Heat Pipe Solar Collector

No hot water in winter? Excessive energy consumption in summer? Time to upgrade your heat-collection system!
In extremely cold regions traditional vacuum tubes may crack and cease to function below –10 °C. In commercial settings—such as hotels or schools—peak demand for hot water frequently outpaces supply. Meanwhile, maintenance headaches persist: leaks require shutdowns and can cause annual losses amounting to tens of thousands of yuan.

Enter the Heat Pipe Solar Collector. This solar thermal device is highly efficient and remarkably stable. Its core lies in a sealed “heat pipe” that contains a special working fluid. Solar radiation is captured by the selective-absorption coating inside the vacuum tube and converted into heat. This heat causes the working fluid to vaporize rapidly, the vapor ascends to the condenser end at the top of the pipe, transfers its heat to water in the storage tank, and then condenses and returns to complete the cycle. The process repeats continuously, enabling rapid heat transfer. Key strengths of this system include fast startup, high thermal efficiency, strong frost resistance, and importantly, the failure of a single tube does not compromise the overall operation. Consequently, this technology finds broad application in domestic hot-water supply, space-heating, and industrial pre-heating.

1. Key Product Advantages

(1) Ultra-High Heat Collection Performance
Using D-DOS high-performance selective absorption coating, the solar absorptance reaches ≥ 95% while infrared emissivity is ≤ 5%.
(2) High-Efficiency Heat Pipe, Stable & Reliable Heat Conversion
The core heat pipe is filled with a special fluid; once heated it vaporizes instantly and ascends to the condenser, where it efficiently releases heat. Compared to ordinary direct-flow collectors, the heat-pipe design yields far greater heat-transfer efficiency, faster startup, and minimal heat loss—even under weak sunlight conditions the system remains effective.
(3) Adapted for Extreme Environments, Year-Round Reliable Operation
Frost-resistant and ultra-cold-tolerant: the heat pipe can start at temperatures ≤ 30 °C and shows no freeze damage down to –25 °C. In fact, it remains operational even in extreme cold regions as low as –50 °C. On cloudy days it can still collect diffuse solar radiation thanks to the high-efficiency design, thereby avoiding the “shutdown” phenomenon common in conventional solar collectors under overcast conditions.
(4) Robust Structure for Harsh Weather
High-strength glass tubes can withstand hail with a diameter of up to 25 mm, and the overall structure reduces wind-load impact, ensuring system safety under adverse weather.
(5) Pressure-Safe Design, Lower Maintenance Cost
There is no direct contact between the collector tubes and the header manifold, eliminating leakage risk. A single damaged tube does not impair the whole system; localized repair is possible without system shutdown. The condenser end of the heat pipe resists scaling, substantially extending service life.
(6) Flexible Installation & Seamless Building Integration
Installation is not constrained by angle: tubes can be mounted horizontally, vertically or at any tilt. This flexibility allows perfect adaptation to complex rooflines and building facades, enabling one-integrated design between building and collector.

2. Working Principle

(1) Solar Energy Conversion
Sunlight penetrates the high-transmittance glass tube (transmittance ≥ 0.89) and is absorbed by the selective coating, converting it into heat.
(2) Phase-Change Heat Transfer
The heat moves through the aluminium fin assembly to the evaporation section of the heat pipe, where the working fluid rapidly vaporizes and rises to the condenser region.
(3) Heat Delivery
In the condenser section, a heat-conducting block transfers thermal energy from the vapor to the medium in the header manifold (which may be water, heat-transfer oil, etc.).
(4) Continuous Cycle
After releasing heat, the working fluid condenses and returns via gravity to the evaporation section, completing the loop and enabling continuous heat transmission.

3. Application Scenarios

Domestic hot-water supply, swimming-pool heating, and space-heating applications

Hotels, hospitals, schools with high-volume hot-water and heating demands

Industrial process heating and agricultural applications such as livestock water heating or farm-building heating

4. Additional Product Highlights

High-performance Heat Pipe: The internal mesh-wick liquid-return structure affords large heat-transfer power and a service life of up to 15 years.

High-Borosilicate Glass: With transmittance ≥ 0.92, outstanding impact resistance, rapid cooling/heating resilience, and temperature-differential endurance up to 270 °C.

D-DOS Selective Absorption Coating: Uniformly applied, resistant to high temperatures and degradation, delivering sustained high efficiency.

Insulation Layer: Made of high-density, closed-cell polyurethane foam—excellent heat-lock performance.

Casing: Premium aluminium or galvanized steel shell with electrostatic powder-coating to resist corrosion and weathering.