Company Profile
About Us
A leader in China's solar thermal market
The largest and most advanced production base for solar vacuum tubes
The Integrate service provider for new energy system
The drafter of the latest national standard for 3.3 high borosilicate glass
Tianxu solar, established in 2002, is a world-renowned, award-wining, high-tech company, leading designer and manufacturer of high borosilicate glass tubes and new energy products including solar water heaters, solar vacuum tubes, solar heat collecting project, air source heat pump, photovoltaic products, etc.
Tianxu's scale is far ahead of other companies in the industry. There are 10 sets of electric furnaces, 70 sets of solar vacuum tube production line and 3 sets of solar water heater production lines. The annual output of one million tons of high borosilicate glass, over 16 million solar vacuum tubes makes Tianxu the largest manufacturing base of high borosilicate glass tubes and solar vacuum tubes.
In 2015, Beijing Tsinghua Industrial Development Institute Shandong Branch settled in Tianxu to better promote the R& D, marketing and application of clean energy with Tsinghua University's strong scientific research strength and Tianxu's manufacturing ability. Meanwhile, Tianxu established a joint venture company with Beijing Tsinghua Solar Co., Ltd- the solar vacuum tube technology initiator in the world. The newly established company has the world's most advanced solar vacuum tube production lines.
Tianxu solar has grown into the most influential company in Chinese solar industry . All of our products are manufactured with a strong emphasis on ease of installation to provide optimum integration of solar water systems into building design, while aiming to minimize the environmental impact of all products and operations. Besides, we attach a particular attention on customer service .
Tianxu is at the forefront of most of solar thermal technologies, as we are currently using our expertise to also work on solar space heating, solar cooling , seawater desalination , air source heat pump, computer controlled heating systems and photovoltaic application systems.
Here at Tianxu Solar systems Ltd we are committed to investing technology and manpower to achieve a bright and clean future, and to providing simple and effective solutions for families and businesses concerned about climate change and rising energy costs .
What is all-glass heat pipe?
1. Traditional all-glass evacuated tubular solar collector
Chinese traditional all -glass evacuated tubular solar collector (Fig.1) owns the prop erty of using vacuum as insulating material. Vacuum is highly more efficient than any other artificial material that can particularly be found in Western flat collector. Besides, a specific coating selected by our company for its absorbing properties is used to attracts solar energy, th en encapsulated by the vacuum. The vacuum environment can last over 15 years.
2. Improved all-glass heat pipe
Improved all -glass heat tube, although widely inspired by traditional all -glass heat tube, still features important distinctions, proving to be highly more efficient and safer.
2.1 Unsealed open end VS condenser tube
The traditional evacuated tubular solar collector is designed with an unsealed open end, directly connected with the inner cylinder of th e water storage tank . Th en the water circulates between b oth of them. On th e contrary, the improved all -glass heat pipe is designed with a sealed end made of a silicon cover, called condenser tube, functioning as the water storage tank . The main consequence is that there is no water operating in the solar collector.
2.2 Shockproof ring
The shockproof is made of stainless steel and ensures inner tube and outer tub e fixed.
2.3 Heat transfer fluid
The heat transfer fluid inside the tube is Tsinghua Solar patent material and can operate efficiently even at - 40 ºC in cold weather.
3. Operating principle of the improved all-glass heat pipe
Based on the structure of traditional all -glass evacuated tubular solar collector and years of research and experiments, Tsinghua Solar first invented the improved all-glass heat pipe in China solar thermal industry, whose principle is described below:
When the high efficiency selective absorbing coating absorbs solar radiation, it converts solar energy into heat energy. The heat transfer fluid patented by Tsinghua Solar owns the property of low boiling point and low freezing point .
The fluid temperature rises through solar energy absorption process, exceeding its boiling temperature. Consequently, it gasifies and moves towards the upp er part of the vacuum tub e, until it reaches the condenser silicon cover, connected to the inner cylinder of the water storage tank.
The cold water in the tank's temperature is lower than the heat transfer fluid, so that the gasified heat transfer fluid condenses and turns back into liquid.
It goes down to the bottom of the tube by gravity, then absorb solar energy again. Meanwhile, the water in the storage tank has been heat through heat exchange process.
This natural circulation gradually heats the water in the tank.
Fig.6 Operating principle of a sola r water heater with all-glass heat pipes Tsinghua Solar Systems Ltd
Our Advantages
What are the advantages of all -glass heat pipe?
As there is no water operating in the solar tube, the improved all -glass tube solves the problems of freezing, leaking, scaling and cracking which are rampant in traditional solar water heater systems.
1. Anti-freezing
Traditional all -glass evacuated tubular solar collector is operating with water inside the tube. In cold weather especially during winter, water inside the tube can freeze and break the solar collector. It is a big threat to people's personal safety and property. Besides , most solar water heaters cannot work efficiently in winter because of the water freezing problem. Tsinghua Solar patent heat transfer fluid will not freeze even at - 40 ºC in cold weather.
Tsinghua Solar all -glass heat pipe solves this problem and has perfect performance in winter.
2. Anti-leaking
Compared to traditional all -glass evacuated tubular solar collector, Tsinghua Solar all -glass heat pipe has the advantage of being anti -leaking.
Considering the glass material of the tubular solar collector, it can be bro ken during extreme weather, as hailstone. I n traditional systems, once the solar collector is broken, water in the tank will all flow out, as the solar collectors are directly connected with th e tank. Only if the broken solar collector is replaced can the solar water heater continue to service.
This situation will never happen to solar water heater with Tsinghua Solar improved all -glass heat pipes. Since the all -glass heat tube end is sealed with a condenser tube, a heat pipe or more breaking in the middle will not drag along a water flowing out fro m the tank. Besides, the solar water heater can still work normally.
