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Heat Pipe Science and Technology, An International Journal

ISSN Imprimir: 2151-7975
ISSN On-line: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.2013007642
pages 105-117

THERMAL PERFORMANCE AND DEVELOPMENT OF A DUAL EVAPORATOR LOOP HEAT PIPE

Roger R. Riehl
National Institute for Space Research INPE/DMC, São José dos Campos, SP Brazil, 12227-010

RESUMO

Thermal control achieved by passive devices such as heat pipes and loop heat pipes (LHPs) has gained attention not only for aerospace applications, but also for several terrestrial uses such as mainframe cooling, defense, and military equipment. In some cases, the combination of heat pipes and LHPs is necessary and complex configurations are required. One of the applicable devices for complex operations is related to multiple evaporator LHPs, which present two or more parallel evaporators sharing the same transport lines and condenser. Such devices are desirable when a large thermal footprint is required but the use of several independent units is problematic. Even though multiple evaporator LHPs have been already investigated in the past, several issues regarding their operational limits are still not well understood. In order to improve the understanding of their thermal behavior, this paper presents an investigation on the operation of a dual evaporator LHP, having each evaporator connected to a different heat source but sharing the same transport lines and condenser, using polyethylene as primary wick structure and acetone as the working fluid. The experimental results show that both evaporators are able to transport the applied heat to their evaporators even when each heat source presents different heat loads. When both evaporators are submitted to the same heat load, one will control the entire loop's operation temperature as the corresponding compensation chamber temperature is lower than the other. From the obtained results, it is possible to conclude that this configuration presents useful features for the sustainable thermal control on many applications.