Structure

All-glass concetric dual tube geometr

Glass material

Borosilicate glass

Outer lube biameter and length

φ=47 ±0.7mm & =1.5m

φ=58 ±0.7mm & =1.8m

φ=70 ±0.7mm & =2m

φ=37 ±0.7mm & =1.5m

Lnner lube diameter and length

φ=47 ±0.7mm &=1.8m

φ=58 ±0.7mm & =2m

Gtaded Al-N/Al solar selectuve absorbing coating

Construction

Absorbing

Mothod to deposition

DC reactive sputtering

Coating

Absorptance

>91%

Properties

Emittance

<8%(80)

Vacuum

P<5×10-3pa

Stagnation parameter

≥230M²/KW

Solar radiance exposure for obtaining a preset water temperature

≤2.8MJ/M2

Average heat loss coefficient

≤0.8W/(M3)

Lifetime

15 years