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  • Place of Origin: Zhejiang, China (Mainland)
  • Brand Name: sunny water
  • Model Number: Z-4
  • Type: Vacuum Solar Collector
  • Application: Water Heater
  • Pipe Material: Glass
  • material: brosilicate 3.3 glass
  • tube size: 58*1800mm
  • glass thickness: 1.6/2.0mm
  • tube coating: CU/AL/SS
  • material of heat pipe: copper
  • diameter of condenser: 14/24mm
  • heat pipe length: 1700mm
  • aluminum fin length: 1600mm
  • aluminum fin thickness: 0.14/0.18/0.23mm
  • LOGO print: offered

Packaging & Delivery

Packaging Details Carton; and follow your request
Delivery Time Shipped in 7 days after payment
Brief Introduction

What is a Heat Pipe?

Heat pipes might seem like a new concept, but you are probably using them every day and don't 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. In the ETC solar collectors they are used to transfer heat from within the evacuated tube up to the header pipe that is housed in the insulated manifold box.

Structure & Operation

The heat pipe design comprises a long hollow copper pipe with a larger diameter bulb at one end. A small amount of high purity water 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 behavior of the liquid inside. At sea level water boils at 100℃ / 212℉, 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 solar collectors have a boiling point of only around 30℃  (86), so when the heat pipe is heated above this temperature the water begins to vaporize (turn to steam). This vapor 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 to the cooler liquid circulating through the solar collector header pipe at the bulb (top), the vapor 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. We recommends an installation angle range of 20-80° to ensure optimal solar collector performance.

At room temperature 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.


Below is a picture of the movements for your reference:

Detailed Images
Data sheet
Flow type
Heat pipe
Heat pipe material
T2 copper
Heat pipe size
Top condenser: Ø14* 0.8mm;    Body: Ø8* 0.6mm
Tube diameter
φ47/1500mm or φ58/1800mm
Solar vaccum glass tube
High boron-silicon
Coating of absorber in glass tube
CU/SS-AL/N
fins around heat pipe
long Aluminum(1.6m)
Thickness of vacuum tube(mm)
1.6/2.0
Vacuum
P<5x10-3Pa
Heat transfer liquid
Water, Anti-freeze Fluid (Water-Glycol)
Max working temp
300C
Thermal expansion
3.3x106° C
Absorptance
> 92%(AM1.5)
Emittance
< 8% (80° C)
Heat Loss
< 0.8W / (m² ° C)
Maximum Strength
 0.8Mpa
Packing & Delivery
Application
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China (Mainland) | Trading Company
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3 Transactions 90,000+
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