The high-temperature heat pipe is a highly effective heat transfer element through heat exchange due to phase-change of the working medium

namely internal alkaline metal.A high-temperature heat pipe used in solar energy receiver of dish-type thermal power-generating system has been analysed

and a high-termperature heat pipe with composite wick being designed.The structure of composite wick is made up of V-shaped grooves covered with metal fibre felts.The isothermal and heat-conducting performance of a sodium heat pipe with composite wick have been tested under various power input and different inclined angles.Test proves that the axial and circumferential temperature difference of half circle heated high-temperature heat pipe both are higher than that of whole circle heated one

but the equivalent coefficient of heat conductivity being lower;the half circle heated heat pipe with inclined angle of 0~90° can stably work

having good isothermal and heat-conducting performance

the effect of inclined angle being not noticeable.