a copper heat pipe is installed within the tube. The copper heat pipe transmits heat to its tip which is plugged into the collector's heat transfer manifold. As water runs through the manifold heat is transferred from the copper heat pipe to the water. The heat pipe is a very efficient means of transferring heat from within the evacuated tube to the water. The heat pipe is simply inserted into the glass tube.
The heat pipe transfers the heat to the manifold by a very simple method. The copper heat pipe is hollow and contains special liquid. The vapor rises to the tip (condenser) of the heat pipe where the heat is transferred to the water flowing through the manifold. The loss of heat causes the vapor to condense and flow back down the heat pipe where the process is once again repeated. This method of heat transfer is thousands of times more efficient than a solid copper rod. Heat is therefore very efficiently transferred from the glass evacuated tube to the water.

Evacuated heat pipe

Vacuum degree

Absorbing coefficient

Emission rate

Lowest temperature

Anti-wind

<5x10-3Pa

>94%

<6%

-50°C

30m/s