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A field study on the characteristics of cold and wet island effect of air source heat pump array and its impacts on heating performance.

Author(s) : LIANG S., GAO X., BAI X., WANG G., WANG Z., YAN Y., WANG H.

Type of article: IJR article

Summary

The Wet Island Effect (WIE) usually occurred with the Cold Island Effect (CIE) in the Air Source Heat Pump Array (ASHP-A) in heating seasons. However, the WIE phenomenon of ASHP-A has long been neglected in existing studies. As a result, the evaluation method for WIE characteristics and its impacts remained undeveloped. Therefore, to effectively alleviate the CIE and WIE (C-WIE) phenomena, the characteristics of C-WIE phenomena were carried out first, then a novel evaluation index, the output heating capacity loss coefficient, was developed to evaluate the impacts of the CIE and WIE on the heating performance loss of ASHP-A via 4 field Cases. The results suggested that for the Air Source Heat Pump (ASHP) units located in the central area, the C-WIE phenomena were more severe than those in the edge; the former had a higher air saturation level and a lower air temperature for the inlet air of the outdoor coil. Due to the impacts of C-WIE, the averaged intensity of CIE and WIE reached 5.5 ◦C and 1.1 ◦C, respectively. The daily averaged defrosting frequency increased by 100 %. Correspondingly, the averaged output heating capacity loss coefficient caused by CIE and WIE was 0.18 and 0.13,
respectively. The daily averaged output heating capacity and COP decreased by up to 31.7 % and 34.8 %, respectively. The research results could guide the development of spatial layout design methods and optimal dynamic control strategies of ASHP-A operation, for alleviating the negative impacts of C-WIE on ASHP-A. 

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Details

  • Original title: A field study on the characteristics of cold and wet island effect of air source heat pump array and its impacts on heating performance.
  • Record ID : 30034345
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 179
  • Publication date: 2025/11
  • DOI: http://dx.doi.org/https://doi.org/10.1016/j.ijrefrig.2025.08.030

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