Performance of Supercritical CO<sub>2</sub> Power Cycle and Its Turbomachinery with the Printed Circuit Heat Exchanger with Straight and Zigzag Channels
Since printed circuit heat exchangers (PCHE) are the largest modules of a supercritical carbon dioxide Brayton cycle, they can considerably affect the whole system’s performance and layout. Straight-channel and zigzag-channel printed circuit heat exchangers have frequently been analyzed in the stand...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/1/62 |
| _version_ | 1797543582446387200 |
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| author | Muhammed Saeed Khaled Alawadi Sung Chul Kim |
| author_facet | Muhammed Saeed Khaled Alawadi Sung Chul Kim |
| author_sort | Muhammed Saeed |
| collection | DOAJ |
| description | Since printed circuit heat exchangers (PCHE) are the largest modules of a supercritical carbon dioxide Brayton cycle, they can considerably affect the whole system’s performance and layout. Straight-channel and zigzag-channel printed circuit heat exchangers have frequently been analyzed in the standalone mode and repeatedly proposed for <inline-formula><math display="inline"><semantics><mrow><mi>s</mi><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>−</mo><mi>B</mi><mi>C</mi></mrow></semantics></math></inline-formula>. However, the impact of heat exchanger designs with straight and zigzag-channel configurations on the performance of the cycle and its components, i.e., the turbine and compressor, has not been studied. In this context, this study evaluates the effect of different heat exchanger designs with various values of effectiveness (<inline-formula><math display="inline"><semantics><mi>ϵ</mi></semantics></math></inline-formula>), inlet Reynolds number (Re), and channel configuration (zigzag and straight channel) on the overall performance of the <inline-formula><math display="inline"><semantics><mrow><mi>s</mi><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>−</mo><mi>B</mi><mi>C</mi></mrow></semantics></math></inline-formula> and its components. For the design and analysis of PCHEs, an in-house PCHE design and analysis code (PCHE-DAC) was developed in the MATLAB environment. The <inline-formula><math display="inline"><semantics><mrow><mi>s</mi><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>−</mo><mi>B</mi><mi>C</mi></mrow></semantics></math></inline-formula> performance was evaluated utilizing an in-house cycle simulation and analysis code (CSAC) that employs the heat exchanger design code as a subroutine. The results suggest that pressure drop in PCHEs with straight-channel configuration is up to 3.0 times larger than in PCHEs with zigzag-channel configuration. It was found that a higher pressure drop in the PCHEs with straight channels can be attributed to substantially longer channel lengths required for these designs (up to 4.1 times than zigzag-channels) based on the poor heat transfer characteristics associated with these channel geometries. Thus, cycle layouts using PCHEs with a straight-channel configuration impart a much higher load (up to 1.13 times) on the recompression compressor, this in turn, results in a lower pressure ratio across the turbine. Therefore, the overall performance of the <inline-formula><math display="inline"><semantics><mrow><mi>s</mi><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>−</mo><mi>B</mi><mi>C</mi></mrow></semantics></math></inline-formula> using PCHEs with straight-channel configurations is found to be substantially inferior to that of layouts using PCHEs with zigzag-channel configurations. Finally, optimization results suggest that heat exchanger’s design with inlet Reynolds number and heat exchanger effectiveness ranging from <inline-formula><math display="inline"><semantics><mrow><mn>32</mn><mrow><mo> </mo><mi mathvariant="normal">k</mi></mrow></mrow></semantics></math></inline-formula> to <inline-formula><math display="inline"><semantics><mrow><mn>42</mn><mrow><mo> </mo><mi mathvariant="normal">k</mi></mrow></mrow></semantics></math></inline-formula> and <inline-formula><math display="inline"><semantics><mrow><mn>0.94</mn><mo>></mo><mi>ϵ</mi><mo>></mo><mn>0.87</mn></mrow></semantics></math></inline-formula>, respectively, are optimal for <inline-formula><math display="inline"><semantics><mrow><mi>s</mi><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>−</mo><mi>B</mi><mi>C</mi></mrow></semantics></math></inline-formula> and present a good bargain between cycle efficiency and its layout size. |
| first_indexed | 2024-03-10T13:47:41Z |
| format | Article |
| id | doaj.art-9c69debf5e304ba39dbf2783d2dc536c |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T13:47:41Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-9c69debf5e304ba39dbf2783d2dc536c2023-11-21T02:27:42ZengMDPI AGEnergies1996-10732020-12-011416210.3390/en14010062Performance of Supercritical CO<sub>2</sub> Power Cycle and Its Turbomachinery with the Printed Circuit Heat Exchanger with Straight and Zigzag ChannelsMuhammed Saeed0Khaled Alawadi1Sung Chul Kim2Mechanical Engineering Department, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, UAEDepartment of Automotive and Marine Technology, The Public Authority of Applied Education and Trainings, Shuwaikh, Kuwait City 70654, KuwaitSchool of Mechanical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan-si 38541, KoreaSince printed circuit heat exchangers (PCHE) are the largest modules of a supercritical