FIELD: energy.
SUBSTANCE: invention relates to heat engineering and can be used to transfer heat energy at vertical extended channels in systems of heat power engineering. Point of invention is following: circular controlled thermal siphon contains evaporator, condenser, pipe for transport steam pipe for condensed liquid, annular chamber with an annular nozzle in the evaporator, connected to the pipe with condensate, upon that there is circular metal filler micromesh in evaporator below the annular nozzle, a capacitor is connected with pipe for liquid through controlled valves, there is a siphon between the pipe for steam and condenser, and the output of the siphon is connected to the bottom of condenser surface containing condensed liquid. In the cover of the condenser there is a valve for incondensable gas of type of Majewski needle valve. For transmission the steam from the evaporator into transport zone of the pipe for steam one enters a coaxial insert with open ends in the evaporator at the level of the ring chamber.
EFFECT: increase thermodynamic efficiency of thermal siphon.