Browse Publications Technical Papers 2007-01-3237
2007-07-09

Development of LHP with Low Control Power 2007-01-3237

Using Loop Heat Pipes (LHPs) for controlling the temperature of the source of heat has been considered for many applications. However, traditional LHPs can require significant amounts of power for source temperature control.
A number of techniques have been identified and implemented to reduce control power requirements. One of the very first design approaches was to thermally couple the liquid line bringing subcooled liquid from the condenser to the vapor line entering the condenser with a number of “coupling blocks”. In another application, a variable conductance heat pipe (VCHP) was used to couple the liquid line to the LHP evaporator.
A third generation approach has been developed that offers even further reductions in control power. The paper discusses earlier generations of control power reduction approaches with their advantages and disadvantages. It also describes the third generation of the approach, which is currently in manufacturing.

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