Comparative and parametric study of double flash and single flash/ORC combined cycles based on exergoeconomic criteria

Shokati, Naser; Ranjbar, Faramarz; Yari, Mortaza

doi:10.1016/j.applthermaleng.2015.08.031

Cited by 109 publications

(16 citation statements)

References 53 publications

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“…Single flash/ORC combined systems with different organic fluids are analyzed from energy, exergy, exergoeconomic and thermoeconomic points. The results show that the flash-binary system had a higher first low efficiency, exergy efficiency and unit cost of produced power compared with the double flash system [14]. For water-dominated geothermal resource, when the temperature ranges from 110-160 °C, an important merit parameter was recommended as an objective function for optimal design, which can be considered, is the mass-flow rate to generate a fixed power output, or specific brine consumption [15].…”

Section: Introductionmentioning

confidence: 99%

The steady thermodynamics of a flash-binary geothermal power system based on correction models validated by static tests

et al. 2020

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The operation parameters and performance of a flash-binary power system are analyzed based on four scenarios of the experiment, optimum design, error correction Model 1 and error correction Model 2. The operation parameters of a flash-binary power system are tested to explain steady in the experiment with heat source temperature ranges from 100-150°C. The results show that the simulation data of error correction Model 2 have a good agreement with the experiment and most parameter values of relative error, δ, are less than 5%. The expander with low isotropic efficiency results in the largest exergy losses in the flash-binary power system. The flash-binary power system has better performance to adapt to the mid-high temperature geothermal resource in China. Some valuable data obtained from the research can be applied in the future power plant construction in China's southern Tibet, western Yunnan and Sichuan.

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Section: Introductionmentioning

confidence: 99%

The steady thermodynamics of a flash-binary geothermal power system based on correction models validated by static tests

et al. 2020

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“…The results show that the optimum electricity production is founded with respect to the pressure of the flash chamber and turbine input pressure for double-flash and integrated flash-binary cycles. Shokati et al [8] investigated about the single and binary-flash cycle comparison under thermoeconomic vantage point. Based on this work, the best first and second thermodynamic law efficiencies are founded for the single-flash Organic Rankine Cycle.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic performance analysis and optimization of a power and hydrogen generation system based on geothermal flash, dual-pressure organic Rankine cycle using zeotropic mixtures, and PEM electrolyzer

Talesh¹

2020

Preprint

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In this study, a thermodynamic model and optimization of a flash-binary geothermal system are proposed for power and hydrogen production. The binary cycles contain a dual-pressure ORC cycle and proton exchange membrane electrolyzer for power and hydrogen production. The combination of dual-pressure organic Rankine cycle with zeotropic mixtures enhances the performance of the system considerably, and selection of the best kind of zeotropic mixture as the working fluids of the DORC unit is one of the important methods to improve the performance of the suggested system. Also, the Genetic algorithm is employed to optimize the net output power of the system, in which the results of optimization show that the best performance belongs to Pentane (0.467)/Butane (0.533) with first and second-law efficiencies of 16.66%, 58.03%, respectively, and hydrogen production of 0.3683 kg/hr. Besides, for the base case simulation, the energy and exergy efficiencies of the whole system are reported by about 16.66% and 58.03%, respectively, also for this condition, the derived power from the proposed model and overall exergy destruction is calculated approximately 132.41 kW, and 90.08 kW, respectively and geothermal heat source generates 0.306 kg/hr hydrogen by the proton exchange membrane electrolyzer.

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“…Most models focus on the size of the turbine, not on its complexity [73,88] or use the mentioned cost functions for steam turbines [89,90]. The newly developed model aims to account for both, the size and also the complexity of the turbine and to be ORC specific.…”

Section: Turbinementioning

confidence: 99%

Thermoeconomic Evaluation of Modular Organic Rankine Cycles for Waste Heat Recovery over a Broad Range of Heat Source Temperatures and Capacities

Preißinger

Brüggemann

2017

Energies

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Industrial waste heat recovery by means of an Organic Rankine Cycle (ORC) can contribute to the reduction of CO 2 emissions from industries. Before market penetration, high efficiency modular concepts have to be developed to achieve appropriate economic value for industrial decision makers. This paper aims to investigate modularly designed ORC systems from a thermoeconomic point of view. The main goal is a recommendation for a suitable chemical class of working fluids, preferable ORC design and a range of heat source temperatures and thermal capacities in which modular ORCs can be economically feasible. For this purpose, a thermoeconomic model has been developed which is based on size and complexity parameters of the ORC components. Special emphasis has been laid on the turbine model. The paper reveals that alkylbenzenes lead to higher exergetic efficiencies compared to alkanes and siloxanes. However, based on the thermoeconomic model, the payback periods of the chemical classes are almost identical. With the ORC design, the developed model and the boundary conditions of this study, hexamethyldisiloxane is a suitable working fluid and leads to a payback period of less than 5 years for a heat source temperature of 400 to 600 • C and a mass flow rate of the gaseous waste heat stream of more than 4 kg/s.

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Comparative and parametric study of double flash and single flash/ORC combined cycles based on exergoeconomic criteria

Cited by 109 publications

References 53 publications

The steady thermodynamics of a flash-binary geothermal power system based on correction models validated by static tests

The steady thermodynamics of a flash-binary geothermal power system based on correction models validated by static tests

Thermodynamic performance analysis and optimization of a power and hydrogen generation system based on geothermal flash, dual-pressure organic Rankine cycle using zeotropic mixtures, and PEM electrolyzer

Thermoeconomic Evaluation of Modular Organic Rankine Cycles for Waste Heat Recovery over a Broad Range of Heat Source Temperatures and Capacities

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