Abstract
The paper presents a new defrosting method in which a frost layer is melted away by radiative heat as a heat source. The optical characteristics of the horizontal frost layer (reflectivity, transmissivity, absorptivity) are obtained under various frost melting conditions. The far-infrared lamp having a maximum wavelength of 5.5μm is selected as the optimum radiative heat source for the melting frost. The frost layer melting experiments with radiative heat are carried out under various exvironmental parameters (radiative heat flux, environmental air temperature, air humidity, cooling brine temperature) and frost structural factors of density and porosity. The useful dimensionless equations for predicting the time taken for complete frost melting are derived as a function of various frost melting parameters.
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