3. Anti-scaling
Water quality is a very important issue during the service of solar water heater. In bad water quality areas, for instance, some areas in the North of China, the concentration of Ca2+ and Mg2+ is too high; scaling situations are common and very serious. For large-scale solar water heating projects without water pretreatmen t, the normal operation of the system is highly affected and the solar collecting efficiency is getting lower and lower. The piping system is often blocked, too. Scale deposits in the tubes and tank have to be cleaned regularly to maintain the normal service of the system.
The improved all -glass heat pipe solves this problem. Because it is operating without water in the tubes, there will be no scale deposit in the tank. Given that water in the tank is indirectly heated, scale deposit i n the tank is greatly decreased, and there will be no influence of scaling i n the tank to the solar collecting efficiency.
Product Parameters
4 . Comparison with other type of collector
4.1. Comparison performance / cost
| Typ e of collector |
Performance Coating |
Performance collector |
Cost/m2 (USD) |
| Flat plate |
75-95% |
40-75% |
100-150/ |
| Copper heatpipe |
90-95% |
50-75% |
200-250/ |
| Glass heatpipe |
90-95% |
45-70% |
70-90/ |
| Vacuum tub e |
86-95% |
45-68% |
50-150/ |
| Plastic sheet |
40-60% |
20-40% |
30-50/ |
The performance of th e coating represents the ability of the collector to attract the solar radiations and convert them into heat.
The collector performance represents the ability of the collector to maintain this heat inside the tubes.
Glass heatpipe and vacuum tube possess the b est relation performance/ cost. Indeed their costs are divided by two compared to a flat plate collector or a copper heatpipe collector, for a performance equal or almost equal.
Glass heatpipe and vacuum tube are the most competitive collectors on the market.
4.2. Technical specifications
| Type of collector |
Aperture aera |
Highest temperature |
Pressure |
Circulation liquid |
Anti-frozen (/100) |
Anti-corrosion
(/100) |
| Flat plate |
2m2 |
120°C |
0-6bar |
W G |
50 |
80 |
| Copper heatpipe |
2m2/ 3m2 |
180°C |
2-6bar |
G |
60 |
80 |
| Glass heatpipe |
2m2/3m2/4m2
|
150°C
|
0-1bar |
W G |
70 |
85 |
| Vacuum tube |
2m2/3m2/5m2/7m2
|
200°C
|
0-6bar |
W G |
80 |
85 |
| Plastic sheet |
2m2/5m2 |
50°C |
0-2bar |
W |
0 |
100 |
W---WATER G - GLYCLO
Glass heatpipe can reach 150°C, not far away from the high performance of copper heatpipe, and can simply be used under a standard pressure of 0 to 1 bar.
Vacuum tube provide the highest performance, with 200°C, under a range of pressure from 0 to 6 bars, allowing them to comply with the European certification requirements.
In addition to that, they both can be used with glycol or water, as their natural anti -frozen performance is astonishing (70% and 80%), far better than flat plates and copper heatpipe.
Their natural anti -corrosion properties (85%) overcome all the o ther kinds of collectors as well (excepted of course a plastic sheet collector).
4.3. Maintenance, Installation and Design
Typ e of collector
|
Design |
Installation |
Maintenance |
| Flat plate |
D2 |
C2 |
E1 |
Copper heatpipe
|
D2 |
C2 |
E0 |
Glass heatpipe
|
D1 |
C1 |
E0 |
| Vacuum tub e |
D2 |
C2 |
E0 |
| Plastic sheet |
D0 |
C0 |
E-1 |
E- EASY C - COMPLICATION D - DESIGN
Glass heatpipe and vacuum tube are easily designed and installed on any roof, wall or balcony. Maintenance is convenient too, far more than a flat plate collector.
Production Bases
Complete Solar Thermal Industry Chain
In solar thermal industry, we start from the silica sand, to the raw tubes, solar vacuum tubes, solar water heaters to the project, we have a complete industrial chain which is outstanding in this industry.
Certifications
HONORS
"Shandong Famous Trademark"
- "Quality Leading Brand in National Solar Thermal Industry".
- Listed in the government energy-saving product purchase list for four consecutive years.
- As the vice chairman unit of China Solar Thermal Utilization Industry Alliance, the vice president unit of Shandong Solar Energy Industry Association, and the member of the National Solar Standardization Technical Committee.
- National "keep contacts regard credits"
- China Mesotherm Heat Utilization Conference Technology Innovation Honor
- National Solar Thermal Industry Top Brand for Quality
- China Solar Thermal Industry Advanced Unit for After-sales Service
- China Solar Thermal Project Design & Engineering Certification
- National Industry Standard Technical Committee for Standardization
- ...…
- ISO Environmental Management System Certificate
- ISO Occupational, Health and Safety Management System Certificate
- ISO Quality Management System Certificate
- Solar Thermal Utilization Golden Sun Certificate
- China Compulsory Certification (CCC)
- China Energy Conservation Product Certification (CECP)
- China Environmental Product Certificate
Strategic Partnership
Product Chain
PRODUCTION FACILITIES
10 Sets of Electric Furnaces for High Borosilicate Glass Tubes, over 1/4 of the total quantity in china.
Product Wide application: The tubes are with diameter ranging from Φ9mm to Φ160mm and wall thickness from 1mm to 5mm,The glass can be adapted to various products, like glass instrument tubes, domestic glass ware, glass rod, chemical tubes, medium-high temperature Solar thermal tubes, rough solar vacuum tubes;
Process Flow
Test Machines
Export Experience
Our products have been widely exported to many countries, like Vietnam, India, Mexico, Syria, Korea, Dubai, Etc. we are serving the top brands in solar water heaters for each country. Our yearly export quantity is 600 containers.
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