carbon dioxide Brayton cycle, they can considerably affect the whole system’s performance and layout. Straight-channel and zigzag-channel printed circuit heat exchangers have frequently been analyzed in the standalone mode and repeatedly proposed for <inline-formula><math display="inline"><semantics><mrow><mi>s</mi><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>−</mo><mi>B</mi><mi>C</mi></mrow></semantics></math></inline-formula>. However, the impact of heat exchanger designs with straight and zigzag-channel configurations on the performance of the cycle and its components, i.e., the turbine and compressor, has not been studied. In this context, this study evaluates the effect of different heat exchanger designs with various values of effectiveness (<inline-formula><math display="inline"><semantics><mi>ϵ</mi></semantics></math></inline-formula>), inlet Reynolds number (Re), and channel configuration (zigzag and straight channel) on the overall performance of the <inline-formula><math display="inline"><semantics><mrow><mi>s</mi><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>−</mo><mi>B</mi><mi>C</mi></mrow></semantics></math></inline-formula> and its components. For the design and analysis of PCHEs, an in-house PCHE design and analysis code (PCHE-DAC) was developed in the MATLAB environment. The <inline-formula><math display="inline"><semantics><mrow><mi>s</mi><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>−</mo><mi>B</mi><mi>C</mi></mrow></semantics></math></inline-formula> performance was evaluated utilizing an in-house cycle simulation and analysis code (CSAC) that employs the heat exchanger design code as a subroutine. The results suggest that pressure drop in PCHEs with straight-channel configuration is up to 3.0 times larger than in PCHEs with zigzag-channel configuration. It was found that a higher pressure drop in the PCHEs with straight channels can be attributed to substantially longer channel lengths required for these designs (up to 4.1 times than zigzag-channels) based on the poor heat transfer characteristics associated with these channel geometries. Thus, cycle layouts using PCHEs with a straight-channel configuration impart a much higher load (up to 1.13 times) on the recompression compressor, this in turn, results in a lower pressure ratio across the turbine. Therefore, the overall performance of the <inline-formula><math display="inline"><semantics><mrow><mi>s</mi><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>−</mo><mi>B</mi><mi>C</mi></mrow></semantics></math></inline-formula> using PCHEs with straight-channel configurations is found to be substantially inferior to that of layouts using PCHEs with zigzag-channel configurations. Finally, optimization results suggest that heat exchanger’s design with inlet Reynolds number and heat exchanger effectiveness ranging from <inline-formula><math display="inline"><semantics><mrow><mn>32</mn><mrow><mo> </mo><mi mathvariant="normal">k</mi></mrow></mrow></semantics></math></inline-formula> to <inline-formula><math display="inline"><semantics><mrow><mn>42</mn><mrow><mo> </mo><mi mathvariant="normal">k</mi></mrow></mrow></semantics></math></inline-formula> and <inline-formula><math display="inline"><semantics><mrow><mn>0.94</mn><mo>></mo><mi>ϵ</mi><mo>></mo><mn>0.87</mn></mrow></semantics></math></inline-formula>, respectively, are optimal for <inline-formula><math display="inline"><semantics><mrow><mi>s</mi><mi>C</mi><msub><mi>O</mi><mn>2</mn></msub><mo>−</mo><mi>B</mi><mi>C</mi></mrow></semantics></math></inline-formula> and present a good bargain between cycle efficiency and its layout size.https://www.mdpi.com/1996-1073/14/1/62supercritical carbon dioxide cycle simulationmulti-objective genetic algorithmheat exchanger optimization<i>sCO</i><sub>2</sub>-Brayton cycle |
| spellingShingle | Muhammed Saeed Khaled Alawadi Sung Chul Kim Performance of Supercritical CO<sub>2</sub> Power Cycle and Its Turbomachinery with the Printed Circuit Heat Exchanger with Straight and Zigzag Channels Energies supercritical carbon dioxide cycle simulation multi-objective genetic algorithm heat exchanger optimization <i>sCO</i><sub>2</sub>-Brayton cycle |
| title | Performance of Supercritical CO<sub>2</sub> Power Cycle and Its Turbomachinery with the Printed Circuit Heat Exchanger with Straight and Zigzag Channels |
| title_full | Performance of Supercritical CO<sub>2</sub> Power Cycle and Its Turbomachinery with the Printed Circuit Heat Exchanger with Straight and Zigzag Channels |
| title_fullStr | Performance of Supercritical CO<sub>2</sub> Power Cycle and Its Turbomachinery with the Printed Circuit Heat Exchanger with Straight and Zigzag Channels |
| title_full_unstemmed | Performance of Supercritical CO<sub>2</sub> Power Cycle and Its Turbomachinery with the Printed Circuit Heat Exchanger with Straight and Zigzag Channels |
| title_short | Performance of Supercritical CO<sub>2</sub> Power Cycle and Its Turbomachinery with the Printed Circuit Heat Exchanger with Straight and Zigzag Channels |
| title_sort | performance of supercritical co sub 2 sub power cycle and its turbomachinery with the printed circuit heat exchanger with straight and zigzag channels |
| topic | supercritical carbon dioxide cycle simulation multi-objective genetic algorithm heat exchanger optimization <i>sCO</i><sub>2</sub>-Brayton cycle |
| url | https://www.mdpi.com/1996-1073/14/1/62 |
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