Solar Collector Water Heater

Tri-element Hitech vacuum tube performance and specification:

Tube structure		All-glass double deck co-axial structure
Glass material		Borosilicate 3.3 glass
Outer tube diameter and glass thickness		47±0.7mm; Glass thickness 1.6±0.15mm
		58±0.7mm; Glass thickness 1.6±0.15mm
		70±0.7mm; Glass thickness 2.0±0.15mm
Inner tube diameter and glass thickness		37±0.7mm; Glass thickness 1.6±0.15mm
		47±0.7mm; Glass thickness 1.6±0.15mm
		58±0.7mm; Glass thickness 1.6±0.15mm
Tube length		1200mm,1500mm,1600mm,1800mm,1900mm; 2000mm,2100mm* with tolerance of 5mm
Absorber coating	Coating material	CU/SS-ALN(H)/SS-ALN(L)
	Sediment method	Three Targets magnetron sputtering plating
	Absorptivity	α: 0.930.96 (AM1.5)
	Emittance	ε: ≤ 6.0 % (80±5)
Vacuum degree		P≤5.0X10-3 (PA)
Transmittance of glass tube		T≥0.89 (AM1.5 ISO9806-1:1994)
Stagnation temperature		Y: 240260/kW
Average heat loss		ULT≤0.60 W/()
Hail resistance		25 mm
Pressure-endure		0.6 MPa

Specifications
Tri-element Hitech Solar Vacuum Tube: Add a completely closed galss tube into single-target or three-target all glass vcuum tube
Tri-element Hitech All-Glass Solar Vacuum Tube: Add a completely closed galss tube into single-target or three-target all glass vcuum tube. Tri-element Hitech Vacuum Tube will can decrease water when heat exchaneg so that the rise of temperature will be 130% faster.
Specifications of tri-element hitech all-galss solar vacuum tube:
Tube Structure: All-glass duble deck co-axial structure  Galss
Material:  High borosilicate 3.3 glass
Outer tube diameter and glass thickness:
Φ=47±0.7mm gt=1.6±0.15mm  Φ=58±0.7mm gt=1.6±0.15mm   Φ=70±0.7mm gt=2.0±0.15mm
Inner tube diameter and glass thickness:
Φ=37±0.7mm gt=1.6±0.15mm  Φ=47±0.7mm gt=1.6±0.15mm   Φ=58±0.7mm gt=1.6±0.15mm
Tube Length: 800mm 1200mm 1500mm 1600mm 1800mm 1900mm    2000mm   2100mm
Absorption coating property:
Coating Material: CU/SS-ALN(H)/SS-ALN(L)/ALN    Emmition Ratio: E∑h=0.04~0.06(80±5)c
Sediment Method: Three target magnetron sputtering plating     Absorptivity: As=0.93~0.96(AM1.5)
Vacuum Degree: P≤5.0*10-3Pa)  Hail Resistance: Φ25mm
Stagnation temperature (temperature inside of empty evacuated tubes): 260---300c
Average heat loss: ULT 0.4W---0.6W/m2*c  Presure endure: 1MPa