r404a
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Some key problems of design of R404A / R23 cascade refrigeration unit
R404A/R23复叠制冷机组设计中的几个关键问题
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The refrigeration system consists of two screw compressors utilizing R404A fluid as the refrigerant .
在冷冻单元包括两台螺杆式压缩机,使用R404A作为制冷剂。
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The refrigerants of pre-cooling cycle and refrigeration cycle were R404A and R740 .
预冷系统和制冷循环的制冷剂分别为R404A和R740。
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The cascade refrigeration unit using R404A / R23 as refrigerant can achieve low temperature , - 80 ℃, and has the advantage of environmental protection .
以R404A和R23为制冷剂的复叠制冷机组,不但满足了制取-80℃的低温要求,还具有环保的优点。
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Based on the experimental data collected , the formulations are selected which can predict accurately in-tube condensation heat transfer coefficients for R290 and R404A .
对于R290和R404A,分别根据各自光管、内螺纹管内凝结换热系数的关联式计算数值与实验数据的比较,筛选出了相应预测精度较好的理论模型。