|
parameter
|
copper tube
|
Graphene aluminum tube aluminum tube
|
comparative analysis
|
|
thermal conductivity（W/m·K） |
385 |
278-298 |
The thermal conductivity of aluminum tubes is 68% -73% of that of copper, but after graphene reinforcement, it has surpassed ordinary aluminum tubes (237) and meets the heat exchange requirements of air conditioning |
|
density（g/cm3） |
8.96 |
2.75copper tube |
Aluminum tubes weigh only 30.7% of copper tubes, significantly reducing lifting costs and suitable for installation in high-rise buildings |
|
tensile strength（MPa） |
200-250 |
115-140 |
Copper pipes have higher strength, but aluminum pipes can be matched with pressure requirements through structural optimization (such as thickening by 1.2 times) or through process changes |
|
corrosion resistance |
Medium (requires coating to prevent oxidation) |
Extremely high (graphene passivation) |
Aluminum tubes do not require coating and resist chloride ion corrosion in frozen water (common pain points in air conditioning systems) |
|
Welding/connection process |
Silver Low (copper brittle)soldering required, high cost |
Laser welding/crimping connection |
Aluminum tubes support welding free clamping technology, increasing installation efficiency by 50% and reducing leakage risk |
|
maximum working pressure（MPa） |
25 (wall thickness 0.8mm) |
18-22 (wall thickness 1.2mm) |
Aluminum tubes meet the high-pressure requirements of air conditioning by increasing wall thickness (still 60% lighter than copper tubes) (R410A refrigerant needs to be ≥ 3MPa) |
|
Vibration fatigue resistance |
低（铜质脆） |
High (aluminum has excellent ductility) |
Aluminum tubes are more suitable for outdoor unit vibration environments, reducing the risk of refrigerant leakage |
|
Material cost (yuan/meter) |
80-120（9.52mm） |
35-50 (equivalent specifications) (9.5mm) |
The cost of aluminum tubes has been reduced by 50% -65%, and further decreased after large-scale production |
|
environmentally |
Lead containing solder (requires ROHS certification) |
Lead free process |
Aluminum tubes comply with EU environmental directives and have significant export market advantages |
|
Life cycle (years) |
15-20 |
15-25 |
Aluminum tube maintenance free feature reduces air conditioning after-sales costs |
