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Modeling and operational characteristics analysis of a dual-source synergetic heat pump based on air energy and biomass waste heat

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Listed:
  • Yu, Qiang
  • Yang, Ziliang
  • Song, Jidong
  • Xing, Fuhao
  • Zhou, Jianhui
  • Qi, Haijie

Abstract

Air source heat pumps have gradually become a widely used heating solution worldwide due to their advantages of high efficiency, energy conservation, and environmental protection. However, air source heat pumps also face some challenges in practical applications, such as unstable heating and performance degradation in low-temperature environments. In order to improve these problems, based on the cascade heat technology, a new type of dual-source synergetic heat pump system is designed using air energy and biomass waste heat dual heat sources. In order to study its performance, a simulation model of the heat pump system was first constructed using distributed-parameter method. In order to verify the effectiveness of the model, an 18-kW heat pump experimental unit was constructed. By comparing the three key parameters of user side outlet water temperature, high-temperature compressor power, and system coefficient of performance (COP), the results show that the maximum error does not exceed 11 %; Secondly, in order to improve the stability and operational efficiency of the system, a three-level control strategy was designed based on considering the coordination of different grade heat sources; Finally, based on the above, the operating characteristics of the heat pump system were investigated through testing under different external input conditions. The research results indicate that by utilizing cascade heating and parallel heat exchange technology, the heat pump system can achieve stable heating even under large fluctuations in external working conditions. At the same time, compared with air source heat pumps, the COP can be improved by 69.7 % in low-temperature environments. The system results not only provide reference for the design and operation of new heat pump systems, but also provide practical and feasible solutions for the problem of decreased heat pump performance in low-temperature environments.

Suggested Citation

  • Yu, Qiang & Yang, Ziliang & Song, Jidong & Xing, Fuhao & Zhou, Jianhui & Qi, Haijie, 2024. "Modeling and operational characteristics analysis of a dual-source synergetic heat pump based on air energy and biomass waste heat," Energy, Elsevier, vol. 309(C).
    • Handle: RePEc:eee:energy:v:309:y:2024:i:c:s0360544224028627
    DOI: 10.1016/j.energy.2024.133087
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    References listed on IDEAS

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