Tri-Element Vacuum Tube greenhouse heating systems

all glass vacuum tube 1.excellent quality & cheap price 2.higher absorbility & lower emission 3.longer working time Product Description

Specification of All-glass evacuated solar collector tubes: 1. Structure: All glass concentric dual 2. Glass material: Tube geometer 3. Absorptance: Borosilicate glass 4. Emitlance: >0.92 5. Vacuum: <0.08(80 Celsius degree) 6. Stagnation: <5*10-3Pa 7. Lifetime: >15 years Feature: vacuum tubes assimilate the advanced 12 layers of spattering deposition of trivalent element technology, high borosilicate glass, and gradual change of ALN/AL N-SS/CU selective complex absorptive coating. And these make vacuum tubes have high performance of absorptance and low reflection ratio. Through the interlayer, vacuum has a unique effect of thermo, with its temperature up to 380 Celsius degree of ideal sunning, performing a strong heating ability.

Models	Material	Dia(mm	Length	Coating	Vacuum	Transmittance	Bearing hail
47*1500	borosilicate	47	1500	ALN/AiN-SS/CU	<=5*10-3	0.91	25mm
47*1800	borosilicate	47	1800	ALN/AiN-SS/CU	<=5*10-3	0.91	25mm
58*1800	borosilicate	58	1800	ALN/AiN-SS/CU	<=5*10-3	0.92	25mm
58*2100	borosilicate	58	2100	ALN/AiN-SS/CU	<=5*10-3	0.91	25mm

Structure		All glass double tube co-axial structure
Glass material		High borosilicate 3.3 glass
Outer tube diameter and thickness		Φ=47±0.7mm&=1.6mm Φ=58±0.7mm&=1.6mm Φ=70±0.7mm&=2.0mm
Inner tube diameter and thickness		Φ=37±0.7mm&=1.6mm Φ=47±0.7mm&=1.6mm Φ=58±0.7mm&=1.6mm
Tubes length		800mm 1200mm 1500mm 1600mm 1800mm 1900mm 2000mm 2100mm
Absorptive coating property	Material of coating	CU/SS-ALN(H)/SS-ALN(L)/ALN
	Sediment methods	3 target magnetron sputtering plating
	Absorptance	As=0.92~0.96(AM1.5)
	Emission ratio	∑h=0.04~0.06(80°c±5°c)
Vacuum		P≤5.0*10-3(Pa)
Idle sunning property parameters		Y=260~300m2.C/KW
Solar irradiation for obtaining a preset water temperature		H≤4.7MJ/m2(Φ58)	H=3.7~4.2MJ/m2
		H≤3.7MJ/m2(Φ47)	H=2.9~3.2MJ/m2
Average heat loss coefficient		-U(LT)=0.4~0.6W/(m2.°c)

Tri-Element Vacuum Tube greenhouse heating systems