The paper presents an original computer code for the analysis of contaminant diffusion in rooms developed at the Politecnico di Torino and its experimental validation by means of a test facility located at the University of Basilicata (Potenza). Thevelocity fields in isothermal conditions, together with localages of the air, have been analysed and compared, with different ventilation strategies and number of air changes.
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.
Describes a model that predicts air infiltration from both wind and temperature influence to within 20%. Compares the predicted value and measured infiltration from a full-scale test structure, revealing an average discrepancy of less than 10 m3/hr (out of an average of approx 150 m3/hr). Presents direct measurements of the wind velocity and pressure coefficients induced by the wind on the full-scale test structure.
Describes the Mobile Infiltration Test Unit (MITU) and its instrumentation, including some preliminary tests of the individual measurement systems. MITU has a completely automated data acquisition system that records air infiltration rates, surface pressures and weather as half hour averages. Theshell of the tracker is well sealed and the quantity ,type and distribution of leakage area is controlled using removable leakage panels in 16 window openings.
Describes LBL's Mobile Infiltration Test Unit (MITU) which spent the 1980-1981 winter in the field collecting the data required for infiltration modelling. Data included measured infiltration rates, surface pressures, wind velocities, indoor and outdoor temperatures, leakage area and leakage distribution. Comparisons of measured infiltration rates with values calculated from surface pressures (using MITU) have shown no decrease in accuracy when a square-root flow model is used instead of the general power-fit model of leakage.
Reports on a comparative study of residential infiltration as predicted by computer model and as measured in the Mobile Infiltration Test Unit (MITU) as well as in selected test houses, both occupied and unoccupied. Sensitivity analyses were also conducted on each parameter contained in the model against data obtained from MITU.
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