Temperature Adaptability Analysis of Closed Cycle Using CO<sub>2</sub>-Based Mixed Working Fluid for Underwater Platforms

FENG Jiaqi; WANG Junpeng; CHEN Zhentao; LUO Zhengyuan; BAI Bofeng

doi:10.11993/j.issn.2096-3920.2024-0051

Volume 32 Issue 6

Jan 2025

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Article Navigation > Journal of Unmanned Undersea Systems > 2024 > 32(6): 1053-1062

FENG Jiaqi, WANG Junpeng, CHEN Zhentao, LUO Zhengyuan, BAI Bofeng. Temperature Adaptability Analysis of Closed Cycle Using CO2-Based Mixed Working Fluid for Underwater Platforms[J]. Journal of Unmanned Undersea Systems, 2024, 32(6): 1053-1062. doi: 10.11993/j.issn.2096-3920.2024-0051

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FENG Jiaqi, WANG Junpeng, CHEN Zhentao, LUO Zhengyuan, BAI Bofeng. Temperature Adaptability Analysis of Closed Cycle Using CO₂-Based Mixed Working Fluid for Underwater Platforms[J]. Journal of Unmanned Undersea Systems, 2024, 32(6): 1053-1062. doi: 10.11993/j.issn.2096-3920.2024-0051

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Temperature Adaptability Analysis of Closed Cycle Using CO₂-Based Mixed Working Fluid for Underwater Platforms

doi: 10.11993/j.issn.2096-3920.2024-0051

State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Received Date: 2024-03-14
Accepted Date: 2024-05-13
Rev Recd Date: 2024-04-18

Available Online: 2024-11-08

Abstract

Abstract

The supercritical CO₂ Brayton cycle system is an important development direction of underwater platform power technology. However, due to the low temperature in the deep sea which is far away from the critical temperature of CO₂, the cycle system has temperature adaptability problems. This paper proposed the plan to use CO₂-based mixed working fluid to improve cycle temperature adaptability and further optimize cycle performance. A simple recuperative closed cycle thermodynamic model was established, and the changes in critical parameters of CO₂-based mixed working fluid with the type and mass fraction of added gas were analyzed. The influence of the compressor inlet state parameters on the thermodynamic properties of the closed cycle of CO₂-based mixed working fluid was clarified. Besides, the influence of the pseudo-critical point position of the mixed working fluid on the pinch point and thermal inertia of the regenerator was discussed. The results show that the mixed working fluid cycle with low critical parameters can further expand the cycle temperature range and pressure ratio to improve the cycle thermodynamic performance. However, only expanding the temperature range and reducing the pressure ratio may have an adverse impact on it. Comprehensive consideration of cycle thermal efficiency, specific power, and pinch point and thermal inertia of regenerator, the maximum thermal efficiency of CO₂ + Xe(CO₂/Xe: 0.5/0.5)- transcritical Rankine cycle, CO₂ + SF₆(CO₂/SF₆: 0.9/0.1)-transcritical liquid Brayton cycle, CO₂ + SF₆(CO₂/SF₆: 0.5/0.5)-transcritical Rankine cycle can be increased by 3.79% than that of the supercritical CO₂ Breton cycle, and the maximum specific power can be increased by 31.6%. The pinch point of the regenerator is located at the cold end, which does not increase its thermal inertia and does not slow down the system response speed.
- underwater platform,
- CO₂-based mixed working fluid,
- closed cycle,
- temperature adaptability

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References

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Temperature Adaptability Analysis of Closed Cycle Using CO₂-Based Mixed Working Fluid for Underwater Platforms

doi: 10.11993/j.issn.2096-3920.2024-0051

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Temperature Adaptability Analysis of Closed Cycle Using CO2-Based Mixed Working Fluid for Underwater Platforms

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Temperature Adaptability Analysis of Closed Cycle Using CO₂-Based Mixed Working Fluid for Underwater Platforms