Ecvv Trade
Qingdao Allrise Import & Export Co,Ltd

China Manufacturer with main products: Pentahydrate Borax, Decahydate Borax, Boric Acid, Evacuated vacuum tube, Borosilicated glass

Home  >Products Catalog > Evacuated tube

Evacuated tube

FOB Price: 15.00 - 20.00 USD/Piece
Supply Ability: 10,000 Piece/Pieces per Day
Shipping: Qingdao
Payment Terms: L/C, T/T
In Stock

Related products from verified members

Export Markets: North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe
Place of Origin: Shandong in China
Packaging Details: Carton with inside

Specifications

       

           The tubes are made from low emissivity borosilicate glass (glass with a very low iron content that has superior durability and heat resistance ) with an all-glass seal and they employ AL/N on AL selective coating, which enables the use of the whole solar energy spectrum to generate heat; this produces greater thermal efficiency in bright sunshine but also produces high efficiency in overcast or diffuse sunlight conditions. Further, the tubes are evacuated and have a barium getter (vacuum indicator) which changes color from silver to white if a tube’s vacuum has been compromised.
           Why a vacuum? As you would know if you have used a glass lined thermos flask, a vacuum is an excellent insulator. The vacuum eliminates a physical connection between the two glass layers of the tube which means there is nothing to transfer thermal energy so the heat cannot escape! This is important because once the evacuated tube absorbs the radiation from the sun and converts it to heat, we don't want to lose it!!  The vacuum helps to achieve this. The insulation properties are so good that while the inside of the tube may be 150oC / 304oF , the outer tube remains within a few degrees of the ambient air temperature. This means that evacuated tube water heaters can perform well even in cold weather, when flat plate collectors perform poorly in these conditions due to 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 manufacture of the evacuated tube this getter is exposed to high temperatures causing the bottom of the evacuated tube to be coated with a layer of pure barium. Called a "getter", this barium layer actively absorbs any CO, CO2, N2, O2, H2O and Hout-gassed from the evacuated tube during it's lifetime and increases the longevity of the vacuum.  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.
 
                                                                         Evacuated Tube
Name
Single target
Double target
Three target
Material
High  borosilicate glass 3.3
CTE
3.3×10-6/k
Thickness of tube
1.6mm—2.5mm
Absorptance
≥0.92
≥0.91
≥0.95
Emittance
≤0.07
≤0.05
≤0.05
Vacuum Tightness
P≤3×10-2Pa
Anti-mechanical
shock
No damage under the shock of 30mm steel ball and the height of 450mm
Quality experiment
Mirror surface loss no less than 50% under the 350℃ in the 48 hours
Pressurization
experiment
Keep one minute under the 0.6MPa
 
 


Service Process

Service Guarantee

  • Free Service Charge

    ECVV doesn't charge any service fee to Buyers for buying this product.

  • ECVV Supply

    ECVV is responsible for supply, and provides product quality inspection, fund supervision and supply chain services.

  • Product Quality Commitment

    ECVV China Sourcing Agent will assess the reputation and supply ability of the factory and conduct field trips to select the high-quality Chinese factories for buyers.

  • Deposit Service Commitments

    In order to improve the quality of service, ECVV will charge for a 100CNY deposit for the agent purchasing order, and the deposit will be part of subsequent purchasing costs.

    After paying a deposit, if the purchasing order is not completed because of unsatisfied ECVV services, ECVV will refund your deposit.

Vacuum Evacuated Tube from this supplier

Tier 1 Brand & OEM 270W 280W    
FOB Price: 0.16-0.21 USD/Watt
Min Order: 86400 Watts
Fast Installation GS Rooftop Mounting System    
FOB Price: 100.00-2000.00 USD/Set
Min Order: 1 Set
Blue Anti-Reflecting Coating (Silicon Nitride) Aluminum Back Surface Field 1.5mm Wide Bus Bars 2.0mm Wide Soldering Pads    
FOB Price: 100.00 USD/Piece
Min Order: 10000 Pieces
380V RS485/CAN/GPRS Top Professional Water Grid Tie Solar Pump Inverter    
FOB Price: 1,000.00-1,500.00 USD/Piece
Min Order: 1 Piece
15000w Rated Output Power Three Phase Solar Pump Inverter    
FOB Price: 1,000.00-2,000.00 USD/Piece
Min Order: 1 Piece

More products from other suppliers

Tier 1 Brand & OEM 270W 280W    
FOB Price: 0.16-0.21 USD/Watt
Min Order: 86400 Watts
1000 Watts solar borehole pump for water solar pump in rajasthan for borehole    
FOB Price: 299.00-349.00 USD/Piece
Min Order: 1 Piece
2800watt Solar Cooker    
FOB Price: 100.00-180.00 USD/Set
Min Order: 1 Set
Heating Pipe    
FOB Price: 5.00-25.00 USD/Piece
Min Order: 500 Pieces

Can't find a suitable Supplier or product? Entrust ECVV to purchase the well-chosen Chinese products with high cost performance.

Learn More>> Start Safebuy Order

Communicate with Supplier

Sourcing from ECVV
Join Facebook Group