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Heat Pipe Science and Technology, An International Journal

年間 4 号発行

ISSN 印刷: 2151-7975

ISSN オンライン: 2151-7991

RELATIVE THERMAL PERFORMANCE OF SUPERCRITICAL CO2, H2O, N2, AND He CHARGED CLOSED-LOOP THERMOSYPHON-TYPE HEAT PIPES

巻 3, 発行 2-4, 2012, pp. 169-185
DOI: 10.1615/HeatPipeScieTech.2013005932
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要約

Compared with water, CO2's relatively high density at high temperatures and pressures makes it significantly more efficient as a working fluid for trans-critical power generation, and also, much smaller physically sized pipes and turbo machinery can be used. As such this paper considers the use of CO2 as the working fluid for closed and closed-loop two-phase thermosyphon-type heat pipes. It also compares the relative performance of CO2 compared with superheated and supercritical water, helium, nitrogen, and sodium. A time-dependent (transient) computer simulation program of a typical closed-loop thermosyphon has been developed. The simulation model requires the disctretization of the loop into a series of control volumes, the application of the equations of change (conservation of mass, momentum, and energy) to each control volume, and the solution of the set of nonlinear partial differential equations so generated using an explicit numerical formulation technique and appropriate properties functions and equations of state, for closure. The assumptions made include one-dimensional and quasi-equilibrium flow conditions and upwind differencing. The results of this analysis are collated in a tabular and graphical form thereby allowing the relative performance and scaling characteristics of the various working fluids to be readily established. It is also envisaged that such information will be useful in the design of high performance heat transfer systems, especially in the light of a greater awareness of and the everincreasing imperative for sustainable and pollution-free energy and heat transfer solutions.

によって引用された
  1. Reay D.A., Kew P.A., McGlen R.J., Heat pipe components and materials, in Heat Pipes, 2014. Crossref

  2. de Haan Victor-O., Gommers René, Rowe J. Michael, Thermodynamic calculations of a two-phase thermosyphon loop for cold neutron sources, Cryogenics, 85, 2017. Crossref

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