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Experimental investigation on CO2-based zeotropic mixture composition-adjustable system

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  • Sun, Xiaocun
  • Shi, Lingfeng
  • Zhou, Shuo
  • Zhang, Yonghao
  • Yao, Yu
  • Tian, Hua
  • Shu, Gequn

Abstract

CO2 is a promising natural working fluid for its environment-friendly, property-stable and low-cost, and CO2-based zeotropic mixture could enhance the comprehensive performance of combined cooling and power cycle (CCP). Generally, CCP operates in a wide temperature range, and the fixed operating composition could not realize the optimal match for two sub-cycles. Zeotropic mixture composition adjustment could realize targeted thermal match of sub-cycles and further enhance the performance of CCP. However, systematic research on composition-adjustable CCP is limited in theoretical simulation, and there is still a lack of experimental evidence for the performance enhancement of composition adjustment on CCP. Besides, the feasibility of composition adjustment on CCP has not been fully verified through experimental method yet. In this study, an experimental prototype of CO2-based composition-adjustable CCP is established, the approach to realize composition adjustment is investigated, and the systematic test is carried out. Experimental results show that the introduction of composition adjustment is beneficial to the performance of CCP. Under the same boundary conditions and similar refrigeration conditions, composition-adjustable CCP could export 13.72 % more net power than composition-fixed CCP when the initial charged CO2 mass fraction equals 0.246, and the improvement is more apparent when the initial charged composition gets larger.

Suggested Citation

  • Sun, Xiaocun & Shi, Lingfeng & Zhou, Shuo & Zhang, Yonghao & Yao, Yu & Tian, Hua & Shu, Gequn, 2024. "Experimental investigation on CO2-based zeotropic mixture composition-adjustable system," Energy, Elsevier, vol. 300(C).
    • Handle: RePEc:eee:energy:v:300:y:2024:i:c:s0360544224012283
    DOI: 10.1016/j.energy.2024.131455
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    References listed on IDEAS

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