A-SUN High Temperature Explosion Proof Vacuum Tubes for solar water heater

Group Solar Vacuum Tubes
Min. Order 1 set
Terms of Payment L/C, Western Union, T/T
Update Time 2018-10-11
Item specifics
Warranty time3
Deliver Time5-15 working days
BrandA-sun,OEM &ODM are acceptable
Life time15 years
Material3.3 high borosilicate glass
Trade TermFOB,CNF &CIF
TypeVacuum Solar Collector
ApplicationSolar Thermal, water heater
  • Description
  • Product review


The Standard

Physical & Chemical Performance

Expansion Coefficient:                                 3.3 x 10-6 / K

Density(g/CM^3):                                         2.23 ± 0.02

Water Resistance:                                        First Class

Acid Resistance:                                            First Class

Alkali-resistance:                                           Second Class

Softening Point:                                             820°C

Temperature Of Divitrification:                  695°C to 1180°C


Technical Data

Melting Temperature:                                1680°C

Forming Temperature:                               1260°C

Softening Point:                                           830°C

Annealing Point:                                           560°C

Hardness:                                                      7


Single Target Tube:

Length:                                                        1800mm± 2mm

Number of Tubes:                                     20

Outer tube diameter:                               58mm±2mm

Inner tube diameter:                                47±2mm

Glass Thickness:                                        1.6mm± 2mm

Structure:                                                   All glass double tube co-axial structure

Glass Material:                                          High borosilicate 3.3 Glass

Absorptive Coating:                                 Graded A1-N/A1 (copper coating)

Coating Property:   

Sediment Method

Single Target Magnertron Sputtering plating

Specific Absorption

 >92% (AM 1.5)

Emission Ratio

 <8% (80°C)


Vacuum:                                                                P<0.005Pa

Stagnation Temperature:                          ≥200°C

Idle Sunning Property Parameters:                  Y=250 ~ 280m^2 . °C /KW

Hailstone bearing ability:                                   Hail Stone with a diameter of ø 25mm

Solar Irradiation for obtaining a present water Temperature:

H≤4.7MJ/M^2 (ø58)

H=4.1~4.4 MJ/M^2

H≤3.7MJ/M^2 (ø47)

H=3.1~3.4 MJ/M^2


Average Heat Loss Coefficient:                   < 0.8W/°C

Efficiency:                                                       93%-95%      


Product Advantages 


1) Excellent material: High borosilicate glass 3.3 is adopted as the raw material. 

2) High thermal efficiency: Pure vacuum layer without impurity. Degree of vacuum is high and lasts long, possessing extremely high absorption to sunlight with extremely low thermal emissivity. 

3) Small thermal losses: Higher degree of vacuum is kept between vacuum heat collection pipes, reducing thermal losses caused by heat conduction and heat convection to the maximum. 

4) Long life: Performance of film plated layer is stable, being not easy to ageing and attenuation. Processes in links of material selecting, production, transportation and quality inspection, etc. are strict with longer service life. 

5).Corrosion resistant: Performance against chemical corrosion is extremely good, appropriate to various kinds of water quality. 

6).High degree cold resistant: Even in high latitude in Northeastern China area with high degree cold temperature bitter cold, hot water can still be used normally, displaying super high heat collection rate.