All Glass Vacuum Tubes

Features

High solar-thermal conversion and low heat loss

Stable advanced coating up to 380

Long time warranty to 15 years

High level vacuum ensure operation under cold weather


Specifications

Structure
All-glass concentric dual tube geometer

Glass material
Borosilicate glass

Outer lube diameter and thickness
470.7mm &=1.5mm

Inner lube diameter and thickness
370.7mm &=1.5mm

Tube Length
1200(5mm) 1500(5mm)

Absorbing coating properties
Construction
Graded Al-N/Al solar selective absorbing coating

Method to deposition
DC reactive sputtering

Absorbance
91%

Emittance
<8%(80C)

Vacuum
P<5X10 -3 Pa

Stagnation parameter
= 230M 2 C/KW

Solar radiance exposure for obtaining a preset water temperature
= 2.8MJ/M 2

Average heat loss coefficient
= 0.8W/(M 2 C)

Lifetime
15 Yeas

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