Evacuated tubes are the absorber of the solar water heater. They absorb solar energy converting it INTO heat for use in water heating. 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 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 exposing the tube to high temperatures. This "evacuation" of the gasses forms a vacuum, which is an important factor in the performance of the evacuated tubes. The vacuum in the evacuated glass tube is less than 5×10-3pa This can only be reached and maintained over a long period of time through a specialised evacuation process in production resulting in an almost total elimination of convection and conduction losses FROM the tube.

2. U Pipe

The Century Sun U pipe solar collector consists of 4 main components:

1.Cold tube
2.Hot tube
3.Heat transfer fin
4.Glass vacuum tube

In each vacuum tube there is a U pipe with direct flow-through that is connected to the header pipe inside manifold. This U pipe is seamed in an aluminum heat transfer fin in the interior of vacuum tube that transmits the heat FROM the interior tube to the U pipe.

Solar radiation permeates the outer glass tube and is captured on the outside of inner glass tube by highly selective sputter layer. The captured solar radiation is transmitted to flush-contact aluminum shield and then copper pipe filled with heat transfer fluid. The 360°aluminum heat transfer fin assures the fastest energy transfer

Advantage of vacuum tube U pipe

1. High temperature and high efficiency even in unfavorable condition.
2. Fast heat transfe
3. Big heat exchange capacity
4. Long service life, as absorbing coating is protected by vacuum
5. Maxim solar radiation angle
6. High annual output
7. Low assemble costs: Collector is pre-assembled and easy to mount
8. Tube can be replaced without drain the solar circuit

Heat pipe is heat transfer element in heat pipe solar collector and it is the core part of the whole colletor.Century Sun super heat pipe is a result of our extensive research and development.Each heat pipe is indivisually tested twice to ensure shortest start-up time and highest transfer power. 99.9% percent of our heat pipe survives aging test and freeze resistant test.We are able to design and manufacture heat pipe in any sizes and diameters by clients’ requestes.