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Effect of drying air supply temperature and internal heat exchanger on performance of a novel closed-loop transcritical CO2 air source heat pump drying system

Author

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  • Hou, Yaxiang
  • Wu, Weidong
  • Li, Zhenbo
  • Yu, Xinyi
  • Zeng, Tao

Abstract

A novel closed-loop transcritical CO2 air-source heat pump drying (HPD) system with a relatively simple structure, higher drying temperature, and internal heat exchanger (IHX) for the drying of medical equipment was proposed and built. With or without the IHX in the system, the effects of different drying air supply temperatures on the performance of transcritical CO2 HPD system were studied experimentally. The results showed that the maximum drying air supply temperature (DAST) in the designed system could reach 72.9 °C. As the DAST raised, whether with or without the IHX in the system, the coefficient of heating performance (COPh), coefficient of system performance (COPsys), and specific moisture extraction rate (SMER) decreased gradually and moisture extraction rate (MER) increased continuously. When the DAST was 70 °C, COPh, COPsys, MER and SMER were respectively 3.68, 6.07, 3.27 kg/h and 1.68 kg/(kW·h) in the HPD system without the IHX, and were respectively 4.00, 6.89, 3.67 kg/h and 1.97 kg/(kW·h) in the HPD system with the IHX. In contrast, the compressor discharge pressure decreased 4.26 %–5.99 %, COPh increased 1.39 %–8.65 %, COPsys increased 1.89 %–13.57 %, MER increased 4.68 %–14.01 %, SMER increased 6.93 %–17.18 % in the HPD system with the IHX.

Suggested Citation

  • Hou, Yaxiang & Wu, Weidong & Li, Zhenbo & Yu, Xinyi & Zeng, Tao, 2023. "Effect of drying air supply temperature and internal heat exchanger on performance of a novel closed-loop transcritical CO2 air source heat pump drying system," Renewable Energy, Elsevier, vol. 219(P2).
    • Handle: RePEc:eee:renene:v:219:y:2023:i:p2:s0960148123014313
    DOI: 10.1016/j.renene.2023.119516
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    References listed on IDEAS

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    1. Qin, Xiang & Wang, Dingbiao & Jin, Zunlong & Wang, Junlei & Zhang, Guojie & Li, Hang, 2021. "A comprehensive investigation on the effect of internal heat exchanger based on a novel evaluation method in the transcritical CO2 heat pump system," Renewable Energy, Elsevier, vol. 178(C), pages 574-586.
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    4. Agyenim, Francis, 2016. "The use of enhanced heat transfer phase change materials (PCM) to improve the coefficient of performance (COP) of solar powered LiBr/H2O absorption cooling systems," Renewable Energy, Elsevier, vol. 87(P1), pages 229-239.
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    1. Zendehboudi, Alireza, 2024. "Optimal discharge pressure and performance characteristics of a transcritical CO2 heat pump system with a tri-partite gas cooler for combined space and water heating," Renewable Energy, Elsevier, vol. 226(C).
    2. Wang, Haitao & Li, Siqi & Lei, Keke & Zhang, Jianjun, 2025. "Performance analysis of cross seasonal thermal storage solar soil source heat pump drying system," Renewable Energy, Elsevier, vol. 241(C).
    3. Yang, Lingxiao & Wang, Xin & Xu, Bo & Chen, Zhenqian, 2024. "Characteristic analysis and performance optimization of a transcritical CO2 heat pump for high-temperature heating: An experimental study," Renewable Energy, Elsevier, vol. 237(PB).
    4. Yu, Mengqi & Zou, Lingeng & Yu, Jianlin, 2024. "Experimental study on effects of compressor speed on a heat pump dryer system with auxiliary solar source," Renewable Energy, Elsevier, vol. 228(C).

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