Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31106
Feasibility Study on Designing a Flat Loop Heat Pipe (LHP) to Recover the Heat from Exhaust of a Gas Turbine

Authors: M.H.Ghaffari


A theoretical study is conducted to design and explore the effect of different parameters such as heat loads, the tube size of piping system, wick thickness, porosity and hole size on the performance and capability of a Loop Heat Pipe(LHP). This paper presents a steady state model that describes the different phenomena inside a LHP. Loop Heat Pipes(LHPs) are two-phase heat transfer devices with capillary pumping of a working fluid. By their original design comparing with heat pipes and special properties of the capillary structure, they-re capable of transferring heat efficiency for distances up to several meters at any orientation in the gravity field, or to several meters in a horizontal position. This theoretical model is described by different relations to satisfy important limits such as capillary and nucleate boiling. An algorithm is developed to predict the size of the LHP satisfying the limitations mentioned above for a wide range of applied loads. Finally, to assess and evaluate the algorithm and all the relations considered, we have used to design a new kind of LHP to recover the heat from the exhaust of an actual Gas Turbine. By finding the results, it showed that we can use the LHP as a very high efficient device to recover the heat even in high amount of loads(exhaust of a gas turbine). The sizes of all parts of the LHP were obtained using the developed algorithm.

Keywords: Heat Transfer, loop heat pipe, Design Algorithm, Head Load, Liquid-Vapor Interface

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1778


[1] M. Hamdan, F. M. Gerner, H. T. Henderson, "Steady State Model of a Loop Heat Pipe(LHP) with Coherent Porous Silicon(CPS) Wick in the Evaporator", Int. J. Heat Mass Transfer, Vol. 35, (2003).
[2] Yu.F. Maydanik, "Loop heat pipes", Institute of Thermal Physics, Ural Branch of the Russian Academy of Sciences, Amundsen St. 106,Ekaterinburg 620016, Russia, Applied Thermal Engineering 25 (2005) 635-657.
[3] Faghri. A "Heat pipe science & Technology", Taylor and Francis publication (1984).
[4] Po-Ya Abdel Chuang,(2003), "An Improved steady state model of Loop Heat Pipes based on Experimental and Theoretical Analysis", PHD Thesis, Mechanical and Nuclear Engineering Department, The Pennsylvania State University, Pennsylvania.
[5] G. Van Wylen, R. Sonntag, C. Borgnakke, "Fundamentals of Classical Thermodynamics", 4th Edition, John Wiley & Sons, INC., New York, (1998).
[6] M. Ebrahimi, "Hand Book of Thermodynamic Tables", Koleyni Pub., Tehran, May (1985).
[7] D. Butler, T. Hoang, "The enhanced capillary pumped loop flight experiment: a prototype of the EOS platform thermal control system", AIAA Paper 91-1377, in: Proceedings of the 26th AIAA Thermophysics Conference, Honolulu, 1991.
[8] J. Ku, L. Ottenstein, D. Butler, "Performance of CAPL 2 flight experiment", SAE Paper 961432, in: Proceedings of the 26th International Conference on Environmental Systems, Monterey, CA, 1996.
[9] T. O-Connell, T. Hoang, J. Ku, "Investigation of power turn down transients in CAPL-1 flight experiment", AIAA Paper 95-2067, in: Proceedings of the 30th AIAA Thermophysics Conference, San Diego, CA, 1995.
[10] A.M. Kiper, T.D. Swanson, R. McIntosh, "Exploratory study of temperature oscillations related to transient operation of a capillary pumped loop heat pipe", in: Proceedings of the ASME National Heat Transfer Conference, Houston, 1988, pp. 353-359.
[11] K.R. Kolos, K.E. Herold, "Low frequency temperature and fluid oscillations in capillary pumped loops", AIAA Paper 97-3872, in: Proceedings of National Heat Transfer Conference, Baltimore, MD, 1997.
[12] V.Ya. Sasin, A.I. Zelenov, V.G. Zuev, E.Yu. Kotlyarov, "Mathematical Model of a Capillary Loop Heat Pipe with a Condenser-radiator", SAE Paper No. 901276, 1990.
[13] W.B. Bienert, D.A. Wolf. "Temperature control with loop heat pipes: analytical model and test results, in: Proceedings of the Ninth International Heat Pipe Conference (IHPC)", Albuquerque, NM, USA, 1995.
[14] T.T. Kaya and T.T. Hoang, "Mathematical modeling of loop heat pipes and experimental validation", Journal of Thermophysics and Heat Transfer 13 (3) (1999), pp. 314-320.