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 tubes vacuum has been compromised.
An examination of the tubes shows that the outside is actually 2 layers of glass and a vacuum has been created between them. A good way to demonstrate this would be to fill an empty tube with very hot water and notice that it does not even get warm as you hold the tube in your hands. That is because of the thermos effect¡± created by having a vacuum between the layers of glass.
Material·ªHigh boron-silicon (specially hard) glass 3.3
Film structure·ªGradual change AL-H/AL selective absorbing coated
Sun absorptance·ªlayersfª0.92(AM=1.5) (international standardfª0.86)
Hemisphere emmissivity·ªf_0.086 (80f¦) (international standf_0.09)
Empty solarization parameters·ªfª186¼Of¦/KW(international standardfª175)
Cover tightly solarization amount·ªf_3.6MJ/¼O(international standf_3.8)
Average heat loss coefficient·ªf_0.86W/¼O(international standf_0.90)
Interlayer vacuum·ªf_0.03 Pa (international standf_0.90)
Heat shock resistance·ªUnder the 25f¦ there is no damage after times by using above 90f¦ hot water.
Pressure resistance,can bear·ª0.6Mpa pressure
Hailstibe resustant performance·ªCold water by turns and no damage after strike by hailstone with its grain less than ¬ª25mm.
Product Info:
Model No: SET-01
Diameter of Outer/Inner Tube: 47/37, 58/47
Length of Tube: 1500/1800, 1800
Thickness of Tube 1.60±0.15, 2.0±0.15 2.2±0.15
Technical Specifications:
Iten Specification: Three Targets (operation Temp. around 100°C)
Absorptance of Selective Coating (AM1.5): Alpha >= 92.5%
Emission of Selective Coating(80°C±5°C): sh <= 6.5%
Stagnation Parameter Y >= 240m²°C/kW
Emission of Selective Coating(80°C±5°C): sh <= 6.5%
Solar Radiance Exposure H <= 3.0MJ/m²
Average Heat Loss Coefficient ULT=0.65W/(m²•°C)
Selective Coating Material: SS-AL-N/Cu
Application field Hot water
Vacuum Quality P=3x10-3Pa
Pressure-proof: 0.6MPa
Impact Resistance Steel Ball Test: steel ball with diameter of 30mm fall on the evacuated tube vertically from 450mm height, the evacuated tube is not damaged.
Transmittance of GlassTube t=0.89 (AM1.5ISO9806-1:1994)
Material of GlassTube Borosilicate Glass 3.3
Knots of GlassTube Knots(Ø=1mm) =2 pieces in area of 10mmx10mm; Knots(Ø=, 2.5mm) = 5 pieces in the whole tube.
Specifications:
All glass evacuated tubes are the absorbing component of the solar water heater. They absorb solar energy and convert it into energy used for water heating. Each evacuated tube consists of two glass tubes which are made from extremely strong borosilicate glass. The outer tube is transparent, allowing light rays to pass through with minimal reflection. The inner tube is coated with a specially selected coating which features an excellent solar-radiation absorption rate and minimal reflection properties. The top of the two tubes are fused together and the air contained in the space between the two layers of glass is pumped out while exposing the tube to high temperatures. This "evacuation" of the gasses forms a vacuum, which is an important factor in the performance of the evacuated tubes.
Evacuated tube solar collectors still provide an excellent result on a cloudy day. 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 effect on the function of the evacuated tubes when comparing them to the flat plate solar collectors. This comes due to the insulating properties of the vacuum.
As the key components of the solar collector, the evacuated tubes have a production that is optimized in geometry and performance.The tubes are composed of two concentric glass tubes with in each case are half spherically closed on one side and fused together on the other side.
In order to make the solar power usable, the internal glass tube is provided on its external surface with an environmentally friendly, highly selective layer and is thus designed as an absorber. This coating is thus protected within the vacuum gap. It is an aluminum nitrite sputter layer which is characterized by very low emission and very good absorption.
The evacuated tube is a product with improved geometry and performance and consists of two concentric glass tubes which are sealed in a semi-circular shape on one side and are joined to one another on the other side. The space between the tube is evacuated and then hermetically sealed (evacuated insulation). To use solar energy, the internal glass coated with an environmentally friendly, highly selective la er on the outside, thus turning it into an absorber. The coating is protected in the evacuated space. The aluminum nitride sputter coating used is characterized by an ex u extremely low emission and a high absorption rate
Heat pipe vacuum tube technical parameter
Model: hp58/1800-20
l / 0.43 mm
Outer tank material/thickness: sgcd/ 0.5mm
Angle of collector: 25-85 ¡ã
Rated pressure: 0.7mpa
Heat pipe material: copper; 14/24 mm condenser diameter, 1800 mm pipe length.
Insulation material and thinness: polyurethane foam, 50 mm
Seal: silicon rubber polymer
Manifold material: aluminum alloy
Tank capacity: 100, 150, 180, 200, 250, 300 lite
Advantages:
1. Adopts red copper channel, with great performance of heat exchange
2. Utilize copper heat pipes containing special medium liquid with low boiling point.
3. Work well in all climate, can be function well even in ambient temperature
4. Each heat pipe tube works independent and efficiently and easy to change if necessary.
5. No water flows inside the vacuum tube, no risk of freezing.
Working principle:
1. Solar absorption: solar radiation is absorbed by the evacuated vacuum tubes and converted into heat.
2. Solar heat transfer: heat pipes conduct the heat from within the solar tube up to header.
3. Solar energy storage: water or water mix is circulated through the header, via intermittent pump cycling. Each time the water circulates through the header the temperatures is raised by 5-10oc / 9-18of. Throughout the day, the water in the storage tank is gradually heated.
Packing :standard export carton with foam or wooden box
Delivery: 10-15 working days
We offer products which are designed with your specific requirement in mind.
Inside of tank 304 quality chrome
Outside of tank depend for order with gray colored or 404 shining chrome.
Also we have 4 type of cold water tank 30lt/80lt/130lt/180lt for 24 tubes solar enegy system
30 vacuum tubes
Inside 304 qualty stainless chrome
Outsite 404 quality shiny chrome or gray colored galvanized
Also have 4 kind cod water tank 30lt/80lt/130lt/230lt
