Product

Description:

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. life span is 15 years
4. High level vacuum ensure operation under cold weather

Models	Ф47×1800	Ф58×1800	Ф58×1920	Ф58×2100
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	Ф47±0.7mm	Ф58±0.7mm	Ф58±0.7mm	Ф58±0.7mm
Inner tube diameter	Ф37±0.7mm	Ф47±0.7mm	Ф47±0.7mm	Ф47±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 diameterФ25mm	hailstone diameterФ25mm	hailstone diameterФ25mm	hailstone diameterФ25mm
Pressure-endure ability	1MPa	1MPa	1MPa	1MPa