In present developed world cooling and freezing appliances are present in almost every household. In order to optimize the combined refrigerated and freezing appliance a numerical model for transient heat transfer through it's walls has been made. In the numerical model, known correlations for describing the natural convection have been included which yielded to determined heat transfer coefficient between the air and all of the walls of the appliance. Several measurements have been preformed which confirmed the suitability of the numerical model. Parametric analysis gave us the best ratio between the insulation costs and electrical energy consumption of the combined refrigerated and freezing appliance.
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