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Evacuated Vacuum Tube--Presentation
• Solar energy background in China • Const. and advantage of vacuum tube • Types of vacuum tube • Solar heat pump • Manufacture- process • Project gallery
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1:SOLAR ENERGY BACKGROUND IN CHINA • The world solar miracle is focused in China .The installed area of China’s solar thermal
utilization shares 76% of the world ------ <<Renewable energy of the commercial world> • The scale of China’s solar industry lists the first in the world. And the renewable
energy’s role in China is rapidly turning from supplementary energy to essential energy --- the statistics of the Environment Planning Department of UN, on the climate change conference of the UN convened in Bali of Indonesia, at the end of 2007.
• The key technology of the all- glass- evacuated solar collector tube is “graded AI-N/AI selective coating”. First invented by Prof. Yin.
MARKET SHARE “ Made in china”
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2:Const. and advantage of vacuum tube Woking Principal
• All Glass evacuated vacuum tubes are the key component of the Solar Collectors and Solar Water Heaters.
STRUCTURE OF GLASS EVACUATED VACUUM TUBE
1) Inner Tube 2) Solar Selective Absorption Coating 3) Vacuum Space 4) Outer Tube 5) Spring holder 6) Getter –barium,aluminium,nickel 7) Inspiration Film
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4:STRUCTURE OF GLASS EVACUATED VACUUM TUBE • 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, but coated with a special selective coating, which features
excellent solar heat absorption and minimal heat reflection properties . • The air is evacuated from the space between the two glass tubes to form a vacuum, which eliminates
conductive and convective heat loss. The tubes are able to absorb the energy from infrared rays which can pass through clouds.
5:GLASS TUBES V/s FLAT PLATE COLLECTORS
• The shape of the tubes provides superior absorption when compared to flat plate collectors for a number of reasons:
• 1) As the tube is round, the sun's rays are always striking the tubes surface at right angles, thus minimizing reflection. 2) If the collector surface is flat, the amount of solar radiation striking the collector surface is only at its 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 reduced..
• Wind and low temperature also have less of effect on the function of evacuated tubes when compared to flat plate solar collectors due to the insulating properties of the vacuum.
• ALL 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.
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6:ADVANTAGES OF VACUUM TUBE As the key components of solar collector, the evacuated tube is a product that is optimized in geometry and performance.
• Excellent solar thermal conversion and low heat loss. • Long vacuum life time . • Can be used all year round in cold climate areas. • Can be quasi-tracking for a north-south orientation of tubes and four season quasi-tracking for an east-west
orientation of tubes 7:TYPES OF VACUUM TUBE
• All-glass evacuated vacuum tube • Three-layer concentric glass tube • Three target vacuum tube • Three target copper vacuum tube • Diamond glass vacuum tube • Copper heat tube
8:ALL-GLASS EVACUATED VACUUM TUBE
• Detailed Product Description • All glass evacuated Vacuum tube made of high borosilicate glass, use the Graded AI-N/AI selective
surface sputtering –solar selective absorbing coating technology. • Coating material : aluminium –nitrogen-aluminium. etc.
• These make vacuum tubes have high performance of absorption and low reflection ratio. • Through the interlayer, vacuum has a unique effect of thermo, with its temperature up to 380 degrees of idle
sunning, performing a strong heating ability. ALL-GLASS EVACUATED VACUUM TUBE
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SOLAR WATER HEATER SYSTEM
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TECHNICAL SPECIFICATIONS Types All-glass evacuated vacuum tube
Configuration Two-concentric borosilicate glass tubes
Glass-thermal expansion coefficient 3.3×10-6/℃ Solar-selective-absorbing-coating-Technology
Graded Al-N/Al selective surface, sputtering
Absorbance Rate after coating(AM1.5) ≥94.5% Absorbance Rate after Evacuating(AM1.5)
≥92.5%
Emission Rate after coating(80±5℃) ∑≤6.5%
Emission Rate after Evacuating(80±5℃)
∑≤7.5%
Average Heat Loss Coefficient ≤0.75W/(㎡℃) Selective Coating Material Aluminium nitrogen-aluminium
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.
