The effect of suction line on the evaporator performance with the using of R-134a has been investigated experimentally. Three types of suction lines (lateral, concentric, coil) have been used with various refrigerant flow rates and air velocities. The results of the concentric suction line gave the highest values of the coefficient of heat transfer compared to the other types. Moreover, the maximum increase of the internal heat transfer coefficient (h_i) and overall heat transfer coefficient (Uo) was achieved for the reference capillary tube as 16% and 50% respectively, when the mass flow rate of refrigerant is 14.87 kg/h and air velocity 3.8 m/s. In addition, the results displayed that the largest values of evaporator effectiveness (ε) have been obtained, when utilized the concentric suction line compared the other types. Thereby, the internal heat transfer coefficient was increased by 9.24% for the concentric suction line with the increasing of air speed from 1.8 m/s to 3.8 m/s at flow rate of the refrigerant is 14.87 kg/h. Finally, the best suction line according to all results such as hi, Uo and ε is the concentric line compared the other types.

已经通过实验研究了吸入管线对使用 R-134a 的蒸发器性能的影响。三种类型的吸入管线（横向、同心、盘管）已用于各种制冷剂流速和空气速度。与其他类型相比，同心吸入管线的结果给出了最高的传热系数值。此外，内部传热系数（h _i) 和参考毛细管的总传热系数 (Uo) 分别为 16% 和 50%，当制冷剂的质量流量为 14.87 kg/h 和空气流速为 3.8 m/s 时。此外，结果表明，与其他类型相比，当使用同心吸入管线时，蒸发器效率 (ε) 的最大值已获得。因此，在制冷剂流量为 14.87 kg/h 时，随着空气速度从 1.8 m/s 增加到 3.8 m/s，同心吸入管线的内部传热系数增加了 9.24%。最后，根据所有结果（如 hi、Uo 和 ε）的最佳吸入线是与其他类型相比的同心线。