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用理论分析的方法计算了空调器毛细管长度，并进行了试验研究，理论计算与试验结果比较吻合，表明其计算方法是可行的。同时，为了研究毛细管与制冷剂充注量的相互影响，又对不同毛细管长度及制冷剂充注量的匹配进行了试验研究。试验结果表明：毛细管长度及系统氟里昂充注量对空调器的制冷量、性能系数（αＣＯＰ）均有较大的影响，且二者存在最佳匹配，使得空调器的制冷量及αＣＯＰ均达到最大；制冷剂充注量过多时空调器性能下降较多，说明充注量过多更具危害性。试验结果已用于生产实际。
The capillary length of the air conditioner is calculated by the theoretical analysis method, and the experimental study is carried out. The theoretical calculation and experimental results are in good agreement, which shows that the calculation method is feasible. At the same time, in order to study the interaction between capillary tube and refrigerant charge, the matching experiments of different capillary length and refrigerant charge were carried out. The experimental results show that the capillary length and the system Freon charge have a great influence on the air conditioner’s cooling capacity and coefficient of performance (αCOP), and the two have the best match so that the air conditioner’s cooling capacity and αCOP reach Maximum; air conditioner performance drops too much when the amount of refrigerant charge is excessive, indicating excessive charge more hazardous. The test results have been used in production practice.