Analysis of air change rates in Swedish residential buildings.

Measurements on the rate of air exchange in residential buildings have been carried out by the Swedish Institute for Building Research since 1970. The results of an analysis of these measurements are presented in this paper for about 500 buildings not having mechanical ventilation. The studied buildings include one- and two-storey, detached, single- family houses, row houses, and multifamily residential buildings built between 1900 and 1982 and of various design. In some cases, the buildings have been retrofitted by improving the insulation of the attic or the exterior walls.

Effects of surrounding buildings on wind pressure distributions and ventilation losses for single family houses. Part 1: 1 1/2-storey detached houses.

This wind tunnel investigation studies the effects of surrounding buildings on the wind pressure distribution over a 1 1/2-storey single-family house. Pressure coefficients obtained in the tests have been used for the calculation of air change rates and associated heat losses from the house for a range of wind speeds and internal-external temperature differences. For these calculations leakage areas in the building envelope have been assumed to be uniformly distributed.

Determination of reference wind for the calculation of heat losses associated with change of air in buildings. Determination du vent de reference pour le calcul des deperditions thermiques liees au renouvellement d'air des locaux.

Describes a method to estimate differences in external pressure values between walls from known mean pressure coefficients on the facades and roof of the building in question and from the determination of wind values on the site and at the same height as the building.

Mean pressure on ordinary buildings. Application to the design of ventilation systems. Champ de pression moyenne sur les constructions usuelles. Application a laconception des installations de ventilation.

The distribution and level of pressures due to the wind on the external faces of buildings condition the working of ventilation systems and hence the thermal losses. This article presents the results of wind-tunnel experiments imitating natural wind, in the form of a "mapping" of the mean pressure coefficients exerted on the ordinary forms of dwelling. Attention is also given to the local effects on extraction outlets on flat roofs.