Title: Numerical sensitivity study of transient surface convection during night cooling
Authors: Leenknegt, Sarah ×
Wagemakers, Rolf
Bosschaerts, Walter
Saelens, Dirk #
Issue Date: Jul-2012
Publisher: Elsevier Sequoia S.A.
Series Title: Energy and Buildings vol:53 pages:85-95
Abstract: The energy performance of night cooling depends largely on the convective heat exchange between thermal mass
and room air. This is assessed with BES models, although they have an inaccurate treatment of surface convection
by using surface-averaged values for the convective heat transfer coefficient, assuming perfectly mixed air as well
as simplified dynamical behaviour. Therefore, a clear insight in the local and transient behaviour of the air-mass
system during night ventilation is essential. This is studied here through transient 2D CFD simulations including
conjugate heat transfer. A discussion of the transient flow development and resulting surface convection of one
case is combined with a sensitivity study. This study analyzes the influence of eight modelling choices, namely
discretisation, near wall treatment, simulation time step, turbulence model, conjugate heat transfer, radiation, inlet
and outlet location and geometry. It was found that the convective surface heat flux during night cooling can vary
greatly over time. This transient behaviour is therefore of great importance for the simulation of buildings with
night ventilation, as well as for the design of night ventilation systems. The results are nuanced by the influence of
different modelling choices on flow development.
ISSN: 0378-7788
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Building Physics Section
× corresponding author
# (joint) last author

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