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glass vacuum tube
himin solar energy group
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glass vacuum tube

All glass evacuated tubes are the key component of solar collectors. The evacuated tube is similar to a conventional Dewar flask and consists of two borosilicate glass tubes, a glass with high chemical and thermal shock resistance. The outer side of the inner tube is coated with a sputtered solar selective surface. This coated inner tube is closed at one end and sealed at the other end to the outer tube. The annular space between the outertube and inner tube is evacuated to virtually eliminate heat loss by conduction and convection. Himin evacuated collector tubes are produced according to two new patents from the Sydney University exclusively licensed to our company.

The characteristics:
1. High solar-thermal conversion and low heat loss
2. Stable advanced coating up to 380°
3. Long time warranty to 15 years
4. High level vacuum ensure operation under cold weather

Models
#47×1800
#58×1800
#58×1920
#58×2100

Weight
1.73±0.12kg
2.29±0.18kg
2.45±0.20kg
2.67±0.22kg

Structure
All glass coaxial double-layer tubes
All glass coaxial double-layer tubes
All glass coaxial double-layer tubes
All glass coaxial double-layer tubes

Outer tube diameter
#47±0.7mm
#58±0.7mm
#58±0.7mm
#58±0.7mm

Inner tube diameter
#37±0.7mm
#47±0.7mm
#47±0.7mm
#47±0.7mm

Outer Tube thickness
1.6±0.15mm
1.8±0.15mm
1.8±0.15mm
1.8±0.15mm

Inner tube thickness
1.6±0.15mm
1.6±0.15mm
1.6±0.15mm
1.6±0.15mm

Tubes length
1805±5mm
1805±5mm
1925±5mm
2100±5mm

Material of coating
AlN/AIN-SS/Cu
AlN/AIN-SS/CU
AlN/AIN-SS/CU
AlN/AIN-SS/CU

Absorptance
0.94~0.96
0.94~0.96
0.94~0.96
0.94~0.96

Emittance
0.04~0.06
0.04~0.06
0.04~0.06
0.04~0.06

Vacuum
P<=5×10-3pa
P<=5×10-3pa
P<=5×10-3pa
P<=5×10-3pa

Transmittance of Outer Tube
0.91
0.91
0.91
0.91

Stagnation temperature (height)
270~300°
270~300°
270~300°
270~300°

Heat-loss coefficient
<=0.6w/ m2*°)
<=0.6 w/ (m2*°)
<=0.6 w/ (m2*°)
<=0.6 w/ (m2*°)

Bearing hailstone ability
hailstone diameter#25mm
hailstone diameter#25mm
hailstone diameter#25mm
hailstone diameter#25mm

Pressure-endure ability
1MPa
1MPa
1MPa
1MPa

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Category :	Solar
Related Searches :	glass , tube , tubes , vacuum , vacuum tube , vacuum tubes , vacuum tubing , vacuums
Country Of Origin :	China
Listing Type :	Sell
Contact :	Michael lee
Address :	909 hubin middle road Dezhou, Shandong, 253090 China
Telephone :	[86] (534) 2312962
Fax :	[86] (534) 2312962