浅析电冰箱制冷循环与节能

Analyzing on Refrigeration Cycle and Saving Energy of Refrigerator

对比了电冰箱单路、双路、多路循环及双机、双级制冷循环,分析了其能耗状况,进行了成本、系统匹配性、市场占有率及其cop值比较。针对双路循环存在的濒繁开停机现象,提出了完善控制方式及采用双稳态电磁阀的变温技术。变温室蒸发器与冷冻室蒸发器串联,其前串联双稳态电磁阀2,并在变温室蒸发器上并联双稳态电磁阀1,据变温室温度设定改变双稳态电磁阀通断实现两个循环支路交替制冷。冷藏室温度控制压缩机启停,变温室温度仅控制双稳态电磁阀通断,实现切换制冷剂流向目的。应用该循环方式及相关措施研制的BCD-186CHS直冷电冰箱最大负荷日耗电0.39度,在变温情况下耗电在0.35度以下,最低达0.31度。

The refrigeration cycles of single path, double path, multi-path and the two-compressor and double-stage compressor were compared. Analysis on cost, matching property, prospect of market and Coefficient of Performance(COP) was completed. To solve the problem of frequent compressor's on-off on double path refrigeration, the methods were presented including improving the control way and using the variable temperature technology of electro-magnetic valve with double steady state. The evaporator in the variable temperature area contacted the evaporator in freezing chamber and the electro-magnetic valve Ⅱ with double steady state while the electro-magnetic valve Ⅰwas in parallel connection with the evaporator in the variable temperature area. By designing the temperature of the variable temperature area the electro-magnetic valve with double steady state was on or off so that the two cycle operated alternately. The temperature of cold storage chamber controled the opening and shutting of the compressor and the temperature of the variable temperature chamber only controled the on-off of electro-magnetic valve with double steady state while the direction of refrigerant flowing was controled. By using this cycle BCD-186CHS direct cooling refrigerator was munufactured. It consumes 0.39 kWh electricity daily under the maximum load. It consumes less than 0.35kWh even 0.31 kWh daily if the variable temperature chamber runs under the economy condition.