IIR document

Frost formation on a cooling coil in supersaturated supply air.

Author(s) : NGONDA T. N., SHEER T. J.


This paper proposes a model for pressure drop and heat transfer of cold-room cooling coils with supersaturated supply air. The model predicts the frost formation and the resulting increase in pressure drop and reduction in heat transfer for a coil. The model has two aspects, the heat exchanger model and the frost model. The heat exchanger is modelled based on distributed parameter principles. The frost is modelled based on layer-averaged energy and mass conservation equations for the frost layer. The airflow is considered as two-phase particle-laden flow, with saturated air as the carrier gas and the suspended ice crystals as the dispersed particles. The paper includes a comparison of results from model simulations with experimental results generated with a flat-finned coil. Reasonable agreement was obtained between the numerical and experimental results, particularly for low temperatures (below -12°C).

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Pages: ICR07-B2-151


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  • Original title: Frost formation on a cooling coil in supersaturated supply air.
  • Record ID : 2008-0223
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21


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