Volume 25 Issue 1
Feb.  2025
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LIU Chang-xin, SHI Fei-xiong, WANG Feng, LI Yi-ran, QIAO Guang-chao, SUN De-ping, LI Hua-an. Performance simulation and optimization of ship waste heat TEG-ORC combined cycle based on R1234ze and its mixed working fluids[J]. Journal of Traffic and Transportation Engineering, 2025, 25(1): 160-171. doi: 10.19818/j.cnki.1671-1637.2025.01.011
Citation: LIU Chang-xin, SHI Fei-xiong, WANG Feng, LI Yi-ran, QIAO Guang-chao, SUN De-ping, LI Hua-an. Performance simulation and optimization of ship waste heat TEG-ORC combined cycle based on R1234ze and its mixed working fluids[J]. Journal of Traffic and Transportation Engineering, 2025, 25(1): 160-171. doi: 10.19818/j.cnki.1671-1637.2025.01.011
shu

Performance simulation and optimization of ship waste heat TEG-ORC combined cycle based on R1234ze and its mixed working fluids

doi: 10.19818/j.cnki.1671-1637.2025.01.011
  • 1.

    College of Marine Engineering, Dalian Maritime University, Dalian 116026, Liaoning, China

  • 2.

    Angang Dellin Logistics Port Supply Chain Service Co., Ltd., Anshan 114000, Liaoning, China

Funds:

National Key R&D Program of China 2021YFA1201604

More Information
  • Corresponding author: LIU Chang-xin(1981-), male, associate professor, PhD, liu_changxin@dlmu.edu.cn
  • Received Date: 2023-06-18
  • Publish Date: 2025-02-25
    Abstract
  • To improve the energy efficiency of ships during navigation, the ship waste heat was taken as the research object, and the problem of working fluid selection in the ship waste heat recovery system based on the combined thermoelectric generation-organic Rankine cycle (TEG-ORC) was studied. The thermodynamic and economic models of the TEG-ORC combined cycle system were constructed. The performance parameters of the combined cycle system were studied by using R1234ze single working fluid and R245fa/R1234ze mixed working fluid respectively. The system output power, thermal efficiency, and power-production cost were taken as evaluation indicators, and the output performances of the system with different mixing ratios were compared. By taking the highest system output power and the lowest power-production cost as indicators for optimization analysis, the optimal configuration of the combined cycle system with the mixed working fluid was determined. Analysis results show that when R1234ze single working fluid is used, the maximum output power of the combined cycle system is 1 836 W, the minimum power-production cost is 0.493 yuan·(kW·h)-1, and the maximum thermal efficiency is 17.09%. As the proportion of R245fa component in the mixed working fluid increases continuously, compared with the R1234ze single working fluid, the system output power increases by up to 12%. Compared with the R245fa single working fluid, the power-production cost of the system decreases by up to 54%, and the corresponding output power increases by 10%. The optimal mixing ratio of R245fa/R1234ze is determined to be 0.9. At this time, the maximum system output power is 2 076 W, and the minimum power-production cost is 0.231 yuan·(kW·h)-1, the maximum thermal efficiency is 34.5%. Compared with using the R1234ze single working fluid, the system with the mixed working fluid has a 13% increase in the maximum output power, a 102% increase in the maximum thermal efficiency, and a 53% reduction in the minimum power-production cost. When the system uses the working fluid with the optimal mixing ratio, the best system output power is determined to be 2 076 W. At this time, the number of TEG modules is 33, and the working fluid flow rate is 0.06 kg·s-1, the evaporation pressure is 1 000 kPa. It can be seen that using the mixed working fluid further improves the output performance of the combined cycle system and the matching of the cold and heat sources.

     

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