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Development and validation of a dynamic modeling framework for air-source heat pumps under cycling of frosting and reverse-cycle defrosting

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  • Ma, Jiacheng
  • Kim, Donghun
  • Braun, James E.
  • Horton, W. Travis

Abstract

Frost accumulation on evaporator coil surfaces can significantly degrade the performance of air-source heat pump (ASHP) systems in winter operations. The continued buildup of frost eventually necessitates a defrosting mode to remove the accumulated frost and return the system to its normal operating characteristics. A simulation tool capable of capturing the system dynamics with continuous mode-switching between heating and defrosting operation is extremely useful in the development and evaluation of improved control designs. However, first-principles simulation of a reverse-cycle defrost imposes a variety of numerical challenges including mode switching and flow reversal. This paper presents a comprehensive dynamic modeling framework that could overcome the challenges and experimental validations for ASHPs under cycling of frosting and defrosting operations. A complete first-principles ASHP cycle model is described where frost formation and melting models are integrated into a finite volume evaporator model to characterize the cycle behavior with non-uniform frost formation and melting. Comparisons of simulation results against experimental data collected from a residential heat pump unit indicate that the developed model is able to accurately capture the cycling behaviors of the ASHP system between heating and defrosting operations. In addition, no state event occurred during the simulation despite the presence of mode switching and flow reversal, strongly supporting the reliability of the proposed modeling approaches.

Suggested Citation

  • Ma, Jiacheng & Kim, Donghun & Braun, James E. & Horton, W. Travis, 2023. "Development and validation of a dynamic modeling framework for air-source heat pumps under cycling of frosting and reverse-cycle defrosting," Energy, Elsevier, vol. 272(C).
    • Handle: RePEc:eee:energy:v:272:y:2023:i:c:s0360544223004243
    DOI: 10.1016/j.energy.2023.127030
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    References listed on IDEAS

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    1. Han, Binglong & Xiong, Tong & Xu, Shijie & Liu, Guoqiang & Yan, Gang, 2022. "Parametric study of a room air conditioner during defrosting cycle based on a modified defrosting model," Energy, Elsevier, vol. 238(PA).
    2. Song, Mengjie & Deng, Shiming & Dang, Chaobin & Mao, Ning & Wang, Zhihua, 2018. "Review on improvement for air source heat pump units during frosting and defrosting," Applied Energy, Elsevier, vol. 211(C), pages 1150-1170.
    3. Qu, Minglu & Pan, Dongmei & Xia, Liang & Deng, Shiming & Jiang, Yiqiang, 2012. "A study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an air source heat pump – Part II: Modeling analysis," Applied Energy, Elsevier, vol. 91(1), pages 274-280.
    4. Qu, Minglu & Xia, Liang & Deng, Shiming & Jiang, Yiqiang, 2012. "A study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an air source heat pump – Part I: Experiments," Applied Energy, Elsevier, vol. 91(1), pages 122-129.
    5. Song, Mengjie & Xu, Xiangguo & Mao, Ning & Deng, Shiming & Xu, Yingjie, 2017. "Energy transfer procession in an air source heat pump unit during defrosting," Applied Energy, Elsevier, vol. 204(C), pages 679-689.
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    Cited by:

    1. Dhirendran Munith Kumar & Pietro Catrini & Antonio Piacentino & Maurizio Cirrincione, 2023. "Integrated Thermodynamic and Control Modeling of an Air-to-Water Heat Pump for Estimating Energy-Saving Potential and Flexibility in the Building Sector," Sustainability, MDPI, vol. 15(11), pages 1-23, May.

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