Multi-zone models are a common tool for calculating air and contaminant exchange within rooms of a building and between building and outdoors. Usually a whole room is then modelled by one calculation node with the assumption of homogeneously mixed conditions within this room whereas in real cases temperature and contaminant concentrations vary in space. The exchange to the neighbouring nodes via the flow paths is then a function of the local values of these variables.
Describes the activities of Annex 18, whose objectives have been to develop means, methods and strategies for DCV systems and to contribute to the implementation. A DCV system in this annex is defined as a ventilation system in which the air flow rate is governed by airborne pollutants.
Describes IEA Annex 23 on multizone air flow and pollutant transport modelling, which is divided into three subtasks. The goal of subtask 1is to develop modules to be integrated in a multizone air flow modelling system, to store the physical kno
CETHIL, Thermal Research Centre of the National Institute of Applied Sciences is a university laboratory associated with CNRS of 50 staff scientists and PhD students devoted to research in heat transfer. Since 1982 the group has been developing various contributions to multizone air flow modelling. CETHIL's contribution to Annex 23 will focus on three main axes: COMIS development, full scale experiments, error propagation.
The objective of Annex 23 is to study physical phenomena causing air flow and pollutant transport in multizone buildings and to develop modules to be integrated in a multizone air flow modelling system.
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