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Proposal of multistage mass storage process to approach isothermal heat rejection of semi-closed S–CO2 cycle

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  • Sun, Enhui
  • Ji, Hongfu
  • Wang, Xiangren
  • Ma, Wenjing
  • Zhang, Lei
  • Xu, Jinliang

Abstract

For the semi-closed S–CO2 cycle (SC), multistage compression with intercooling is an effective method to reduce the average temperature at which heat is rejected. However, in a limited time, the direct cooling of the large flow of working fluid in the intercooler will cause significant irreversible loss and the number of intercooling stages is limited in practical application. Referring to the idea of compressed air energy storage (CAES), this paper proposes a multistage mass storage process which is superior to intercooling. The conventional intercooler is replaced by the storage tank, and the slow cooling and mixing cooling are achieved by storing the working fluid in the tank for a long time. Since a long time cooling can effectively reduce heat exchange loss, the mass storage process has the potential to construct the multistage mass storage, which gets rid of the restriction of the number of stages and makes the heat rejection process closer to isothermal. Furthermore, the multistage mass storage process is compared with intercooling and CAES, respectively, revealing the similarities and differences between each other, and proving the performance advantages of the multistage mass storage process. The results show that the efficiency of the SC with four-stage mass storage is 1.17% higher than that of the SC with single-compression, and the efficiency of the SC with one-stage mass storage is 0.15% higher than that of the SC with two-stage intercooling. The sensitivity analysis of the key parameters of the compression process will shed lights on further improvement of the system. The multistage mass storage process proposed in this paper can also be applied to other compression fields involving variable temperature heat rejection process.

Suggested Citation

  • Sun, Enhui & Ji, Hongfu & Wang, Xiangren & Ma, Wenjing & Zhang, Lei & Xu, Jinliang, 2023. "Proposal of multistage mass storage process to approach isothermal heat rejection of semi-closed S–CO2 cycle," Energy, Elsevier, vol. 270(C).
    • Handle: RePEc:eee:energy:v:270:y:2023:i:c:s0360544223002736
    DOI: 10.1016/j.energy.2023.126879
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