The Effect Of A Baffle On The Heat Transfer In
Underground Auxiliary Ventilation Systems
Author(s)
S. M. Aminossadati & B. Ghasemi
Abstract
This paper presents a computational fluid dynamics simulation to examine the
effects of the baffle on the air flow field and the heat transfer rate in a space
located beneath a ventilation channel. The computational model consists of a
two-dimensional channel equipped with a thin baffle hanging from the top wall
and a cavity located underneath simulating the underground space. Air flows
trough the channel at a uniform velocity, c u , and temperature, c T . The cavity
base is assumed to be heated at a constant temperature, h T , while the vertical
walls of the cavity are well-insulated. The top wall of the channel is maintained
at a constant temperature, c T . The continuity, momentum and energy equations
are solved numerically using the control-volume approach to examine a
combination of natural and forced convection flows. The results show that even
though the existence of the baffle improves the cavity ventilation performance at
low Richardson numbers, it has a negative impact at high Richardson numbers.
Keywords: heat transfer, forced convection, underground ventilation, baffle.
1 Introduction
Nowadays, underground spaces are being utilised for a wide variety of purposes
such as sport halls, power stations, waste repositories, mining operations and
underground cities. The ventilation system is a key factor in the design of such
spaces. Moreover, as the underground operations are continuing to develop to
greater depths, the associated issues with the ventilation systems such as the heat
load and airborne contaminants are becoming more important.
Keywords
heat transfer, forced convection, underground ventilation, baffle.
Related Book
Other papers in this volume
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