The study, carried out in an atmospheric wind tunnel (reproduction of natural wind conditions, particularly turbulence), quantifies wind flows around built-up obstacles in their realistic location context, and the associated pressure fields. For various types of buildings (detached house, block of flats), the article presents in illustrated form the chart of these flows and pressures in general (mean values, standard deviations, extreme values), but deals more specifically with the wind resistance of solar collectors.

Roof space ventilation is important in warm weather to dry out moisture that may have accumulated in the roof space. It is important to reduce the movement of moisture from the living areas to the roof space and to ventilate the latter by means of vents distributed between the upper and lower parts of theroof to take advantage of both wind action and stack action.

An exposure chamber for testing passive dosimeters suitable for measuring indoor air pollutant concentrations has been designed. A simplified version of the chamber was constructed and formaldehyde passive sampling devices were exposed within this chamber. Both CSC prototype and AQRG dosimeters were tested, and an attempt was made at calibrating the devices by verifying their theoretical sampling rates. The sampling rate for CSC devices was found to behigher than expected.

Tests were performed in 3 homes for 1) carbon monoxide, 2) nitrogen dioxide, 3) nitric oxide, 4) total hydrocarbons and 5) formaldehyde. Total particulate matter, by a numerical counting method, was also measured in Homes 1 and 2.

A study was conducted to determine the air leakage rates in Skymark 1, a high rise condominium in Toronto, particularly air leakage rates of the exterior walls of "Florida Rooms" which were constructed by the enclosure of original open balconies.

A test method for determination of air flow resistance of exterior membranes and sheathings is described. The test specimen is placed between two chambers with different air pressures and the volumetric air flow rate through it at a steady state is determined. The relevant experimental quantities can presently be measured with precision better than 0.5% and with an accuracy of 2 to 3%, using commercial instruments. However, the instrumental precision does not mean much, due to the uncertainty introduced by material variability normally occurring in commercial products.

The multiple tracer gas technique of I'Anson et al. has been improved, in order to increase the rate at which samples can be taken. Using parallel gas chromatographic separation columns and an electron capture detector, it is now possible to take an air/tracer gas sample every thirty seconds in the case of a two-zone ventilation and air movement test. Rapid sampling enables a new,simplified analysis of the air movement between two connected zones to be employed. This analysis derives ventilation rates and intercell airflows simultaneously.

A large proportion of heated rooms depend primarily on natural convection for the distribution of heat within the occupied zone. A method of predicting air temperature variations with height is presented. Using the heat and mass flow rates of the driving convection plume, along with the corresponding parameters of downward flowing air streams at cool surfaces, an estimation of the maximum (upper) temperature and the minimum (lower) temperature can be made. Incoming air entry points can also be taken into account.

Describes the measurement of air change rate and airtightness of a mechanically ventilated public swimming bath in Belgium. The relationship between airtightness and air change rate is outlined. Various methods of calculating the air leakage from the pressurization results are compared. Nitrous oxide was used for the tracer gas measurements, which were made both with and without the mechanical ventilation system working. The LBL model was used to calculate the air infiltration rate.

Explains the principles involved in condensation and the conditions producing condensation, both atmospheric and other sources of moisture. The behaviour of absorbent materials and surfaces is described. Interstitial condensation is explained. Designing to avoid condensation, taking account of the characteristics of the building fabric and the environment, is necessary. A worked example of estimating condensation risk is given.