Home > Products > Solar Vacuum Tube > High Quolity Heat Sensitive Coating Heat Pipe Solar Vacuum Tube
High Quolity Heat Sensitive Coating Heat Pipe Solar Vacuum Tube
- 25000 Piece / Pieces per Month
- Shanghai/Ningbo
- T/T
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Product Details
Place of Origin: | Zhejiang, China | Brand Name: | Sanneng | Model Number: | SN-HP58/1800 |
Product Description
China Product Heat Sensitive Coating Heat Pipe Solar Vacuum Tube
Technical Data of Heat Pipe Solar Vacuun Tube
Vacuum tube size | Φ58*1800mm / Φ47*1800mm |
Vacuum tube material | High borosilicate glass 3.3 |
Selective coating | Cu/SS-ALN(H)/SS-ALN(L)/ALN |
Heat pipe diameter | Condenser Φ14/ 24mm, body Φ8mm |
Heat pipe material | TU1 copper |
Heat conductor | Aluminum wrapping |
Tube sealing material | Silicon plug with stainless plate |
Vacuum degree | ≤4*10-3Pa |
Absorption coefficient | ≥90% |
Emission coefficient | ≤7.5% |
Heat transfer efficiency | ≥ 95% |
Heat transfer coefficient | (1.6~2)*104 w/m.k |
Heat transfer power | 150 - 180W |
Heat resistance | 0.01 - 0.02°C/W |
Isotherm | ≤ 2 °C |
Start up temperature | ≤ 25°C |
Start up rate | 30 s |
Heat conducting wise | from liquid to gas and corpuscles |
Working temperature | (-) 40 ~ 260°C |
Axial thermal conductivity | 27.2 MW/M2 |
Radial thermal conductivity | 145 KW/M |
Equivalent heat conductivity | 6000-15000 times |
Working angle | 15 ~90° |
Hail resistance | Φ25mm |
Duration of element | ≥ 15 years |
Model Number | Size/ MM | Container Loading Qty (PCS) | ||
|
| 20GP | 40GP | 40HQ |
SN-HP47/1800 | Φ47*1800 | 4256 | 8511 | 10335 |
SN-HP58/1800 | Φ58*1800 | 2547 | 5094 | 6186 |
1 Product Describtion about Solar Vacuun Tube with Heat Pipe
Heat pipes might seem like a new concept, but you are probably using them every day and do
not even know it. Laptop computers often using small heat pipes to conduct heat away from the
CPU, and air-conditioning system commonly use heat pipes for heat conduction.
Solar heat pipe tubes are the heart of the SANENG heat pipe solar collector, responsible for
absorbing sunlight and converting it into usable heat. In the SANENG heat pipe solar collector
they are used to transfer heat from within the evacuated tube up to the header pipe that is
housed in the insulated manifold box.
2 Features of SANENG Solar Heat Pipe Vacuum Tube
Structure & Operation
The SANENG heat pipe design comprises a long hollow copper pipe with a larger diameter
condensor welded at one end. A small amount of high purity water and special additives is
added into the heat pipe and then heated to high temperatures to evacuate any air from within
the space, the result is a vacuum, similar to the space between the glass walls of the evacuated
tube.
In a heat pipe, the vacuum is not used for insulation, but rather to alter the behaviour of the
liquid inside. At sea level water boils at 100oC / 212oF, but if you climb to the top of a mountain the boiling temperature will be lower. This is due to the difference in air pressure, and a vacuum
is a state of very low 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 SANENG solar collectors have a boiling point of only around 25oC, so
when the heat pipe is heated above this temperature the water begins to vaporize (turn to steam). This vapour rapidly rises to the top of the heat pipe and carries with it large amounts of heat. As
the heat is off-loaded to the cooler liquid circulating through the solar collector header pipe at the
pipe top, the vapour condenses to form a liquid (water) and returns to the bottom of the heat
pipe to once again repeat the cycle.
During the heat pipe operation cycle the flow of condensed liquid (water) to the bottom relies
on gravity and for this reason heat pipes of this design do not work when horizontal and have
reduced output when vertical. SANENG recommends an installation angle range of 20-80o to
ensure optimal solar collector performance.
