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设计一个冷藏库,其总跑冷量基本上是由两组热源的热流组成。一组是冷冻室本身的热流,如风扇、泵、照明灯、人等等。另一组则是来自外界的热流:经外墙传导而来的热、冷藏物存入时所带入的热以及偶尔新鲜空气供给的热。所有这些热流的计算在参考文献中已有说明(1、2、3),困难不大。但是,当冷藏库工作时,在第二组的热流中还要增加一个因素,即尤其是来自冷藏库周围的大量热:货物进出时免不了要开门而传入的热流。
Design a refrigerator, the total running cooling is basically composed of two groups of heat source heat. One group is the freezer itself heat, such as fans, pumps, lights, people and so on. Another group is the heat flow from the outside world: the heat conducted through the external walls, the heat brought in when the refrigerated goods are stored and the heat supplied by the occasional fresh air. The calculation of all these heat flows has already been described in the references (1, 2, 3), with little difficulty. However, when the refrigerator is working, a second factor is added to the heat flow in the second group, namely the large amount of heat coming in from around the freezer: the incoming and outgoing heat flow is inevitable when the goods enter or exit the premises.