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建立了冷柜箱体保温层及箱内介质的数学模型，应用数值计算方法，计算了冷柜工作过程中保温层和箱内空气温度、开停机时间等参数；运用现值法推导聚氨酯泡沫塑料保温层厚度的经济性分析方法，并通过实例确定了一个冷柜的经济保温层厚度。
The mathematic model of the thermal insulating layer and the medium inside the freezer cabinet was established. The numerical calculation method was used to calculate the parameters such as the temperature of the thermal insulating layer and the air in the cabinet, and the opening and closing time of the freezer. The present value method was used to deduce the thermal insulation of the polyurethane foam Thickness economic analysis method, and through examples to determine a freezer insulation thickness.