In order to monitor the use of movable air intake grilles by the inhabitants a measurement system is set up in 9 apartments with anatural ventilation system in a building in Namur. The apartments to be monitored are part of an apartment building in Namur wherein a measurement campaign is going on in theframework of a CEC-DGXVII energy demonstration project. A description of the building is given in annex.
The influence of the Reynolds number on low speed flow (essentially incompressible flow) is discussed. A first set of literature is reviewed to identify effects of low Reynolds number on flows in rooms. Methods of incorporating low-Reynolds-number effects in existing turbulence models are surveyed.
IEA Annex 23 has been established in order to attempt to resolve these difficulties in relation to multizone air flow modelling. These models are used to evaluate the air flow between individual rooms or zones as well as the rate of inflow andoutflow of air from buildings. This approach is especially important for evaluating the adequacy of ventilation, predicting pollutant transport and evaluating airborne heat transfer between zones. Such models therefore have vital applications in both energy and air quality related analysis.
The scope of the task 2.2 is to provide an algorithm simulating the behaviour of the inhabitants with respect to the openings of doors and windows. The purpose of this report is to present the status of the work carried out by Scartezzini and his colleagues at the LESO-EPFL in this task on May 15th 1989.
Inhabitants may influence the indoor air quality and air flow patterns within buildings in several ways: a) through windows and doors openings; b) through action on mechanical ventilation systems (fans on and off, dampers closed and open, etc); c) creating extra-flow patterns through their own heat, when moving or using portable fans; d) through their activity, inhabitants are an important (but not the only one) source of pollutants. Some of these influences are of great importance (e.g. a and b) or might be negligible, as c) in some cases.
The objectives were a) to evaluate performance of air flow models in predicting air velocity, temperature and contaminant concentrations; b) to evaluate applicability of models as design tools; c) to produce guidelines for their use. All the work is addressed to a single zone. It includes both numerical simulations and experiments for given configurations.
In this paper a proposal has been made for the identical testroom configuration, which should be used for the measurements and numerical simulations of the identical test cases. The proposal includes the positions of the measuring points in the testrooms. I have used the collected data of testrooms from several participants and the agreements made at the second expert meeting in Warwick. Unfortunately it was not possible to find common testroom dimensions for all participants, so alternative dimensions for some participants are also given.
One method of evaluating interzone airflow rates makes use of perfluorocarbon tracers (PFTs)(4). The PFTs are emitted at asteady rate by miniature permeation sources (the physical size is 7 mm diameter and 30 mm length) with a different PFT being
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