Vacuum Degree ≤3×10-3Pa Pressure 0.6mPa
Transparent ≥0.89(AM1.5/SO9806-1:1994)
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9:THREE-LAYER CONCENTRIC GLASS TUBES • Detailed Product Description • Compare to double-layer concentric borosilicate glass tubes ,the three layer tubes add one more
hollow layer ;
• Super and strong absorption • Siphonage makes heat commutation faster • The hollow layer to reduce water stagnation • The vacuum layer to have super and strong preservation
THREE-LAYER CONCENTRIC GLASS TUBES
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TECHNICAL SPECIFICATIONS Types Three-layer concentric glass tubes Configuration Three-layer concentric borosilicate glass tubes
Glass-thermal expansion coefficient 3.3×10-6/℃ Solar-selective-absorbing-coating-Technology
Graded Al-N/Al selective surface, sputtering
Absorbance Rate after coating(AM1.5)
≥94.5%
Absorbance Rate after Evacuating(AM1.5)
≥93.5%
Emission Rate after coating(80±5℃) ∑≤6.0% Emission Rate after Evacuating(80±5℃)
∑≤6.5%
Average Heat Loss Coefficient ≤0.70W/(㎡℃) Selective Coating Material Aluminium nitrogen-aluminium 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.
Vacuum Degree ≤3×10-3Pa Pressure 0.6mPa
Transparent ≥0.89(AM1.5/SO9806-1:1994)
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10:THREE TARGET VACUUM TUBE • Detailed Product Description
• New intervene film technology : utilize copper aluminium and titanium three target film technology. • Coating material add aluminium nitrogen-aluminium, copper ,stainless steel.
• Excellent heat preservation feature: Three target vacuum pipe utilize super fine copper mirror, hot water is available in
-30 ℃ condition. • The inner pipe cleaning and gas discharge has strict procedure
• Anti aging and attenuation : common vacuum pipe will be aged and attenuated in high temperature and shining condition
(250℃). Three target vacuum pipe can bear 400℃, the life of the pipe is extended greatly..
• High heat efficiency:12% higher than common vacuum pipe., • vacuum layer is pure without impurity. Vacuum degree is high and heat loss is 65%.less than common vacuum pipe.
Frost crack will never happen. THREE TARGET VACUUM TUBE
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SOLAR WATER HEATER SYSTEM
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TECHNICAL SPECIFICATIONS Types Three target vacuum pipe
Glass-thermal expansion coefficient 3.3×10-6/℃ Solar-selective-absorbing-coating-Technology
utilize copper aluminum and titanium three target film technology.
Absorbance Rate after coating(AM1.5) ≥94.5% Absorbance Rate after Evacuating(AM1.5)
≥93.5%
Emission Rate after coating(80±5℃) ∑≤6.0% Emission Rate after Evacuating(80±5℃)
∑≤6.5%
Solar Radiance Exposure ≤3.0MJ/㎡ Average Heat Loss Coefficient ≤0.70W/(㎡℃) Selective Coating Material Aluminium nitrogen-aluminium ,copper ,
stainless steel .etc. 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.
Coating Lighter Area The coating color shall be even with lighter area shall be smaller than 50mm.
Vacuum Degree ≤3×10-3Pa Pressure 0.6MPa Transparent ≥0.89(AM1.5/SO9806-1:1994)
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11:THREE TARGET COPPER VACUUM TUBE • Detailed Product Description • New intervene film technology : utilize copper aluminum and titanium three target film technology. • Coating material add aluminum nitrogen aluminum, copper ,stainless steel. coating time use longer than
three target tube ,and stronger coating film. • Excellent heat preservation feature: Three target copper vacuum pipe utilize super fine copper mirror,
hot water is available from 0 to -30 degree condition.
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12:DIAMOND GLASS VACUUM TUBE
• Compare to three target vacuum tube, diamond glass vacuum tube ,outer tube made to diamond shape . • It has the higher ability to absorb the sunshine. • This outer shape can be supplied in all model.
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13:COPPER HEAT TUBE • Solar vacuum tube with straight copper heat pipe, there is anti-freeze liquid inside as medium transferring
of heat. • By the design the water never come into vacuum tube immediately so the tube will never be broken in low
temperature in winter. • High quality of three-elements as rose copper, stainless steel and aluminum nitride planting layers. • Heat absorption rate can reach more than 93%, certify enough power for hot water requirement. • We use this type for separate pressurized system or integrative pressurized system.
COPPER HEAT TUBE
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