were considered as the bottoming unit of the single flash, double flash and Organic Rankine Cycle (ORC). Also their combination with district heating system was investigated. Engineering equation solver software (EES) was used for modeling and simulation. Comparison of Power output for three cycles show that ORC cycle is more efficient from the view of Power output. Also it has the highest thermal efficiency when district heating is added for heat recovery of waste heat from Plant.