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Analysis of an ideal composition tunable combined cooling and power cycle with CO2-based mixture

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  • Sun, Xiaocun
  • Shi, Lingfeng
  • Tian, Hua
  • Wang, Xuan
  • Zhang, Yonghao
  • Yao, Yu
  • Sun, Rui
  • Shu, Gequn

Abstract

Thermodynamic cycle can realize maximum efficiency when temperature profiles of working fluid and heat source/sink match exactly, such as Carnot cycle and Lorenz cycle. Ascribed to the discrepancy of real working fluid and ideal working fluid, generally, the best temperature match of different heat exchange processes cannot be obtained meantime. To surmount this issue and give full play to zeotropic mixtures’ advantage, transformation of combined cooling and power cycle after introducing composition adjustment is discussed in this study. The phenomenon of temperature mismatch happened in a composition-fixed combined cycle is investigated first, it shows that optimal mixture compositions among various heat exchange processes are disparate. Then, an ideal composition tunable combined cycle is evaluated without considering the specific adjustment process; results show that, under the same cooling requirement, net power output of the combined cycle could be improved by 3.93% owing to the adjustment of composition operated in sub-cycles and enhanced temperature match. To realize the required composition obtained during ideal analysis, a two-step composition adjustment method is proposed and the desired composition could be acquired by suitable separation quality and rebuilding proportion. However, due to the restraint of pinch point, the practical composition tuning structure could realize 2.30% improvement.

Suggested Citation

  • Sun, Xiaocun & Shi, Lingfeng & Tian, Hua & Wang, Xuan & Zhang, Yonghao & Yao, Yu & Sun, Rui & Shu, Gequn, 2022. "Analysis of an ideal composition tunable combined cooling and power cycle with CO2-based mixture," Energy, Elsevier, vol. 255(C).
    • Handle: RePEc:eee:energy:v:255:y:2022:i:c:s0360544222013640
    DOI: 10.1016/j.energy.2022.124461
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    1. Sun, Xiaocun & Shi, Lingfeng & Tian, Hua & Wang, Xuan & Zhang, Yonghao & Yao, Yu & Lu, Bowen & Sun, Rui & Shu, Gequn, 2023. "Performance enhancement of combined cooling and power cycle through composition adjustment in off-design conditions," Energy, Elsevier, vol. 278(PA).
    2. Zhao, Dongpeng & Han, Changho & Cho, Wonhee & Zhao, Li & Kim, Yongchan, 2022. "Directly combining a power cycle and refrigeration cycle: Method and case study," Energy, Elsevier, vol. 259(C).

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