Thermodynamic comparison of direct supercritical CO2 and indirect brine-ORC concepts for geothermal combined heat and power generation

Schifflechner, Christopher; Dawo, Fabian; Eyerer, Sebastian; Wieland, Christoph Martin; Spliethoff, Hartmut

doi:10.1016/j.renene.2020.07.044

Cited by 27 publications

(13 citation statements)

References 45 publications

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“…As discussed critically in Ref. [23], the evaluation of geothermal CHP concepts typically requires a consideration of part-load behaviour, as well as a focus of the annual achievable net power, since the heating demand of a DHS varies strongly over a year. Although Gabrielle's model [31] provides a part-load model as a function of the working fluid's density, the work by Dawo et al [32] indicates that this model may provide overly optimistic results for use with large-scale turbines in geothermal applications.…”

Section: Resmentioning

confidence: 99%

“…The further model parameters are taken from Refs. [12,21,23,24]. Table 1 summarises the main model parameters.…”

Section: System Parametersmentioning

confidence: 99%

“…Gladysz et al [21] and [22] investigate a two-staged serial concept for a potential CPG project in Poland. Schifflechner et al [23] compare the performance of a CPG system with a water-Organic Rankine Cycle (ORC) system for a CHP application, while proposing a combined serial-parallel concept for the CPG system.…”

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confidence: 99%

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CO2 Plume Geothermal (CPG) Systems for Combined Heat and Power Production: an Evaluation of Various Plant Configurations

2022

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CO2 Plume Geothermal (CPG) systems are a promising concept for utilising petrothermal resources in the context of a future carbon capture utilisation and sequestration economy. Petrothermal geothermal energy has a tremendous worldwide potential for decarbonising both the power and heating sectors. This paper investigates three potential CPG configurations for combined heating and power generation (CHP). The present work examines scenarios with reservoir depths of 4 km and 5 km, as well as required district heating system (DHS) supply temperatures of 70°C and 90°C. The results reveal that a two-staged serial CHP concept eventuates in the highest achievable net power output. For a thermosiphon system, the relative net power reduction by the CHP option compared with a sole power generation system is significantly lower than for a pumped system. The net power reduction for pumped systems lies between 62.6% and 22.9%. For a thermosiphon system with a depth of 5 km and a required DHS supply temperature of 70°C, the achievable net power by the most beneficial CHP option is even 9.2% higher than for sole power generation systems. The second law efficiency for the sole power generation concepts are in a range between 33.0% and 43.0%. The second law efficiency can increase up to 63.0% in the case of a CHP application. Thus, the combined heat and power generation can significantly increase the overall second law efficiency of a CPG system. The evaluation of the achievable revenues demonstrates that a CHP application might improve the economic performance of both thermosiphon and pumped CPG systems. However, the minimum heat revenue required for compensating the power reduction increases with higher electricity revenues. In summary, the results of this work provide valuable insights for the potential development of CPG systems for CHP applications and their economic feasibility.

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Section: Resmentioning

confidence: 99%

“…The further model parameters are taken from Refs. [12,21,23,24]. Table 1 summarises the main model parameters.…”

Section: System Parametersmentioning

confidence: 99%

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CO2 Plume Geothermal (CPG) Systems for Combined Heat and Power Production: an Evaluation of Various Plant Configurations

2022

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“…In theoretical analysis, the isentropic efficiency usually takes a fixed value that has not been verified by experiments. Table 1 briefly lists the selection of the isentropic efficiency of the pump (Mohammadzadeh Bina et al, 2017;Mateu-Royo et al, 2019;Shen et al, 2019;Wang and Fu, 2019;Altun and Kilic, 2020;Morais et al, 2020;Schifflechner et al, 2020;Jafary et al, 2021;Khoshgoftar Manesh et al, 2021;Wang et al, 2021). The experimental test showed that the diaphragm pump efficiency was 32% (Kosmadakis et al, 2016); the efficiency of the vane pump was 36.9% (Kim et al, 2017); the plunger pump efficiency was 33.6% (Chang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the current research on pumps is generally carried out on the test bench of the ORC system (Feng et al, 2019). Because the experimental test of the ORC system is generally carried out under a stable high- Wang et al (2021) 2021 Design and optimization of the ORC for marine engine waste heat recovery 80 Morais et al (2020) 2020 Economic, energetic, and exergetic analyses of a solar-biomass-ORC cooling cogeneration hybrid system 85 Altun and Kilic (2020) 2020 Thermodynamic evaluation of the ORC for geothermal power 80 Schifflechner et al (2020) 2020 Thermodynamic comparison of the supercritical CO 2 and ORC for geothermal combined heat and power generation 80 Wang and Fu (2019) 2019 Thermoeconomic analysis of the CCHP-ORC system 80 Shen et al (2019) 2019 Design and optimization of the ORC system 100 Mateu-Royo et al (2019) 2019 Multi-objective optimization of a high-temperature heat pump-ORC hybrid system 90 Mohammadzadeh Bina et al (2017) 2017 Thermoeconomic evaluation of the ORC for geothermal power 95…”

