High quality price of solar tube well Three-target CU-SS-AL selective coating

      High quality price of solar tube well Three-target CU-SS-AL selective coating     Product Description   VISION Three-target vacuum tube is usually used as absorber for solar water heaters and solar collectors, especially for heat-pipe collector and U pipe collector because its super performance in high-temperature resistance.   VISION glass vacuum tubes are made of borosilicate glass, the solar tube is carefully selected with improved hailstone impact resistant and thermal shock resistance. The evacuated tunnel consists of two concentric glass tubes which are sealed in a semicircular shape on one side and are joined to one another on the other side.   The space between the tubes is evacuated and then hermetically sealed, the internal glass tube is coated with an environmentally friendly, highly ‘sensitive’ layer on the outside, thus turning it into an absorber. The coating is protected against adverse weathering influences within the evacuated space, the three-target spattering coating Cu/SS-ALN(H)/SS-ALN(L)/ALN is characterized by extremely low emission and excellent absorption.   Different from single-target vacuum tube, VISION three-target vacuum tube adopts a hi-tech spattering with 12 layers of solar absorptive coating Cu/SS-ALN(H)/SS-ALN(L)/ALN, which presents the vacuum tube with a much higher solar absorptivity and lower emission ratio. In addition, three-target vacuum tube is specially excellent in heat resistance, the coat will not falling off from inner tube with its temperature rises up to 380oC, much more stable performance and longer lifespan.   Technical Data of VISION Three-target Vacuum Tube:  

Tube structure	All-glass double-tube co-axial structure
Glass material	High borosilicate 3.3 glass
Outer tube size	Φ=47±0.7mm &=1.6±0.15mm, Φ=58±0.7mm &=1.6±0.15mm,    Φ=70±0.7mm &=2.0±0.15mm
Inner tube size	Φ=37±0.7mm &=1.6±0.15mm, Φ=47±0.7mm &=1.6±0.15mm,    Φ=58±0.7mm &=2.0±0.15mm
Tube length	800mm, 1200mm, 1500mm, 1600mm, 1800mm,   1900mm, 2000mm, 2100mm, etc.
Absorber  coating	Coating material	Cu/SS-ALN(H)/SS-ALN(L)/ALN
	Sediment method	Three target magnetron sputtering plating
	Absorptivity	as=0.93 ~ 0.96 (AM1.5)
	Emission ratio	Eh=0.04 ~ 0.06 (80±5 oC)
Vacuum degree	P≤5.0X10-3 Pa
Stagnation temperature	260 ~ 300 oC
Average heat loss	ULT=0.4 ~ 0.6 W/(m2* oC)
Pressure-endure	1.0 Mpa
Hail Resistance	Φ25 mm
Model Number	Tube Size/ MM	Container Loading Quantity (PCS)
		20GP	40GP	40HQ
VTT-T4715	Φ47*1500	4444	8889	10794
VTT-T4718	Φ47*1800	3733	7467	9067
VTT-T5818	Φ58*1800	2625	5250	6375

  Warranty: 15 years international responsibility for VISION solar glass vacuum tube due to original quality problems.   Features of VISION Solar Glass Vacuum Tube:   Tube Design The vacuum tube design used by VISION was originally developed in the 1980s and has been proven to be extremely robust. Referred to as the "Sydney" tube, "twin-tube" or "all-glass", the tube is essentially two glass tubes that are fused at the top and bottom. The inner tube has a solar absorbing coating, and the space between the two tubes is evacuated to form a vacuum.   Strong Glass The tubes are made from a type of glass called Borosilicate, the same base material as used in many Pyrex glass products used in kitchens around the world. Borosilicate glass has the characteristic of being very strong and also has excellent light transparency (>94% ) . The wall thickness of the glass greatly impacts the strength, longevity and naturally also the cost. VISION vacuum tubes are custom made to strict requirements that exceed the industry standards, including a 1.6mm thick wall ensuring excellent strength and resilience to hail impact.  To confirm the strength of the tubes, each batch of evacuated tubes assembled in the VISION factory have randomly selected samples tested by dropping a 30mm / 1.2" diameter steel ball onto the tube from various heights.   Vacuum Insulation The name "evacuated" is used to describe the process that expels the air from within the space between the tube tubes, forming a vacuum. A vacuum is an excellent insulator against heat loss, and so evacuated tubes are able to operate very efficiently when there is a big difference between the inside of the tube and the outside ambient air. For this reason vacuum tubes are the ideal choice for high temperature hot water applications or locations that get cold in the winter.   Barium Getter In order to help maintain the vacuum over the 15-20 year life of the vacuum tube, a barium getter "soaks up" any remaining gases in the evacuated chamber plus any fresh gases such as Nitrogen that can slowly permeate through the glass over time, a process known as out-gassing. This barium layer also provides a clear visual indication of the vacuum status; the silver-colored barium layer turns white if the vacuum is lost making it easy to identify a fault tube.   Solar Absorber The absorber coating comprises a base layer of Aluminum on the outside of the inner glass tube followed by thin layer of the dark colored AL/N material.  These coatings are applied using a method called DC reactive sputtering which is extremely reliable after having been fine-tuned over the past 20 years since it was developed, three-target selective coating with its special elements and coating method enables high-temperature resistance upto 380 °C.   Efficiency The combination of the highly efficient absorber coating and the vacuum insulation means that the coating can be well over 380 °C / 716 °F and the outer glass is cool to touch. In strong sunlight, each vacuum tube can provide over 60 Watts / 204 Btu of water heating output.    Other Tube Designs There are a number of different structural vacuum tube designs that exist. Such as single-target vacuum tube, Three-target purple tube, Super heat tube, Three-cavity tube, Magnetic vacuum tube, Eccentric vacuum tube, Both-side open tube, Heat pipe tube, Metal-glass heat pipe tube, etc.    Extracting Heat The heat produced by an evacuated tube can be extracted in a number of ways, depending on the design.  The most common methods include direct water flow, U tube pipe, pipe-in-pipe or heat pipe.    Advantages of VISION Vacuum Tube Collector:     Comparing with flat plate collector:   1. Much more economical for solar water heating application;   2. Higher efficiency with much less heat loss in glass tube;   3. Working all year round even in subzero temperatures;   4. Inexpensive tube and easy to maintenance;   5. More convenient in parts carring and installation;   FAQ   OEM: Your LOGO information can be made on our solar glass vacuum tubes and carton boxes.   ODM: Design can be made according to your requirements such as tube shape and size etc.   Heat Pipe: Please be noted that single target tube can not be used for heat pipe.     Packaging & Shipping Packaging Details: Export strong corrugated carton outside with thick styrofoam protection inside.   Delivery Detail: Within 5 - 7 days for container order quantity upon confirmed invoice or sales contract.   Our Services Fast response: Your inquiry will be replied within 24 hours via e-mail or online messenger;   Technical support: You have more than 10 years experience from VISION SOLAR for product suggestion, installation guidance, market analysis, etc.   OEM & ODM: We welcome OEM & ODM requirements for tube size, length, coating, logo making;    Sample checking: In spite of quality control in production, samples will be selected and tested to check prior to delivery;    Minimum order quantity: We offer sample sample manufacturing for customers to check VISION quality and service;    Shipping service: VISION company offers to arrange goods shipment to abroad ocean port or inland site, and if necessary to make goods insurance, customs clearance, etc;    Import certificates: VISION company offers to make Certificte Origin CO, FORM A, FORM E, FORM F, customs certification, etc.   Company Information Production & Tube Pictures: