Abstract:

A model for the heat transfer of  vacuum insulation panel（VIP）and polyurethane foam（PU）multiple-insulator applied to freezer is established and the relationship between the heat flux and thickness of VIP under different total thickness of the multiple-insulator is analyzed.Five curves of heat flux versus thickness of VIP corresponding to five kinds of total thickness of multiple-insulator are presented through simulation.The energy-saving effect and economic benefits from the VIP+PU multiple-insulator applying to freezer are further analyzed and then the optimal thicknesses of VIP in multiple-insulator and its corresponding invest recall-period under different total thicknesses are obtained.It is revealed that all the optimal thicknesses of VIP nearly have the same value of 0.01 m.The shortest invest recall period for the application of the multiple-insulator instead of pure PU insulator to freezer is 3.7 years.

摘要：

建立了低温冷柜VIP（真空绝热板）和PU（聚氨酯硬质泡沫塑料）复合隔热体热流量的数学模型，以反映低温冷柜复合隔热体在给定总厚度后热流量随VIP板厚度的变化关系；并得出了5种给定总厚度下的热量随VIP厚度的关系曲线。分析了低温冷柜中使用VIP板部分替代PU硬质泡沫塑料所产生的节能效应及经济效益，得出了5种总厚度下真空隔热板的最佳替代厚度和回收年限。研究结果表明：综合考虑传热特性和经济性，在总厚度为0.04～0.08 m的复合体中，真空板VIP的最佳厚度为0.01 m，其对应的最短回收年限为