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     (3)使用毛细管时,内径和长度应有一定的比例 例。 如果毛细管太短,流动阻力小,流速大,蒸汽很热。 蒸汽很容易在毛细管中混合,降低冷却效率。 并导致液体回落到压缩机并导致液体冲击 如果毛细管太长,流动阻力很大,导致排气压力太高,进入蒸发器的液体量不足,导致抽吸气压太低。根据数据,条件在相同的流速下毛细管的长度大约与4.6的内径成比例,即 L1 / L2 =(D1 / D2)4.6。