solar vacuum heat pipe /solar tube 1.Structure of tube :Cu/SS/ALN-AL/ALN 2. Higher heat efficiency: Advanced heat transfe
solar vacuum heat pipe /solar tubeA perfect combination of the vacuum tube and the heat pipe
Tube hail resistance | ≤25mm | Cold resistance | -40oC |
Watering temperature | 99oC | Stagnation temperature | 300oC |
1)Higher heat efficiency: Advanced heat transferring style of the heat pipe, excellent Selective absorbent coating and perfect combination with high vacuum heat preservation. 2)Wide applicable range: As the heat pipe has less heat capacity, it can be started Quickly even under cloudy fine day and collect heat effectively, It can work normally Even-30 below degree, As no water in the vacuum tube, It can effectively prevent lowing of heat efficiency due to frost cracking or scaling. 3)Each individual tube can work independently, and the whole machine can still work if individual tube is damaged. The service life of the heat pipe can be longer than 15 years. 4)The unique connection between the heat pipe and the vacuum tube can ensure both sealing and replace of damaged glass vacuumtube.
evacuated heat collection tube
Evacuated tube are the absorber of the solar water heater, This type of tube is
chosen for it's reliability, performance and low manufacturing cost
Each evacuated tube consists of two glass tubes 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 special selective coating (AL-N/AL)which features excellent solar radiation absorption 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 exposig the tube to high temperature
This "evacuation" of the gasses forms a vacuum which is an important factor in
the performance of the evacuated tubes
I High heat-collecting effciency: The vacuum magnetic-controlled sputtered aluminum-nitrogen-aluminum selective absorption coating has a solar absorptance≥ 0.93, a heat emittance≤ 6%, a low heat loss, and a good thermal-retention effect
II Good weather-resistanc: It has a good all-year thermal efficiency and is able to withstand the front impact by the hail of a dianmeter below 25mm and pressure 0.6Mpa
III Long service life: Ensures a service life of 15 years for the evacuated tube Item Measured Value Specification in Chinese state standard Ptance of the solar selective
absorbing coatings α≥ 0.931 α≥ 0.86(AM1.5)
Hemisphere emittance ε≤0.06 ε≤0.09(80 ±5ºC)
Solar radiance exposure
using sun as medium H ≤ 2.639MJ/m² H ≤ 3.8MJ/m²
Ation parameter using
air as medium Y ≥240 m ² ºC /Kw Y ≥175 m ²ºC /Kw Average heat loss coefficient ULT ≤ 0.78W/m 2 ºC ULT ≤ 0.9W/m 2ºC III Long service life: Ensures a service life of 15 years for the evacuated tube ItemMeasured ValueSpecification in Chinese state standard Ptance of the solar selective absorbing coatingsα≥ 0.931α≥ 0.86(AM1.5) Hemisphere emittanceε≤0.06ε≤0.09(80 ±5ºC) Solar radiance exposure using sun as mediumH ≤ 2.639MJ/m²H ≤ 3.8MJ/m² Ation parameter using air as mediumY ≥240 m ² ºC /KwY ≥175 m ²ºC /Kw Average heat loss coefficientULT ≤ 0.78W/m 2 ºCULT ≤ 0.9W/m 2ºC
vacuum tube/solar vacuum heat pipe for water heating
