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Operating Characteristics of Multiple Evaporators and Multiple Condensers Loop Heat Pipe with Polytetrafluoroethylene Wicks

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DOI: 10.4236/jectc.2014.41003    4,917 Downloads   7,151 Views   Citations

ABSTRACT

This paper presents fabrication and testing of a multiple-evaporator and multiple-condenser loop heat pipe (MLHP) with polytetrafluoroethylene (PTFE) porous media as wicks. The MLHP has two evaporators and two condensers in a loop heat pipe in order to adapt to various changes of thermal condition in spacecraft. The PTFE porous media was used as the primary wicks to reduce heat leak from evaporators to compensation chambers. The tests were conducted under an atmospheric condition. In the tests that heat loads are applied to both evaporators, the MLHP was stably operated as with a LHP with a single evaporator and a single condenser. The relation between the sink temperature and the thermal resistance was experimentally evaluated. In the test with the heat load to one evaporator, the heat transfer from the heated evaporator to the unheated evaporator was confirmed. In the heat load switching test, in which the heat load is switched from one evaporator to another evaporator repeatedly, the MLHP could be stably operated. The loop operation with the large temperature difference between the heat sinks was also tested. From this result, the stable operation of the MLHP in the various conditions was demonstrated. It was also found that a flow regulator which prevents the uncondensed vapor from the condensers is required at the inlet of the common liquid line when one condenser has higher temperature and cannot condense the vapor in it.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Okutani, S. , Nagano, H. , Okazaki, S. , Ogawa, H. and Nagai, H. (2014) Operating Characteristics of Multiple Evaporators and Multiple Condensers Loop Heat Pipe with Polytetrafluoroethylene Wicks. Journal of Electronics Cooling and Thermal Control, 4, 22-32. doi: 10.4236/jectc.2014.41003.

References

[1] Ku, J. (1999) Operating Characteristics of Loop Heat Pipes. Proceedings of the 29th International Conference on Environmental Systems, Paper No.1999-01-2007.
[2] Maydanik, Y.F. (2005) Review Loop Heat Pipes. Applied Thermal Engineering, 25, 635-657.
http://dx.doi.org/10.1016/j.applthermaleng.2004.07.010
[3] Baker, C. and Grob, E. (2001) System Accommodation of Propylene Loop Heat Pipes for the Geoscience Laser Altimeter System (GLAS) Instrument. Proceedings of the 31st International Conference on Environmental Systems, SAE Paper No. 2001-01-2263.
[4] Choi, M. (2004) Thermal Vacuum/Balance Test Results of Swift BAT with Loop Heat Pipe Thermal System. Proceedings of the 2nd IECEC, AIAA Paper No. 2004-5683.
[5] Nagai, H. and Ueno, S. (2005) Performance Evaluation of Doublecondenser Loop Heat Pipe onboard Monitor of All-Sky X-Ray Image (MAXI) in Thermal Vacuum Testing. Proceedings of the 35th International Conference on Environmental Systems, SAE Paper No. 2005-01-2939.
[6] Bienert, W.B., Wolf, D.A., Nikitkin, M.N., Maydanik, Y.F., Fershtater, Y., Vershinin, S. and Gottschlich, J.M. (1997) The Proof-Of-Feasibility of Multiple Evaporator Loop Heat Pipes. Proceedings of the Sixth European Symposium on Space Environmental Control Systems, 393-398.
[7] Ku, J., Ottenstein, L., Douglas, D., Pauken, M. and Birur, G. (2005) Miniature Loop Heat Pipe with Multiple Evaporators for Thermal Control of Small Spacecraft. Government Microcircuit Applications and Critical Technology Conference, Paper No.183.
[8] Nagano, H. and Ku, J. (2007) Capillary Limit of a Multiple-Evaporator and Multiple-Condenser Miniature Loop Heat Pipe. Journal of Thermophysics and Heat Transfer, 21, 694-701.
http://dx.doi.org/10.2514/1.26151
[9] Nagano, H., Fukuyoshi, F., Ogawa, H. and Nagai, H. (2011) Development of an Experimental Small Loop Heat Pipe with Polytetrafluoroethylene Wicks. Journal of Thermophysics and Heat Transfer, 25, 547-552.
http://dx.doi.org/10.2514/1.T3614
[10] Nagano, H., Fukuyoshi, F., Nagai, H. and Ogawa, H. (2008) Study on Thermal Characteristics of a Small Loop Heat Pipe. Journal of Thermal Science and Technology, 3, 355-367.
http://dx.doi.org/10.1299/jtst.3.355
[11] Nishikawara, M., Nagano, H. and Kaya, T. (2013) Transient Thermo-Fluid Modeling of Loop Heat Pipes and Experimental Validation. Journal of Thermophysics and Heat Transfer, 27, 641-647.
http://dx.doi.org/10.2514/1.T3888
[12] Kaya, T. and Hoang, T.T. (1999) Mathematical Modeling of Loop Heat Pipes and Experimental Validation. Journal of Thermophysics and Heat Transfer, 13, 314-320.
http://dx.doi.org/10.2514/2.6461

  
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