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Abstract

This report consists in part of a deeper analysis of pressure differences measured in three dwellings. A further part of the report is a study of the effect of surrounding buildings on pressure distribution on basis of wind tunnel results. The report ends with a brief literature study on the effect of turbulence on ventilation. The salient results can be summarized as follows: - Obstacles such as sheds, partitioning walls between gardens and buildings up to a distance of 20 m have a major effect on pressure distribution. The effect, expressed as the dimensionless pressure coefficient K, is on average 0.10 to 0.15, and at most 0.30. - The roughness of the surroundings up to a large distance can have an effect which, when expressed as the dimensionless pressure coefficient K, is 0.30 for the maximum difference between on one hand, almost no buildings or woods and, on the other, a normal building density. - In the processing of pressure data, linear averaging of pressure differences has almost no effect. The result is that measuring data are simpler to record. - Theories on turbulent flow in cracks fail to account for the facts, because they assume ideal (i.e. smooth and regularly shaped) cracks

Additional information

Authors: DE GIDS W F, TNO, DELFT (THE NETHERLANDS);PHAFF J C, TNO, DELFT (THE NETHERLANDS);CROMMELIN R D TNO, DELFT (THE NETHERLANDS), TNO, DELFT (THE NETHERLANDS)
Bibliographic Reference: EUR 10877 EN (1986) MF, 11 P., BFR 150, BLOW-UP COPY BFR 200, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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