In this paper information is provided about ways to model the boundary conditions near the radiator for use in the flow simulation program. Due to lack of time the modelling is restricted to the thermal behaviour of a single plane radiator as selected in 'R.I. 1.4 : Selection of radiator'. Ways to model the flow near the radiator with e.g. hot and cold wall jets have not been investigated.

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.

In this paper a proposal has been made for the radiator to be used for the measurements and numerical simulations of test case d: 'free convection with radiator'. The selection of the radiator is based on the identical testroom configuration as described in 'R.I. 1.3 : Test room, identical testrooms'. Thisconfiguration consists of a window with single glazing. However data for double glazing is also presented. A radiator of a well known manufacturer has been chosen, in order to make sure that the radiator is available in each participating country.

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.

The purpose of the proposed task is to create databases for validation on several different buildings. Data are needed as inputs for simulation programs (e.g. pressure coefficients, infiltration parameters) and more data, including air flow patterns and differential pressures, will be used to compare the results of the simulation programs with the measured values. These data bases shall contain high quality measurements results, on a given building, of climatic data, building data, inhabitant data and flow patterns.

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