Evacuated Tube

Product name：Evacuated Tube

Item：58-1800/47-1800

Details：

We manufacture and export evacuated tubes.   models: 58mm-1800mm                 47mm-1800mm Contact us now for quotation and for more information. http://china-solarheater.com

Heat Pipe Vacuum Tube

Product name：Heat Pipe Vacuum Tube

Item：Heat Pipes

Details：

Heat Pipe Vacuum Tube Characteristics：  A perfect combination of the vacuum tube and the heat pipe. 1) Higher heat efficiency:advanced heat transferring style of the heat pipe,excellent selective absorb coating and perfect combination with high vacuum heat preservation 2）Wide applicable range:as the heat pipe has the less heat feature,it can be started quickly even under cloudy day and collect heat effectively.It can work normally even below -30 degree.As no water in the tube,it can effectively prevent low heat efficiecy due to frost cracking or scaling. 3) Each tube can work independently,and the whole system can still work even if one tube is damaged.The service life of the heat pipe can be longer than 15 years. 4) The unique connection between the heat pipe and the vacuum tube can ensure both sealing and easy to replace the damaged glass vacuum tube. Structure and Principle of Heat Pipe: The heat pipe is hollow with the space inside evacuated, much the same as the solar tube. In this case insulation is not the goal, but rather to alter the state of the liquid inside. Inside the heat pipe is a small quantity of purified water and some special additives. At sea level water boils at 100oC (212oF), but if you climb to the top of a mountain the boiling temperature will be less that 100oC (212oF). This is due to the difference in air pressure. Based on this principle of water boiling at a lower temperature with decreased air pressure, by evacuating the heat pipe, we can achieve the same result. The heat pipes used in  solar collectors have a boiling point of only 30oC (86oF). So when the heat pipe is heated above 30oC (86oF) the water vaporizes. This va pour rapidly rises to the top of the heat pipe transferring heat. As the heat is lost at the condenser (top), the va pour condenses to form a liquid (water) and returns to the bottom of the heat pipe to once again repeat the process. At room temperature the water forms a small ball, much like mercury does when poured out on a flat surface at room temperature. When the heat pipe is shaken, the ball of water can be heard rattling inside. Although it is just water, it sounds like a piece of metal rattling inside. This explanation makes heat pipes sound very simple. A hollow copper pipe with a little bit of water inside, and the air sucked out! Correct, but in order to achieve this result more than 20 manufacturing procedures are required and with strict quality control. Contact us now for quotation and order today.

New Tri-element Vacuum Tube

Product name：New Tri-element Vacuum Tube

Item：58-1800

Details：

New Tri-element Vacuum Tube Characteristics：  Vacuum tubes assimilate the advanced 12 layers of spattering deposition of trivalent technology,high borosilicate glass,gradual change of ALN/AIN-SS/CU selective complex absorptive coating.Ang 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℃ of idle sunning,performing a strong heating ability. Technical Parameters: Structure: all glass concentric dual tube geometer Glass material: borosilicate glass Coating: Grated SS-C/CU Absorptance: >0.92 Emittance: <0.08(80℃) Vacuum: <5×10-3 Pa Stagnation: >230m2. ℃/KW Average heat loss: <0.6w/m2. ℃ Lifetime: >15 years http://china-solarheater.com/

Vacuum Solar Tube

Vacuum Solar Tube  Please check the whole page carefully of the solar tube manufacturing process gallery.  The solar tubes 47-1500, 47-1800, 58-1800 are available for your order. Other models, 58-2000, 58-2100, 100/110-2000, we can make according to your quantity orders.
Description Place of Origin China Model Number VST-CTNO Price Terms FOB,CNF,CIF Brand Name CTNO or OEM Payment Terms T/T, L/C Minimum Order 1 x 40' FCL Supply Ability 350,000pcs/month Delivery Lead Time 7 days Features: Technical Specifications The solar tubes 47-1500, 47-1800, 58-1800 are available for your order. Other models, 58-2000, 58-2100, 100/110-2000, we can make according to your quantity orders.  Length 1500mm 1800mm Outer tube diameter 47mm 58mm Inner tube diameter 37mm 47mm Weight 1.3kg 2.2kg Glass thickness 1.6mm 1.6mm Material Borosilicate Glass 3.3 Borosilicate Glass 3.3 Absorptive coating Graded A1/N/A1 Graded A1/N/A1 Vacuum degree P<5*10 -3 Pa P<5*10 -3 Pa Thermal expansion 3.3*10 -6 /°C 3.3*10 -6 /°C Insolation Temperature >200°C >200°C Absorptance >93% >93% Emittance <8% <8% Heat loss <0.8W/(m2°C) <0.8W/(m2°C) Maximum strength 0.8Mpa 0.8Mpa Resist cold -35 °C -35 °C Resist hailstone Ø25mm Ø25mm Resist wind 30m/s 30m/s Start-up temperature <=25°C <=25°C Item No. Specification Effective collector area m2 Diameter of solar tube Length of solar tube VST-TF-4715 Ø47mm 1.5M 0.0966 VST-TF5818 Ø58mm 1.8M 0.1350 Contact us today for more information . http://china-solarheater.com/ energy@savegreeninc.com

