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SBIR/STTR

Miniature Loop Heat Pipe with Multiple Evaporators and Multiple Condensers, Phase II

Completed Technology Project

Project Introduction

Miniature Loop Heat Pipe with Multiple Evaporators and Multiple Condensers, Phase II
Loop Heat Pipe (LHP) is a high performance heat transport device using capillary forces to circulate the working fluid in a closed loop. Conventional LHPs usually have one capillary pump (evaporator) to acquire waste heat from a heat source. Recent efforts have focused the development of LHPs that contain two or more evaporators. Even though two-evaporator LHPs performed very well, the volume of each compensation chamber (CC) became much larger than that of the single-evaporator counterpart. The reason was that all but one CC would be liquid-filled during normal operation. The one that was not liquid-filled had to be large enough to accommodate the system liquid expansion at maximum temperature. As a result, LHPs with more than 3 evaporators were not feasible for practical applications simply because the CCs became prohibitively large. In the current research, the CCs of a multiple-evaporator LHP were capillarily-linked. In other words, the CCs always contained a mixture of liquid and vapor (two-phase), allowing the loop to operate with a much smaller fluid charge. Consequently the required CC volume was also reduced. More »

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