Feature

The heat-pipe is composed of heat-energy absorption unit and condenser unit, and is hollow  with the space inside evacuated.

Under the vacuum circumstance, the air pressure inside heat-pipe is very low, thus the medium can be evaporated easily when absorbing certain energy.

This vapour rapidly rises to the condenser zone and transfers heat, then becomes the liquid and returns to the bottom of the heat pipe since

the heat is lost. This process repeats again and again, so the solar energy is transferred continuously.