Production process of Vacuum Solar Tubes

Production process of Vacuum Solar Tubes

Solar vacuum tubes

1. Vacuum Glass Tube  Glass evacuated tubes are the key component of the solar collectors. Each evacuated tube consists of two glass tubes. The outer tube is made of extremely strong transparent borosilicate glass, that is able to resist impact from hail up to 25mm in diameter. The inner tube is also made of borosilicate glass tube, but coated with a special selective coating which features excellent solar heat absorption and minimal heat reflection properties. The air is withdrawn (evacuated) from the space between the two glass tubes to form a vacuum, which eliminates conductive and convective heat loss. In order to maintain the vacuum between the two glass layers, a barium getter is used (the same as in television tubes). During manufature this getter is exposed to high temperatures which causes the bottom of the evacuated tube to be coated with a pure layer of barium. This barium layer actively absorbs any CO, CO2, N2, O2, H2O and H2 outgassed from the tube during storage and operation, thus helping to maintaining the vacuum. The barium layer also provides a clear visual indicator of the vacuum status. The silver coloured barium layer will turn white if ever the vacuum is lost. This makes it easy to determine whether or not a tube is operating correctly. Unlike other types of solar collectors, evacuated tube solar collectors still provide excellent results on cloudy days, This is because the tubes are able to absorb the energy from infrared rays which can pass through clouds. Wind and low temperatures also have less of and effect on the function of evacuated tubes when compared to flat plate solar collectors due to the insulating properties of the vacuum. Glass evacuated tubes are aligned in parallel, the angle of mounting depends upon the latitude of your location. In a North South orientation the tubes can passively track heat from the sun all day. In an East West orientation they can track the sun all year round. The shape of the tubes provides superior absorption when compared to flat plate collectors for a number of reasons: As the tube is round, the sun’s rays are always striking the tubes surface at right angles, thus minimizing reflection. If the collector surface is flat, the amount of solar radiation striking the collector surface is only at it’s maximum at midday when the sun is directly above the collector. In the morning or afternoon the sun’s rays strike the collector’s surface at an angle, and thus the amount of solar radiation that the collector is exposed to is reduced. Evacuated tubes, however, are round, and thus the amount of solar radiation striking the collector is relatively constant from mid morning to mid afternoon. This feature maximizes the total amount of solar radiation the collector is exposed to each day. Furthermore, the sun is always striking the tubes at an angle which is perpendicular to their surface thus reducing reflection.

Solar Tube Basic Specifications

Model tape 47 58 Length 1500mm 1800 Outer tube diameter 47mm 58mm Inner tube diameter 37mm 47mm Glass thickness 1.6mm 1.6mm Glass Material Borosilicate Glass 3.3 Borosilicate Glass 3.3 Absorptive Coating AL/N/AL AL/N/AL Absorption coefficient >92% >92% Emission coefficient <8% <8% Vacuum P<5x10-2Pa P<5x10-2 Pa Stagnation Temperature >300oC >300oC Net weight 1.53kg 2.77kg   We can also make 47mm-1800mm tubes, 58mm-1800mm tubes, 58mm-2000tubes, 110mm-2000mm tubes Inner diameter 100mm, 37mm, 48mm, outer diameter 110mm,47mm, 58mm solar tubes, glass tubes, single glass tubes, twin vacuum glass tubes. Contact us today. http://china-solarheater.com energy@savegreeninc.com