Wind-induced ventilation has the potential to reduce cooling energy use in buildings.
One method this can be achieved is by the use of night-time ventilation to cool down
the structure of a building, resulting in lower air and radiant temperatures during the
day. To design effective naturally ventilated buildings, evaluation tools are needed that
are able to assess the performance of a building. The primary goal of this work was to
develop such a tool, that is suitable for use in annual building energy simulation. The
model presented, is intermediate in complexity between a CFD numerical model and
current single air node models, having seven nodes.
The thesis describes how numerical and experimental data have been used to develop the
structure and define the parameters of the simplified nodal model. Numerical calculations
of the flow and temperature fields have been made with a coupled flow and radiant
exchange CFD code. Numerically derived velocity dependent convective heat transfer
coefficients are compared with experimental measurements made in room ventilated by
cross-flow means, and with empirical correlations cited by other studies. Bulk convection
between the air nodes of the simplified nodal model has been derived from a numerical
study of contaminant dispersal. The performance of the model is demonstrated by
making comparisons with the predictions of a single air node model.
A Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough University.