English

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.

Air Infiltration in Norwegian buildings has been an unknown parameter. This paper is based on results from measurements in nine different buildings in Norway. The measured parameters have been: infiltration envelope air humidity and temperatures on theinside and outside of the building. The infiltration has been measured continuously with tracer gas using the constant concentration method. In addition air tightness measurements and thermography have been carried out to establish the dimensions and the locations of the major leaks.

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.

The proposed task addresses the measurement methods using several tracer gases to measure the air flow rates between several zones of a building and between these zones and the outside air. If the building has N zones, there are N(N+1) unknown flowrates, which can be measured simultaneously using N different tracers. In so-called active methods the sampling of the atmospheres of the zones is made an active way, that is using either a mechanical pump or a manually actuated syringe or bag.