Section: Introductionmentioning

confidence: 99%

A Machine Learning Framework With an Intelligent Algorithm for Predicting the Isentropic Efficiency of a Hydraulic Diaphragm Metering Pump in the Organic Rankine Cycle System

Yao

Niu

et al. 2022

Front. Energy Res.

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The pump provides the necessary pressure and flow for the organic Rankine cycle (ORC) system. The traditional methods have obvious limitations when analyzing the time-varying characteristics of the key operating parameters of the pump. This study first introduces the scatter plot analysis method to analyze and evaluate the time-varying and coupling characteristics of the hydraulic diaphragm metering pump. Then, a machine learning-fitting algorithm hybrid model is constructed to solve and verify the actual matching correlation equation of the key operating parameters. In addition, the complicated non-linear relationship brings great challenges to obtaining the limit value of the pump isentropic efficiency. This study introduces the bilinear interpolation algorithm to systematically analyze the change trend between operating parameters and isentropic efficiency. Based on the wavelet neural network (WNN) with momentum term and particle swarm optimization-adaptive inertia weight adjusting (PSO-AIWA), a machine learning framework with an intelligent algorithm is constructed. Under this framework, the maximum isentropic efficiency of the pump can be stabilized at 70.22–74.67% under all working conditions. Through the theoretical analysis model, the effectiveness of this framework is evaluated. Finally, the optimal cycle parameters are evaluated. This study can provide direct significance for the analysis and optimization of the actual performance of the ORC system.

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Critical review of multigeneration system powered by geothermal energy resource from the energy, exergy, and economic point of views

Azizi

Esmaeilion

Moosavian

et al. 2022

Energy Science & Engineering

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Concerns about greenhouse gas emissions from fossil fuels have made the use of renewable sources the world's most important energy challenge. Among renewable energies, geothermal energy has a special place due to its sustainable resources and shallow environmental impacts. These energy sources are classified as low-grade thermal energy sources, so they cannot independently provide a high amount of thermal energy. Therefore, extensive studies have been conducted on practical methods of using geothermal energy for multigeneration productions. Studies on geothermal energy-based systems to supply energy to various systems such as chillers, electrolyzers, turbines, and desalination units are reviewed in this study. As the methods, scenarios, and practical possibilities of multigenerational system (MGS) are limited, in this study, while expressing the limitations and problems of these systems, the most critical issues raised in this issue are examined and analyzed, and compatibility, products, Levelized cost of energy, energy and exergy efficiencies, and technical issues are summarized. Also, due to the limitations of geothermal energy sources in recent studies, their combination with other renewable energy sources has been evaluated. Therefore, the classification of studies conducted to combine renewable energy sources with the geothermal system to achieve multigeneration productions is thrown in the last part of this study. The results of the studies show that the combination of geothermal energy with other renewable energy sources is used in 90% of cases to provide heat and cold load and in 10% of cases to generate electrical power. These systems also improve energy and exergy efficiency and economic viability by increasing stability.

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Thermodynamic comparison of direct supercritical CO2 and indirect brine-ORC concepts for geothermal combined heat and power generation

Cited by 27 publications

References 45 publications

CO2 Plume Geothermal (CPG) Systems for Combined Heat and Power Production: an Evaluation of Various Plant Configurations

CO2 Plume Geothermal (CPG) Systems for Combined Heat and Power Production: an Evaluation of Various Plant Configurations

A Machine Learning Framework With an Intelligent Algorithm for Predicting the Isentropic Efficiency of a Hydraulic Diaphragm Metering Pump in the Organic Rankine Cycle System

Critical review of multigeneration system powered by geothermal energy resource from the energy, exergy, and economic point of views

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