Thermodynamic evaluation of a geothermal power plant for advanced exergy analysis

Keçebaş, Ali; Gökgedik, Harun

doi:10.1016/j.energy.2015.05.094

Cited by 33 publications

(9 citation statements)

References 38 publications

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“… In the unavoidable cycle, efficiencies of the expander and the pump are considered respectively 80% [24] and 95% [25], assuming this level the maximum that could be exceeded due to technological limitations.…”

Section: Assumptionsmentioning

confidence: 99%

Advanced exergy analysis for a bottoming organic rankine cycle coupled to an internal combustion engine

Galindo

Ruíz

Dolz

et al. 2016

Energy Conversion and Management

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This paper deals with the evaluation and analysis of a bottoming ORC cycle coupled to an IC engine by means of conventional and advanced exergy analysis. Using experimental data of an ORC coupled to a 2 l turbocharged engine, both conventional and advanced exergy analysis are carried out. Splitting the exergy in the advanced exergy analysis into unavoidable and avoidable provides a measure of the potential of improving the efficiency of this component. On the other hand, splitting the exergy into endogenous and exogenous provides information between interactions among system components. The result of this study shows that there is a high potential of improvement in this type of cycles. Although, from the conventional analysis, the exergy destruction rate of boiler is greater than the one of the expander, condenser and pump, the advanced exergy analysis suggests that the first priority of improvement should be given to the expander, followed by the pump, the condenser and the boiler. A total amount of 3.75 kW (36.5%) of exergy destruction rate could be lowered, taking account that only the avoidable part of the exergy destruction rate can be reduced.

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Section: Assumptionsmentioning

confidence: 99%

Advanced exergy analysis for a bottoming organic rankine cycle coupled to an internal combustion engine

Galindo

Ruíz

Dolz

et al. 2016

Energy Conversion and Management

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“…The thermodynamic properties of water, air and n-pentane in the developed code are provided by the COOLPROP program [20,21]. In the literature, there are many studies on thermodynamic modelling of binary GPP with ORC [22][23][24][25]. However, for the sake of simplicity, the thermodynamic balance equations at the component level used in the thermodynamic model of the system are not given in the text.…”

Section: Mass Energy and Exergy Analysesmentioning

confidence: 99%

Thermodynamic Optimization of Turbine Lines for Maximum Exergy Efficiency in a Binary Geothermal Power Plant

Keçebaş

2019

Hittite J. Sci. Eng.

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I n recent years due to the limited production and lifetime of fossil resources on earth, and their effects on the health of organisms and climate, awareness of renewable energy resources like geothermal energy has increased worldwide. Considering the issues mentioned in terms of Turkey, the importance of geothermal energy as renewable energy is obvious. Geothermal energy is a clean, safe and reliable source of renewable energy [1]. Generally high temperature resources (T>150 °C) are used for electricity production, while moderate (90 °C

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“…The pump input power is defined in (6), where ∆h pump isen is the isentropic pump work, η pump is the isentropic efficiency andṁ 3 is the mass flow rate. Since we assume that there are no pressure drops across the heat exchangers, i.e.…”

Section: ) Unit Operation Approximationsmentioning

confidence: 99%

“…Given the large number of ORC systems around the world and the potential for more to be installed due to the relatively abundant low-temperature geothermal resources, there is a considerable amount of literature on ORC modeling and optimization. Often these ORC plants are simulated using the sequential modular approach, via a standard modeling software such as Aspen Plus [3] or GateCycle [4], and then are subsequently optimized using heuristic methods or sophisticated algorithms [5], [6].…”

Section: Introductionmentioning

confidence: 99%

A systematic approach to modeling organic Rankine cycle systems for global optimization

Currie

Wilson

2017

2017 6th International Symposium on Advanced Control of Industrial Processes (AdCONIP)

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The demand for organic Rankine cycle (ORC) systems to be efficient and economically competitive drives the need for a reliable and robust modeling approach that is suitable for optimization. However existing commercial simulation software is not typically tailored for optimization and they generally cannot guarantee global optimum. This paper proposes a modeling approach to approximate a rigorous simulation model that is suitable for global optimization. This involves a combination of regression and thermodynamic analysis, in addition to integer programming techniques. Three different solvers, COBYLA, SCIP, and BARON are used to optimize the ORC model and are compared against each other to demonstrate the prospect of achieving the global optimum using this approach. In addition, this paper also presents a technique to improve the model accuracy by using a piecewise fit to approximate the output characteristic of the ORC unit operations.

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Thermodynamic evaluation of a geothermal power plant for advanced exergy analysis

Cited by 33 publications

References 38 publications

Advanced exergy analysis for a bottoming organic rankine cycle coupled to an internal combustion engine

Advanced exergy analysis for a bottoming organic rankine cycle coupled to an internal combustion engine

Thermodynamic Optimization of Turbine Lines for Maximum Exergy Efficiency in a Binary Geothermal Power Plant

A systematic approach to modeling organic Rankine cycle systems for global optimization

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