Transient two-dimensional model of frost formation on a fin-and-tube heat exchanger

Lenić, Kristian; Trp, Anica; Franković, Bernard

doi:10.1016/j.ijheatmasstransfer.2008.06.005

Cited by 64 publications

(21 citation statements)

References 14 publications

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“…Lenic et al [1] showed that frost formation on a fin-tube appreciably impresses forced convection heat transfer from air to the refrigerant in the heat exchangers. They concluded that when the inlet air humidity and temperature are high the frost layer growth is faster.…”

Section: Heat Transfer-asian Research 41 (1) 2012mentioning

confidence: 99%

Experimental study of natural frost formation over a horizontal tube with annular compact fins under natural convection

Mahdavi

Yaghoubi

2011

Heat Trans. Asian Res.

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This paper presents experimental measurements of natural convection heat transfer and frost deposition over a horizontal fin-tube. Measurements are made for a fin-tube of diameter 25.4 mm, fin thickness 0.4 mm, fin center diameter 56 mm, and fin spacing 2 mm. For measurements the ambient air temperature and relative humidity are changed from 18 to 25°C and from 35% to 55%, respectively. The tube surface temperature is changed from -5 to -9 °C, and super cooling degrees of 7.5 to 24.5 °C.Results include a visualization of frost deposition growth, frost accumulation rate, and heat transfer rate with respect to time for each experiment. The results show that cold air starts from the upper point and moves downward and frost deposition starts on the fin tips, and grows with time both radially and angularly. Frost growth thickness changes significantly from top to bottom, where the boundary layers of both thermal and concentration increase at the bottom of the fin-tube section without considerable separation. Frost growth only takes place on the fin's tip and it blocks the heat and mass transfer from the fin surfaces and the tube base which reduces convection and frost growth considerably.

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Section: Heat Transfer-asian Research 41 (1) 2012mentioning

confidence: 99%

Experimental study of natural frost formation over a horizontal tube with annular compact fins under natural convection

Mahdavi

Yaghoubi

2011

Heat Trans. Asian Res.

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“…Kim [7] presented a numerical model for predicting frost behaviour on a heat exchanger fin under frosting conditions, taking into account fin heat conduction and three-dimensional air flow. Lenic [8] proposed a transient two-dimensional model of frost formation that includes air and frost subdomains as well as a boundary condition on the air-frost interface. A subsequent study determined the optimal duration of the cooling cycle and the optimal starting point for the defrost process [8].…”

Section: Introductionmentioning

confidence: 99%

“…Lenic [8] proposed a transient two-dimensional model of frost formation that includes air and frost subdomains as well as a boundary condition on the air-frost interface. A subsequent study determined the optimal duration of the cooling cycle and the optimal starting point for the defrost process [8].…”

Section: Introductionmentioning

confidence: 99%

Modelling the defrost process in complex geometries – part 2: wall-function based coupling to a multi-region CFD solver

et al. 2017

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Abstract. Presence of frost in air coolers reduces the performance and thus has to be removed frequently. A method commonly applied for frost removal is hot-gas defrosting. For the efficient design of this periodically performed operating sequence, a precise prediction of the process is essential. A CFD simulation is a capable tool for this evaluation. This paper presents an integration of a defrost model into a CFD solver of the software OpenFOAM. The multi-region properties implemented in the existing code are adapted for the metal fin and tube structure and the air flow channel. The extension of the solver for evaluating the frost layer is accomplished by an interfacial wall function which models the frost characteristics and performs the thermal coupling. The extended solver is tested in a simplified environment, focusing on a fin-tube section. The simulated course of the defrost process and the total defrost time are discussed.

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“…Kwan et al [5] did experiment on the flat plate and developed an algorithm for analysis of results. Marandi et al [6] and Lenic and Frankovic [7] proposed numerical approach for prediction of frost formation and for validating of the results; experiments over flat plate were performed. Furthermore, Lee et al [8] and Tao and Besant [9] suggested one-dimensional model for prediction of frost characteristics and validated the experimental data over flat plate.…”

Section: Introductionmentioning

confidence: 99%

Correlation for frost properties on a cold cylinder surface in cross flow

et al. 2012

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An experimental study was reported earlier on the development of frost formation by humid flow passing over the cylinder. In this study, dimensionless correlations based on previous experimental data and reported empirical correlations of others for frost properties are proposed. The frost conduction coefficient is determined by using an analytical equation. Subsequently, correlations are sought for the heat conduction coefficient, dimensionless temperature, dimensionless thickness and density. The advantages of these correlations to any other proposed correlations are their explicit and dependency on time. Furthermore, an estimation of characteristics of the frost is followed by using the same approach and the established correlations.

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Transient two-dimensional model of frost formation on a fin-and-tube heat exchanger

Cited by 64 publications

References 14 publications

Experimental study of natural frost formation over a horizontal tube with annular compact fins under natural convection

Experimental study of natural frost formation over a horizontal tube with annular compact fins under natural convection

Modelling the defrost process in complex geometries – part 2: wall-function based coupling to a multi-region CFD solver

Correlation for frost properties on a cold cylinder surface in cross flow

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