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Volume 29 Issue 6
 
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Article Navigation >  Journal of Unmanned Undersea Systems  > 2021  >  29(6): 648-658
QIN Kan, ZHANG Jia-nan, LUO Kai, DANG Jian-jun. Investigation of Organic Rankine Cycle for Underwater Power System[J]. Journal of Unmanned Undersea Systems, 2021, 29(6): 648-658. doi: 10.11993/j.issn.2096-3920.2021.06.002
Citation: QIN Kan, ZHANG Jia-nan, LUO Kai, DANG Jian-jun. Investigation of Organic Rankine Cycle for Underwater Power System[J]. Journal of Unmanned Undersea Systems, 2021, 29(6): 648-658. doi: 10.11993/j.issn.2096-3920.2021.06.002
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Investigation of Organic Rankine Cycle for Underwater Power System

doi: 10.11993/j.issn.2096-3920.2021.06.002

  • School of Marine Science and Technology, Northwestern Polytechnical University, Xian 710072, China

  • Received Date: 2021-09-10
  • Rev Recd Date: 2021-10-24
  • Publish Date: 2021-12-31
    Abstract
  • The closed steam Rankine cycle is typically employed as a power system for unmanned undersea vehicles, but with low system efficiency. In this paper, a closed-organic Rankine cycle is proposed as an alternative, where the required output power is on the order of 10 kW. The working conditions and associated sizing constraints for a power cycle operating in underwater environments are detailed. The small-scale axial turbine is specifically designed for different operating conditions and incorporated into the thermodynamic model of the system. Using the established thermodynamic model for turbine and heat exchangers, various organic fluids are scrutinized to maximize system efficiency and to ensure the sizing constraint encountered in an underwater environment. Numerical results show that the high-temperature dry fluid with trans-critical cycles can significantly enhance the system efficiency. System efficiencies of 24.38% and 22.29% are obtained using cyclohexane and toluene, respectively, while the sizing constraints are also satisfied. This corresponds to an increase of 6.77%~8.86% in terms of system efficiency compared to conventional steam Rankine cycles. This work provides insights into the potential applications of the organic Rankine cycle for undersea vehicles

     

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