Heat pipe, heat pipe system, and related method for long distance

A heat pipe system for long distance through which heat laden vapor can be transferred from a heat source to a heat sink without a return pipe of the liquid condensate, the system comprising:

• an evaporator at an evaporating unit which is kept supplied with a working liquid from an external source via an evaporating liquid supply system, wherein the working liquid undergoes a phase change to create latent heat laden vapor by receiving heat from a heat source outside;
• a conduit of a transferring unit for connecting the evaporating unit and the condensing unit, and which delivers heat laden vapor over a distance to a condenser;
• the condenser at the condensing unit which discharges the heat to an external heat sink and in the process creates a liquid condensate of the working liquid and discharges the liquid condensate externally via a condensation working fluid discharging unit;
• a decompression vacuum device or vacuum pump for maintaining an internal pressure of the conduit of a transferring unit;
• and
• a sensor unit for sensing changes in at least one of a temperature, pressure, and water level in each of the evaporator, the condenser, and working liquid discharge units installed along the conduit of the transferring unit, and for sending signals to the decompression vacuum device or vacuum pump, the evaporating liquid supply unit, the condensation working fluid discharging unit and the working liquid discharge units installed at points along conduit of the transferring unit.