High heat efficiency Heat Pipe Vacuum tube

Group Solar Vacuum Tube
PriceUS $6-10 / set
Min. Order 1000 set
Terms of Payment all
Update Time 2014-01-21
Item specifics
TypeSolar Water Heater Parts
Suitable forheat pipe solar collector and pressure solar water heater
Product Description

   Heat Pipe Vacuum tube Technical Parameters


General Parameters

Heat Pipe Parameters


 Φ47X1500mm,  Φ58X1800mm

Heat transfer substance

mixer of some inorganic elements

Glass material

High borosilicate glass 3.3

Heat conducting wise

from liquid to gas and corpuscles

Wall thickness


Application temperature

-40 ~ 400oC

Diameter of condensor


Axial thermal conductivity

27.2 MW/M2

Vacuum tightness

less than 5*10-3Pa

Radial thermal conductivity

145 KW/M2

Absorber material

Aluminum fin

Heat transfer efficiency

≥ 95%

Absorptive Coating


Equivalent heat conductivity

6000-15000 times of pure silver

Absorption coefficient


Duration of element

≥ 15 years

Emission coefficient


Stagnation situation

No pipe crack

Hail resistance


Heat loss

Fast no heat resistance

Start up temperature



Good compatibility with metal


Features of Heat Pipe Vacuum Tube:

Solar heat pipe vacuum tube, there is anti-freeze liquid as heat-transferring medium in heat pipe which is hollow inside evacuated, by this design the water never goes into glass vacuum tube so the tube will never be broken in extremely cold weather, efficiency generated by heat pipe vacuum tube is about 55% in summer and 42% in winter more than that of normal glass vacuum tube, this type is especially for pressurized solar water heating system.


Performance of Heat Pipe:

1). High Thermal Conductivity, Heat conductivity of heat pipe is much higher than the common metal, from the above table, we can see that because it transfers heat inside heat pipe by gas and liquid phase, heat resistance is very small, so the axial heat conductivity is very high, while the radial heat conductivity is general.


2). Good Isothermal Performance, When heat pipe is working, the working fluid temperature inside it is saturation, the saturated working fluid temperature is the same, but it will absorb or release a lot of heat, therefore, heat pipe can transfer much heat under isothermal circumstances theoretically, whose outside behavior is the isothermal performance of heat pipe which is very good. The axial temperature of heat pipe is almost the same.


3). Reversibility of Heat Flow, a heat pipe with wick, if only the capilary force is enough, it will begin transfer heat, so that it makes the temperature of two ends tends to equal.


High heat efficiency Heat Pipe Vacuum tube


High heat efficiency Heat Pipe Vacuum tube


High heat efficiency Heat Pipe Vacuum tube