Analysis of Conduction Heat Loss From a Parabolic Trough Solar Receiver with Active Vacuum by Direct Simulation Monte Carlo

Results are reported of a numerical analysis of conduction heat loss from a parabolic trough solar receiver with controlled pressure within the annular gap between the tubular absorber and the glass vacuum jacket. A direct simulation Monte Carlo (DSMC)model of rarefied gas within the annular gap is...

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Bibliographic Details
Published in:Numerical heat transfer. Part A, Applications Applications, 2012-09, Vol.62 (5), p.432-444
Main Authors: Roesle, Matthew, Good, Philipp, Coskun, Volkan, Steinfeld, Aldo
Format: Article
Language:English
Subjects:
Annular
Boundary conditions
Computer simulation
Conduction heating
Heat conductivity
Heat loss
Heat transfer
Mathematical models
Monte Carlo methods
Monte Carlo simulation
Radiation
Receivers
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Summary:Results are reported of a numerical analysis of conduction heat loss from a parabolic trough solar receiver with controlled pressure within the annular gap between the tubular absorber and the glass vacuum jacket. A direct simulation Monte Carlo (DSMC)model of rarefied gas within the annular gap is coupled to radiation heat transfer for directional- and spectral-dependent concentrated incident solar radiation. This modeling approach is valid for high Knudsen numbers, and consistently predicts slightly higher heat loss than a continuum model using slip boundary conditions in the range of pressures of interest around 1 Pa. 3-D simulations of axial flow through the annular gap predict higher gas conductance by the DSMC method than by slip flow models, with values converging as pressure increases.
ISSN:1040-7782
1521-0634
DOI:10.1080/10407782.2012.672868