Refrigerant tube, used in heat exchanger for air conditioning system, has outer diameter of not larger than five point three millimeters, with series of internal spiral fins formed on inner surface of tube

摘要

Refrigerant tube (51) has outer diameter of not larger than 5.3 mm, with series of internal spiral fins (53) formed on inner surface of tube while defining series of grooves (55) between them. Tube has thickness (t) of 0.16 mm to 0.2 mm, while number of internal fins is set to 40-50. Internal fins each have spiral angle of 6[deg] to 20[deg], height (H) of 0.15 to 0.18 mm, and projection angle (beta ) of 38[deg] to 42[deg].