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A hybrid H2O/IL absorption and CO2 compression air-source heat pump for ultra-low ambient temperatures

Author

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  • Wu, Wei
  • Zhai, Chong
  • Huang, Si-Min
  • Sui, Yunren
  • Sui, Zengguang
  • Ding, Zhixiong

Abstract

Heat pumps are promising for carbon neutrality. However, the existing vapor-compression heat pumps suffer from severe performance deterioration while the absorption heat pumps rely on toxic NH3-based fluids in sub-zero conditions. Therefore, a novel hybrid H2O/ionic liquid absorption and CO2 compression air-source heat pump is proposed for ultra-low ambient temperatures. The verified property and cycle models are used for performance optimization, characterization, and comparison. The coupling temperature that oppositely affects the efficiencies of the two sub-cycles is optimized to be 6 °C. With the ambient temperature rising from −30 °C to 0 °C, the primary energy efficiency (PEE) increases from 1.064 to 1.256, higher by 18–40% compared to a gas boiler. The heating capacity stably ranges in 94.0–102.9 kW, significantly increasing the reliability in cold climate. As the driving temperature rises from 96 °C to 130 °C, the PEE slightly varies in 1.155–1.190, while the exergetic coefficient of performance decreases from 0.609 to 0.600, encouraging the use of low-temperature heat sources (e.g., 100 °C). Compared to existing heat pumps, the hybrid heat pump efficiently operates at −30 °C, showing the highest PEE for most sub-zero conditions with much slower heating capacity deterioration. The advantage is much higher under colder conditions.

Suggested Citation

  • Wu, Wei & Zhai, Chong & Huang, Si-Min & Sui, Yunren & Sui, Zengguang & Ding, Zhixiong, 2022. "A hybrid H2O/IL absorption and CO2 compression air-source heat pump for ultra-low ambient temperatures," Energy, Elsevier, vol. 239(PB).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pb:s0360544221024282
    DOI: 10.1016/j.energy.2021.122180
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    References listed on IDEAS

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    Cited by:

    1. Sui, Yunren & Wu, Wei, 2023. "Ionic liquid screening and performance optimization of transcritical carbon dioxide absorption heat pump enhanced by expander," Energy, Elsevier, vol. 263(PA).
    2. Ji, Qiang & Wang, Yikai & Yin, Yonggao & Wang, Mu & Che, Chunwen & Cao, Bowen & Chen, Wanhe, 2023. "Cooling performance of compression-absorption cascade system with novel ternary ionic-liquid working pair," Energy, Elsevier, vol. 278(PB).
    3. You, Tian & Wang, Fang, 2023. "Green ground source heat pump using various low-global-warming-potential refrigerants: Thermal imbalance and long-term performance," Renewable Energy, Elsevier, vol. 210(C), pages 159-173.
    4. Ding, Zhixiong & Wu, Wei & Huang, Si-Min & Huang, Hongyu & Bai, Yu & He, Zhaohong, 2023. "A novel compression-assisted energy storage heat transformer for low-grade renewable energy utilization," Energy, Elsevier, vol. 263(PA).

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