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Experiment on CO2–based combined cooling and power cycle: A multi-mode operating investigation

Author

Listed:
  • Zhang, Yonghao
  • Shi, Lingfeng
  • Tian, Hua
  • Li, Ligeng
  • Wang, Xuan
  • Sun, Xiaocun
  • Shu, Gequn

Abstract

Combined cooling and power cycle is a high-profile way to improve energy utilization efficiency and mitigate energy issue. As a clean and environmentally friendly working fluid, CO2 has received growing attention in both power and refrigeration fields for its excellent properties and flexible application forms. Hence, CO2-based combined cooling and power cycle becomes a natural choice especially in scenarios with diversified energy desires. Despite many current theoretical explorations devoted to CO2-based combined cycle, experimental investigation is essential and obbligato to validate its flexibility in practical application. In this work, an experimental prototype of CO2-based combined cooling and power cycle is developed to fill the gaps in experimental aspect. The prototype system can realize three operating modes, namely power-alone mode, simultaneous cooling and power mode and cooling-alone mode, so as to accommodate diversified energy desires and heat source conditions. The dynamic characteristics of mode-switching process as well as the systematic performance between different modes are particularly investigated. The results reveal that a longer settling time is required for switching cooling-alone mode to simultaneous cooling and power mode, which is approximately 380 s. While the response speed is much faster when switching from power-alone mode to simultaneous cooling and power mode, with an average settling time of 159 s. Remarkably, switching the combined cycle from simultaneous cooling and power mode to power-alone mode or cooling-alone mode will either improve the power output or refrigeration output, concurrently ameliorating the effectiveness of heat transfer in the coupling condenser. The ultimate outputs of the combined cycle in the three modes are 5.8 kW power at power-alone mode, 3.2 kW power and 8.0 kW refrigeration at simultaneous cooling and power mode as well as 9.8 kW refrigeration at cooling-alone mode in the present tests.

Suggested Citation

  • Zhang, Yonghao & Shi, Lingfeng & Tian, Hua & Li, Ligeng & Wang, Xuan & Sun, Xiaocun & Shu, Gequn, 2022. "Experiment on CO2–based combined cooling and power cycle: A multi-mode operating investigation," Applied Energy, Elsevier, vol. 313(C).
    • Handle: RePEc:eee:appene:v:313:y:2022:i:c:s0306261922003129
    DOI: 10.1016/j.apenergy.2022.118884
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    References listed on IDEAS

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    1. Yu, Aofang & Xing, Lingli & Su, Wen & Liu, Pei, 2023. "State-of-the-art review on the CO2 combined power and cooling system: System configuration, modeling and performance," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).
    2. 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).
    3. He, Jintao & Shi, Lingfeng & Tian, Hua & Wang, Xuan & Zhang, Yonghao & Zhang, Meiyan & Yao, Yu & Cai, Jinwen & Shu, Gequn, 2022. "Control strategy for a CO2-based combined cooling and power generation system based on heat source and cold sink fluctuations," Energy, Elsevier, vol. 257(C).
    4. 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).

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