Thermodynamic evaluation of solar-geothermal hybrid power plants in northern Chile

Cardemil, José M.; Cortés, Felipe Ignacio Arreguín; Díaz, Andrés J.; Escobar, Rodrigo

doi:10.1016/j.enconman.2016.06.032

Cited by 75 publications

(20 citation statements)

References 19 publications

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“…With the assistance of solar heat, up to an 11.6% increase in energy production from the geothermal brine is obtained for the Peak Power mode, whereas savings of up to 10.3% in the use of geothermal resources is obtained for the Save Geothermal Resource mode. Cardemil et al [ 12 ] conducted energetic and exergetic analyses for hypothetical single- and double-flash geothermal power plants, with each having four different brine characteristics, taking Save Geothermal Resource and Peak Power modes into account. A PTC field is used to supply solar heat to the system after the separator, both to the geothermal brine and as additional steam and superheat, respectively.…”

Section: Introductionmentioning

confidence: 99%

Development and Analysis of the Novel Hybridization of a Single-Flash Geothermal Power Plant with Biomass Driven sCO2-Steam Rankine Combined Cycle

Mutlu

Baker

Kazanç

2021

Entropy

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This study investigates the hybridization scenario of a single-flash geothermal power plant with a biomass-driven sCO2-steam Rankine combined cycle, where a solid local biomass source, olive residue, is used as a fuel. The hybrid power plant is modeled using the simulation software EBSILON®Professional. A topping sCO2 cycle is chosen due to its potential for flexible electricity generation. A synergy between the topping sCO2 and bottoming steam Rankine cycles is achieved by a good temperature match between the coupling heat exchanger, where the waste heat from the topping cycle is utilized in the bottoming cycle. The high-temperature heat addition problem, common in sCO2 cycles, is also eliminated by utilizing the heat in the flue gas in the bottoming cycle. Combined cycle thermal efficiency and a biomass-to-electricity conversion efficiency of 24.9% and 22.4% are achieved, respectively. The corresponding fuel consumption of the hybridized plant is found to be 2.2 kg/s.

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Section: Introductionmentioning

confidence: 99%

Development and Analysis of the Novel Hybridization of a Single-Flash Geothermal Power Plant with Biomass Driven sCO2-Steam Rankine Combined Cycle

Mutlu

Baker

Kazanç

2021

Entropy

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“…The contribution of each component to the total exergy destruction was computed and illustrated in Grassman plot. Cardemil et al [ 15 ] presented a thermodynamics analysis using the first and second laws for the performance of single and double-stage geothermal power plants coupled by a parabolic through solar concentrating collector field, the influence of second law efficiency was discussed in every configuration allowed to identify the best engineering solution in the functioning of reservoir conditions, in all previous economic analyses were carried out based on the cost of electricity in northern Chile. Rudiyanto et al [ 16 ] presented the exergy assessment of the Kamojang geothermal power plant in Indonesia, the exergy destruction of each component of the entire cycle was tabulated and discussed, the main condenser was designated as the most inefficient components around of 180 MW of exergy destruction, additionally the authors presented the influence of the environmental temperature on the exergy destruction in the turbine.…”

Section: Introductionmentioning

confidence: 99%

“…The heat and power balances for each component are taken according to [21]. Additionally, the second law efficiency proposed by [15] is used according to the following expression:…”

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confidence: 99%

Exergy Analysis Using a Theoretical Formulation of a Geothermal Power Plant in Cerro Prieto, México

Colorado-Garrido

Alcalá

Alaffita-Hernández

et al. 2021

Entropy

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The purpose of this research is the calculation of the exergy destruction of the single-flash and double-flash cycles of a geothermal power plant located on the ladder of the 233 m Cerro Prieto volcano, on the alluvial plain of the Mexicali Valley, Mexico. The methodology developed in this research presents thermodynamic models for energy and exergy flows, which allows determining the contribution of each component to the total exergy destruction of the system. For the case-base, the results indicate that for the single-flash configuration the efficiency of the first and second law of thermodynamics are 0.1888 and 0.3072, as well as the highest contribution to the total exergy destruction is provided by the condenser. For the double-flash configuration, the efficiency of the first and second law of thermodynamics are 0.3643 and 0.4983. The highest contribution to the total exergy destruction is provided by the condenser and followed by the low-pressure turbine.

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“…Geothermal power plants utilize the hot geothermal water or fluid present in the ground to generate power. Thus, providing an environmentally benign method of power generation [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Different configurations and methodologies of geothermal entailing power generation exist depending on the method of energy transfer from the hot geothermal fluid to the power cycle working fluid.…”

Section: Introductionmentioning

confidence: 99%

Exergetic Performance Investigation of Varying Flashing From Single to Quadruple for Geothermal Power Plants

Siddiqui

Dinçer

2019

Journal of Energy Resources Technology

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Geothermal power plants are considered important renewable energy resources for clean energy production. Flash steam type plants constitute a significant portion of worldwide geothermal power. In this study, single, double, triple, and quadruple flash steam geothermal power plants are investigated with reinjection options. The optimal operating points are determined specifically through optimal flashing pressures. The turbine power outputs, energy efficiencies, and exergy efficiencies are further studied. A rise in the flashing stages from single to double is found to increase the power outputs considerably. However, when the flashing stages are increased from double to triple and triple to quadruple, the increase in turbine power outputs is found to drop significantly. Also, both exergy efficiency and energy efficiency are found to reduce with increasing number of flash stages. The energy efficiencies are obtained as 28%, 25.5%, 24.2%, and 23.5% for single, double, triple, and quadruple plants, respectively. Furthermore, the exergy efficiencies are found to be 72.6%, 70.9%, 70.2%, and 69.8% for these plants, respectively.

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Thermodynamic evaluation of solar-geothermal hybrid power plants in northern Chile

Cited by 75 publications

References 19 publications

Development and Analysis of the Novel Hybridization of a Single-Flash Geothermal Power Plant with Biomass Driven sCO2-Steam Rankine Combined Cycle

Development and Analysis of the Novel Hybridization of a Single-Flash Geothermal Power Plant with Biomass Driven sCO2-Steam Rankine Combined Cycle

Exergy Analysis Using a Theoretical Formulation of a Geothermal Power Plant in Cerro Prieto, México

Exergetic Performance Investigation of Varying Flashing From Single to Quadruple for Geothermal Power Plants

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