Hits:

Indexed by:期刊论文

Date of Publication:2011-02-01

Journal:INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW

Included Journals:SCIE、EI

Volume:32

Issue:1

Page Number:249-260

ISSN No.:0142-727X

Key Words:Fin-and-tube heat exchanger; Frost formation and growth; Nucleation theory; CFD; Numerical simulation

Abstract:Accurate prediction of frost characteristics has crucial influence on designing effective heat exchangers. In this paper, a new CFD (Computational Fluid Dynamics) model has been proposed to predict the frost behaviour. The initial period of frost formation can be predicted and the influence of surface structure can be considered. The numerical simulations have been carried out to investigate the performance of fin-and-tube heat exchanger under frost condition. The results have been validated by comparison of simulations with the data computed by empirical formulas. The transient local frost formation has been obtained. The average frost thickness, heat exchanger coefficient and pressure drop on air side has been analysed as well. In addition, the influence factors have also been discussed, such as fin pitch, relative humidity, air flow rate and evaporating temperature of refrigerant. (C) 2010 Elsevier Inc. All rights reserved.