1.CE,CCC,ISO9001 certificated
2.Advanced design,high quality
3.Anti-freeze,high efficient absorption
4.Reasonable price,
Port: ningbo or shanghai
Minimum Order Quantity: 500 Piece/Pieces
Supply Ability: 3000 Piece/Pieces per Week
Payment Terms: L/C,T/T,Western Union
Contact Supplier
Packaging Detail: standard export cartons packing or Customer requirements, also samples packing with wooden case.
Delivery Detail: about 10 work days after confirm.
Features;
Our All-glass Vacuum Tube is made of dual borosilicate glass tubes, the space between the two tubes is evacuated. The AL/N/AL selective coating on the outer wall of the inner tube absorbs sunshine and transforms it into heat which in turn heats the cold water in the inner tube. When the water in the tube is heated, its density will decrease and will go upward into the tank; Meanwhile the cold water in the tank will flow down into the tube due to its greater density. Thus, the circulation and heat-exchanging in the system is completed. The color of the inner tube is black-grey. This vacuum tube has a high heat-efficiency and low price. It is suitable in areas with winter temperature above below zero 20º C.
Standard:
(1)Φ 47mm, Length 1500mm/1600mm/1800mm/1900mm/2000mm
(2))Φ 58mm, Length 1500mm/1600mm/1800mm/1900mm/2000mm
(3)))Φ 70mm, Length 1500mm/1600mm/1800mm/1900mm/2000mm
Technical specifications
| Item name | all-glass vacuum tube | |
| Structure | All-glass double-tube co-axial structure | |
| Glass material | High borosilicate 3.3 glass | |
| External pipe diameter and thickness | dia. =47± 0.7mm & =1.6mm dia. =58± 0.7mm & =1.6mm dia. =70± 0.7mm & =2.0mm | |
| Internal pipe diameter and thickness | dia. =37± 0.7mm & = 1.6mm dia. =47± 0.7mm & = 1.6mm dia. =58± 0.7mm & = 1.6mm | |
| Pipe length | 1500mm 1600mm 1800mm 1900mm 2000mm | |
Absorptive coating property | Structure | AL/AL-ALN(H)/AL-ALN(L)/ALN |
| Sediment method | Single target magnertron sputtering plating | |
| Specific absorption | a s =0.90~0.93(AM1.5) | |
| Emission ratio | 0.05~0.075( 80 º C ± 5 º C ) | |
| Vacuum tightness | P ≤ 5.0× 10-³ Pa | |
| Idle sunning property parameters | Y= 220 ~ 260m² º C /KW | |
| Solar irradiation for obtaining a preset water temperature | H ≤ 4.7 MJ/ m² (dia. 58) | H=4.1~4.4 MJ/ m² |
| H ≤ 3.7 MJ/ m² (dia. 47) | H=3.1~3.4 MJ/ m² | |
| Average heat loss coefficient | U lt =0.6~0.7W/( m² . º C) | |
| Service life | more than 15 years | |
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