In vacuum space the water in the heat pipe forms a small ball shape. 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 hard metal.
While is sounds simple, making a quality heat pipe requires more than 20 manufacturing steps
with strict quality control.
Performance
The job of the heat pipes in the evacuated tubes is to rapidly transfer away the heat. The heat
pipe capacitymust therefore be greater than the evacuated tube's maximum output to avoid a
bottle neck in the heat transfer chain. SANENG heat pipes have an average heat transfer capacity of >110Watts. The maximum heat output of an SANENG vacuum tube is around 65Watts.
The SANENG heat pipe also features a large head condenser that provides sufficient surface area
for optimal heat transfer.
Longevity
Material quality and cleaning are extremely important to the creation of a good quality heat
pipe.The purity of the copper itself must also be very high, containing only trace amounts of
oxygen and other impurities. If the copper contains too many impurities, they will leach out into
the vacuum over time forming a pocket of air in the top of the heat pipe. This has the effect of
moving the heat pipe's hottest point downward away from the bulb where the heat transfer is
required to occur.
SANENG produces its own heat pipes in an ISO9001:2008 certified facility, carefully controlling
and quality checking each aspect of the production process.
Each heat pipe is tested for heat transfer performance and exposed to 300°C temperatures prior
to being approved for use, for this reason the copper heat pipes are relatively soft. Heat pipes that are very stiff have not been exposed to such strictly quality testing, and may form an air pocket
in the top over time, thus greatly reducing heat transfer performance.
Freez Protection
Although the heat pipe inside is a vacuum and the boiling point has been reduced to 25C, the
freezing point is still the same 0C as water at sea level. Since the heat pipe is located within the
vacuum insulated glass tube, night temperatures as low as -40C will not cause the heat pipe to
freeze. The water used in heat pipes still freezes in special cold conditions, but it freezes in a
controlled way that does not cause swelling of the copper pipe.
3 Advantages of heat pipe solar collector
Comparing with vacuum tube solar collector
1. High efficient heat pipe tubes;
2. High pressure and anti-freezing collector;
3. Less heat loss for closed loop circulation;
4. No risk of tube breaking from thermal shock;
5. No risky of tube breaking from water freezing.
6. No system drainage even though one or several tubes are broken;
Comparing with flat panel solar collector
1. Higher efficiency collector, much lower heat loss with vacuum insulation;
2. Super anti-freezing performance for heat pipes in cold weather condition;
3. No system drainage even though one or several tubes are broken;
4. More convenient in system parts carrying and installation;
4 Service of Haining Sanneng Solar Water Heater Co., Ltd.
Fast response: Your inquiry will be replied within 24 hours via e-mail or online messenger;
Technical support: You have more than 10 years experience from SANENG SOLAR for product suggestion, installation guidance, market analysis, etc.
OEM & ODM: We welcome OEM & ODM requirements for solar collector, storage tank,
installation frame, and even for some outsourcing equipments;
Sample checking: In spite of quality control in production, samples will be selected and
installed to check prior to delivery;
Minimum order quantity: We offer sample sample manufacturing for customers to check
SANENG quality and service;
Shipping service: SANENG company offers to arrange goods shipment to abroad ocean port or inland site, and if necessary to make goods insurance, customs clearance, etc;
Import certificates: SANENG company offers to make Certificate Origin CO, FORM A, FORM E, FORM F, customs certification, etc.
5 Remarks
1.Lead-time: 7-15 working days after receiving payment
2.Payment Term: T/T, L/C, Western Union
3. Warranty: 5 Years for the full system, 15 Years for the vacuum tube, and 1 year for accessories
4. Trade Term: FOB, CFR and CIF
5. Contact: Ms. eva he Mobile: (00)86-13511390503 Skype: eva201423
Contact Us
- Haining Sanneng Solar Water Heater Co., Ltd.
- Contact namejunjie Wang
- Phone0086-573-87881860
- AddressNo. 25, Weidong Team, Longlian Village, Yuanhua Town, Haining
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