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Heat Pipe Solar Collector

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Evacuated heat pipe technology

● The evacuated tubes utilize the thermos flask principle, comprising two glass tubes with an evacuated gap to prevent heat loss.

● The inner glass tubes feature a highly selective absorber layer (AI/ALN), ensuring optimal energy yield.

● An aluminium heat transfer plate facilitates an efficient heat transfer medium system.

● Copper heat pipes effectively transfer the extracted heat.

● The manifold is insulated with rock wool and an aluminium lamination to minimize heat loss.

● The flow and return connections utilize compression ring fittings (Ø 22 mm), ensuring secure and easy installation of the pipework.

● The commonly used working fluid is water, suitable for operating temperatures ranging from -30 °C to 90 °C.


Heat pipes made in China
The evacuated heat pipe technology uses the maximum fraction of solar irradiation at minimum ambient temperatures of -30  °C and maximum operating temperatures to 90 °C.

Key benefits:
● High collector efficiency of medium temperature suitable for pressurized and non-pressurized solar thermal applications.
● Due to the rapid heat conductivity evacuated heat pipe collectors are suitable for solar thermal applications in cooler areas with low ambient temperatues.
● Well-known indestructibility of the evacuated heat pipe collectors according to DIN EN 12975-2.


Recommended application areas:
Hot water generation and heating support.


Product Characteristics

● The collectors are fully pre-assembled, resulting in short installation times.

● The modules have manageable sizes, allowing for high performance and quick, easy installation.

● The thermal insulation is highly efficient.

● The manifold allows for filling the flow and return pipes on either the left or right side.

● The collectors come in different widths and lengths, providing high flexibility.

● The system can operate in both pressurized and non-pressurized modes.

● The system can operate independently of the season, depending on the heat transfer medium.

● The thermal conductivity is rapid.

● The evacuated tubes have a high vacuum, resulting in a high energy yield and low heat loss.

● The system can operate in temperatures as low as -30 °C and as high as 90 °C.

● The two-loop system ensures good water quality and prevents freezing on cold days. It also allows for easy integration with other energy sources.




R1820R1824R1830
Dimension1970*1551*161mm1970*1851*161mm1970*2301*161mm
Gross area3.06 ㎡3.65 ㎡4.53 ㎡
Aperture area1.87 ㎡2.25 ㎡2.81 ㎡
Number of evacuated tube202430
Outer diameter / length of evacuated tubeφ58/1800mmφ58/1800mmφ58/1800mm
InsulationRock woolRock woolRock wool
Diameter of the condensing end of heat pipe24mm24mm24mm
Diameter of the horizontal copper pipe38mm38mm38mm
Efficiency based on aperture area, Solar Keymark EN1297574.5%74.5%74.5%
Annual collector energy yield under Solar Keymark, based on ISO 9806:2013  (at mean fluid temperature of 50℃, location Würzburg) kWh147817632188
Stagnation temperature267.6℃267.6℃267.6℃
Connetion diameter, mm222222
Allowed heat transfer mediumWater/glycolWater/glycolWater/glycol


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