"A New Dynamic Heat Exchanger Model with Frosting and Defrosting" by Hongtao Qiao, Vikrant Aute et al.
 

Key

2249

Conference Year

2014

Keywords

Dynamic, Modeling, Heat exchanger model, Frosting, Defrosting

Abstract

In this paper, a dynamic heat exchanger model that unifies the frosting and defrosting analyses is presented. A novel scheme is proposed to solve the air flow redistribution due to non-uniform frost blockage. Unlike the existing defrost models which separate analysis for tubes and fins, the proposed defrost model unifies the analysis to maintain model consistency. The first-principles based frost and defrost models developed in this research allow for a more realistic assessment of the heat pump systems and greatly facilitate the design of controls. Utilizing the developed models, the transient behavior of a flash tank vapor injection heat pump under frosting and defrosting conditions is investigated and validated against experimental data.

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