(1) If a Φ 8 copper tube is used in the freezer, its length should be 15cm/L, where L is the effective passenger volume and refers to the actual measurement inside

The volume calculated based on the wall diameter of the juice.

(2) If a Φ 8 copper tube is used in the testing area, its length should be 2cm/L, where L is the effective volume.

(3) If using a Φ 6 copper tube, the length ratio to using a Φ 8 copper tube is 4:3

(4) Due to differences in inner diameter, wall thickness, and the type of compressor used, the length of the capillary tube selected must be determined through experimentation. That is, the capillary tube should be connected to the compressor's suction port and exhaust port, and the appropriate length should be determined when the pressure value at the compressor's exhaust port is 1MPa after operation. For example, ① the width, depth, and height of the "freezer compartment" are 37cm, 37cm, and 27cm, respectively, with effective volumes of 36L and 96L. If a Φ 8 copper tube is used, the length of the tube should be 5.55m; ② the width, depth, and height of the "freezer compartment" are 70% of the former, which is 3.88m; the width, depth, and height of the "test area" are 44cm, 44cm, and 80cm, respectively. After subtracting the space occupied by the compressor and other components from the calculated passenger volume, the actual volume should be 149L, and the length of using a Φ 8 copper tube is 2 and 98m. The experiment found that a capillary length of 3.2m is more suitable.