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Geothermal trigeneration systems with Organic Rankine Cycles: Evaluation of different plant configurations considering part load behaviour.

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Title: Geothermal trigeneration systems with Organic Rankine Cycles: Evaluation of different plant configurations considering part load behaviour.
Authors: Schifflechner, Christopher1 (AUTHOR) c.schifflechner@tum.de, Kuhnert, Lara1 (AUTHOR), Irrgang, Ludwig1 (AUTHOR), Dawo, Fabian1 (AUTHOR), Kaufmann, Florian1 (AUTHOR), Wieland, Christoph1 (AUTHOR), Spliethoff, Hartmut1 (AUTHOR)
Source: Renewable Energy: An International Journal. May2023, Vol. 207, p218-233. 16p.
Subject Terms: *Power plants, *Geothermal resources, Rankine cycle, Plant layout, Recuperators, Exergy, Magnetotellurics
Abstract: Due to the increasing importance of cooling applications, geothermal trigeneration systems might be of high interest in the future. This work aims at evaluating different plant layouts against the background of more advanced plant configurations and part load behaviour. Five different plant configurations are analysed for geothermal heat source temperatures between 110 and 150 °C. The highest net power output is achieved by an advanced serial-parallel configuration (ASPC), but in case of high heating and cooling demand, a standard serial-parallel configuration is more favourable. For the considered base demand scenario of 130 °C, the ASPC results in an annual net power generation of 20.94 GWh, which is 6.9% higher than the second favourable configuration. The application of a recuperator within the ORC system has a significant impact on the serial concepts, but only marginally increases the power output of the parallel layouts. Comparing two exergetic efficiencies highlights that the assumed definition can result in a different ranking of the plant layouts. Considering the exergy that is transferred from the brine to the trigeneration system reveals the highest exergetic efficiency for a serial configuration, while the focus on the available exergy flow reveals the highest efficiency for the ASPC layout. Considering a brine temperature of 130 °C results in a maximal achievable second law efficiency of 34.1% if evaluating the available exergy flow. The evaluation of the pay-back period reveals that the ASPC results in the shortest pay-back period of 13.8 years. • Investigation of several plant configurations considering part-load operation. • Highest net power output is achieved by an advanced serial-parallel configuration. • For each plant configuration, there is an optimal desorber temperature of the AC. • A pay-back period of 14 years can be achieved. [ABSTRACT FROM AUTHOR]
Copyright of Renewable Energy: An International Journal is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Geothermal trigeneration systems with Organic Rankine Cycles: Evaluation of different plant configurations considering part load behaviour.
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  Data: <searchLink fieldCode="AR" term="%22Schifflechner%2C+Christopher%22">Schifflechner, Christopher</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> c.schifflechner@tum.de</i><br /><searchLink fieldCode="AR" term="%22Kuhnert%2C+Lara%22">Kuhnert, Lara</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Irrgang%2C+Ludwig%22">Irrgang, Ludwig</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dawo%2C+Fabian%22">Dawo, Fabian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kaufmann%2C+Florian%22">Kaufmann, Florian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wieland%2C+Christoph%22">Wieland, Christoph</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Spliethoff%2C+Hartmut%22">Spliethoff, Hartmut</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Renewable+Energy%3A+An+International+Journal%22">Renewable Energy: An International Journal</searchLink>. May2023, Vol. 207, p218-233. 16p.
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  Data: *<searchLink fieldCode="DE" term="%22Power+plants%22">Power plants</searchLink><br />*<searchLink fieldCode="DE" term="%22Geothermal+resources%22">Geothermal resources</searchLink><br /><searchLink fieldCode="DE" term="%22Rankine+cycle%22">Rankine cycle</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+layout%22">Plant layout</searchLink><br /><searchLink fieldCode="DE" term="%22Recuperators%22">Recuperators</searchLink><br /><searchLink fieldCode="DE" term="%22Exergy%22">Exergy</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetotellurics%22">Magnetotellurics</searchLink>
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  Data: Due to the increasing importance of cooling applications, geothermal trigeneration systems might be of high interest in the future. This work aims at evaluating different plant layouts against the background of more advanced plant configurations and part load behaviour. Five different plant configurations are analysed for geothermal heat source temperatures between 110 and 150 °C. The highest net power output is achieved by an advanced serial-parallel configuration (ASPC), but in case of high heating and cooling demand, a standard serial-parallel configuration is more favourable. For the considered base demand scenario of 130 °C, the ASPC results in an annual net power generation of 20.94 GWh, which is 6.9% higher than the second favourable configuration. The application of a recuperator within the ORC system has a significant impact on the serial concepts, but only marginally increases the power output of the parallel layouts. Comparing two exergetic efficiencies highlights that the assumed definition can result in a different ranking of the plant layouts. Considering the exergy that is transferred from the brine to the trigeneration system reveals the highest exergetic efficiency for a serial configuration, while the focus on the available exergy flow reveals the highest efficiency for the ASPC layout. Considering a brine temperature of 130 °C results in a maximal achievable second law efficiency of 34.1% if evaluating the available exergy flow. The evaluation of the pay-back period reveals that the ASPC results in the shortest pay-back period of 13.8 years. • Investigation of several plant configurations considering part-load operation. • Highest net power output is achieved by an advanced serial-parallel configuration. • For each plant configuration, there is an optimal desorber temperature of the AC. • A pay-back period of 14 years can be achieved. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Renewable Energy: An International Journal is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.renene.2023.02.042
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      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: 218
    Subjects:
      – SubjectFull: Power plants
        Type: general
      – SubjectFull: Geothermal resources
        Type: general
      – SubjectFull: Rankine cycle
        Type: general
      – SubjectFull: Plant layout
        Type: general
      – SubjectFull: Recuperators
        Type: general
      – SubjectFull: Exergy
        Type: general
      – SubjectFull: Magnetotellurics
        Type: general
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      – TitleFull: Geothermal trigeneration systems with Organic Rankine Cycles: Evaluation of different plant configurations considering part load behaviour.
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            – D: 01
              M: 05
              Text: May2023
              Type: published
              Y: 2023
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              Value: 207
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            – TitleFull: Renewable Energy: An International Journal
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