Operating principles of Loop Heat Pipe

Operating principles of Loop Heat Pipe

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Loop Heat Pipe (LHP) is a two-phase heat transfer device that consists of an evaporator, a reservoir, a condenser, and vapor and liquid transport lines. 

As heat is applied to the evaporator, liquid is vaporized and the porous wick in the evaporator developed capillary forces to push the vapor though the vapor line to the condenser. Vapor condenses in the condenser and the capillary forces continue to push liquid back to the evaporator. The two-phase reservoir stores excess liquid and controls the operating temperature of the loop.

LHP utilizes the evaporation and condensation of a working fluid to transfer heat, and the capillary forces developed in a fine porous wick to circulate the fluid.

Advantages of Loop Heat Pipe

Excellent Heat Transfer Performance
LHP, which utilizes latent heat of vaporization for heat transfer, has a high heat transfer capacity. It is the best solution for thermal management of high heat flux devices
Passive Heat Transfer
The fluid is circulated by the capillary force developed in fine porous wicks, with high energy-saving efficiency and reliability
Anti Gravity
The capillary force provided by the fine porous wicks enable the loop heat pipe to have anti gravity capability, thus the loop heat pipe can work in any installation position
Flexible Layout
The heat source and heat sink are connected through small diameter vapor and liquid lines, which can be bent freely without limitation
Temperature Homogeneity
The loop heat pipe is the best solution to replace the water cool system. Because the thermal resistance of the LHP is small, and the temperature homogeneity is excellent
Long Distance Heat Transfer
The capillary force provided by the porous wick enable the heat transfer distance to reach hundreds of meters