Loop heat pipe

Figure 5. Micro - loop heat pipe - the electronic microchip cooler, [21].

Such types of MHP evaporators are also convenient for micro loop heat pipes. Figure 5, when it is necessary to ensure the heat dissipation outside the chip. 

In this paper we consider SHP as a combination of a loop heat pipe (LHP) and ammonia/ (active carbon fiber -I- chemicals) solid sorption cooler. Such system extends the limits of two-phase thermal control and ensures successful mode of electronic components cooling even in very harsh environmental conditions (ambient temperature 40 °C, or more) and ensures a deep cooling of space sensors down to the triple point of the hydrogen. 

The considered experimented set - up can be applied in two different ways. The first one is to use is as a semiconductor sensor cooler with low heat dissipation to cool the sensor down to the ambient temperature. It is interesting to be applied in cryogenic range of temperatures. The second option is related with the cooler for high energy dissipation devices (for example laser diode cooler). The first set of experiments was performed with sorption heat pipe and ammonia as a working fluid to demonstrate the basic possibility to decrease the temperature of the heat loaded wall to compare with the temperature of this wall in the phase of loop heat pipe cooling mode. 

Significant heat transfer enhancement is obtained in the sorption heat pipe to compare with a conventional loop heat pipe for the same fluid (ammonia) and evaporator dimensions during operation of a sorption bloc. 

L.L.Vasiliev, A.A. Antukh, L.L. Vasiliev Jr. Electronic cooling system with a loop heat pipe and solid sorption cooler in Proceedings of the 11 th IHPC, Tokyo, September 12-16, 1999, Japan, Preprint Vol. 1, pp. 54-60. 

Yu. Maidanik, Yu. Fershtater, V. Pastukhov " Some results of Development of Loop Heat Pipes" in Proceedings of the CPL-96 Workshop on Capillary pumped Two-phase Loops, Noordwijk, Netherlands, 1996. ... 

V. Kiseev, N. Pogorelov, A Study of Loop Heat Pipes Thermal Resistance , in Proceedings of the 11 IHPC, September 21-25, 1997, Stuttgart, Germany, Sessions Al, A2,p. 45. 

Rosenfeld, J.H., Anderson, W.G., North, M.T., Improved High Heat Flux Loop Heat Pipes using bidisperse evaporators wicks, Proceedings of l(f IHPC, September 1997, Stuttgart. 

H.F. Smirnov and K.A. Goncharov, Physical and Mathematical modelling of loop heat pipes evaporators. Proceedings of 77 IHPC, September 1999, Tokyo. 

Altman, E.I., Mukminova, M.Ja., Smirnov, H.F., Loop Heat Pipe Evaporators Theoretical Analysis, Proceedings of I2 IHPC, May 2002, Moscow. 

Maidanik, Yu.F., Fershtater, Yu.G., Pastukhov, V.G., Loop Heat Pipes Working out. Investigations, Engineering calculations elements. The Scientific reports of USSR Academy of Sciences, Ural Branch, 1989, Sverdlovsk. 

While advanced two-phase technology such as capillary pumped loops and loop heat pipes offer major advantages over traditional thermal control technology, it is clear that this technology alone will not meet the needs of all future scientific spacecraft... . 

Maydanik, Yu.F. (2005). Loop heat pipes. Review article. Applied Thermal Engineering, Vol. 25, No. 5-6, pp. 635-657, April. 

Park, Y.J., Jun, S., Kim, S., Lee, D.H. 2010. Design optimization of a loop heat pipe to cool a lithium ion battery onboard a military aircraft. 

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