Thermal Collecting Tubes.

The diagram shows the glass evacuated tube with the copper heat pipe, and contoured aluminium heat transfer fins. The heat pipe is simply inserted into the glass tube sandwich between the two aluminium fins. The fins are moulded to maximise contact area with both the heat pipe and the inside surface of the evacuated tube. This fin design greatly improves the heat transfer to the copper heat pipe and ultimately the water in the manifold. The heat pipe transfers heat to the manifold by a very simple method. The copper heat pipe is hollow and contains a patented inorganic non-toxic heat transfer liquid. The hollow centre of the heat pipe is a vacuum that at even temperatures of around 30°C the compound will vaporise; (See Collecting Tube Technical Views).