Paper 8
Natural and Mixed Ventilation Design via CFD and Architectural Modelling
Marija
Todorovic1, Olivera Ecim1, Aleksandar Marjanovic2
and Ivan Randjelovic3
1Laboratory
for Thermodynamics and Thermotechnics, Division for Energy Efficiency and
Renewable Energy Sources, University of Belgrade
2VTI,
Belgrade, Serbia
3CIP,
Belgrade, Serbia
Abstract
Numerical simulations and
computational fluid dynamics can be usefully integrated with architectural
modelling to provide designers with a powerful single CFD based
architectural modelling and design framework.
This framework can be interfaced with building thermal performance
modelling thus further integrating the full thermal and flow domains
within architectural modelling. CFD analysis is generally restricted to
the building’s environment flows or indoor single rooms and flow in
spaces. In addition the designer must supply boundary conditions in the
form of the external and internal building envelope/wall surface
conditions. In the case of natural and mixed ventilation, this presents a
fundamental problem since the outdoor and indoor boundary conditions are
dynamic, inter-related and interactive via the building’s architecture.
Furthermore they are dependent on external weather conditions, the indoor
environment, controls and related heat gains. Therefore, in this study the
boundary conditions for both the inside and outside of the building are
dynamically described in order to develop an integrated CFD, BPS and
architectural modelling approach, as a unique new design framework. This
leads to the energy efficiency optimisation of natural and mixed mode
ventilation. This paper presents an implementation of such an approach in
the design of a building complex in
Belgrade
in which predicted flow patterns are used to optimise the architectural
design and the size and location of ventilation openings. The needs for
further research and engineering development are outlined. Finally to
operate effectively and energy efficiently, natural and mixed ventilation
requires an appropriately sensitive sensor to measure very low pressure
differences at different building heights for the optimum control of
mechanical ventilation system operation. The development of such a sensor
is described.
Key words: CFD,
architectural design, natural ventilation, hybrid ventilation, mixed mode
ventilation, pressure sensor.
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Contents
Paper 1
Indoor
Air Quality in Fifty Residences in
Athens
: Santamouris, M., Argiroudis, K., Georgiou, M., Livada,
I.
, Doukas, P., Assimakopoulos, M.N., Sfakianaki, A., Pavlou,
K., Geros V. and Papaglastra, M.
Paper
2
Variable Air Volume-Flow Systems - A Possible Way
to Reduce Energy Use in the Swedish Dairy Industry: Rohdin, P. and
Moshfegh, B.
Paper
3
Experimental
Evaluation of Combined DCV and Economizer Cycle Using a FLC Variable Air
Volume (VAV) System: Karunakaran, R., Parameshwaran, R., Iniyan, S. and
Anand A. Samuel
Paper
4
Effects
of Nozzle Geometry on the Air Flow Jet and Temperature Distribution in an
Enclosed Space: Khan, M.I.
Paper
5
Automatic
Ventilation Control of Trickle Ventilators: Ridley,
I.
, Davies, M., Booth, W., Judd, C., Oreszczyn, T. and Mumovic, D.
Paper
6
Minimum Outdoor Air Supply for Radon in High Rise
Residential Buildings - Natural Ventilation v Air-Conditioning Unit: Lam,
K.S., Chan, E.H.W., Chan, D.W.T., Fung, W.Y., Law, K.C. and Tai, C.T.
Paper
7
Measurement and Prediction of Aerodynamic
Stability of an Axial-Flow Ventilation Fan near the Stall Condition: Cao,
R. and Hu, J.
Paper
8
Natural
and Mixed Ventilation Design via CFD and Architectural Modelling:
Todorovic, M., Ecim, O., Marjanovic, A. and Randjelovic, I.
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