English

Compares full-scale pressure coefficients obtained from a 57-storey building in Toronto with wind tunnel results for tests in the 9m by 9m wind tunnel at the National Research Council of Canada. Demonstrates good agreement where sufficient full-scale data exists. Proposes a method of treating peak pressures based on the fit of an exponential distribution to a population of "significant independent events", called pressure spikes. This distribution provides a good fit to both full-scale and wind tunnel results, which generally agree.

The indoor air quality of six homes with gas and electric cooking and gas heating appliances was characterized to determine the level of gaseous and aerosol air pollutants from typical indoor combustion sources. 

The study concerns the problems and prediction of room flow in air-conditioning. It is shown how difficult it is to form mathematical models, especially of the three-dimensional flow field occurring in practice. After basic definitions, an explanation of the influence of different air flow systems on the structure of room flow is given. The microstructure of the flowis so complex that a precise mathematical model formation seems to be impossible. Measurements on isothermal and models(reduced from the original)supply reliable three-dimensional results.

Reports survey of indoor climate problems in dwellings. Questionnaires were distributed to 424 families who had complained of indoor climate problems and 240 replies were received. The questionnaires dealt with complaints relating to the dwellings and the age, profession, health and smoking habits of theoccupants. The dwellings are described by type, age, material of outer and interior walls, ceiling and floor. There are questions on ventilating habits, cleaning habits and occupants' views on dust, noise, odour, temperature, humidity and draughts.

This practice represents a standardized technique for measuring air leakage rates through a building envelope under controlled pressurization or evacuation, and is applicable to small temperature differentials and low-wind pressure conditions. It is primarily intended for use in one- story buildings.

The perfomance of single-family houses built to the new swedish building code was considered. In the code, the requirements for thermal insulation for different building sections were strengthened, and completely new requirements for a building`s airtightness were introduced. One site- built design acheived a estimated 1/3 reduction in energy consumption, but another less airtight factory-made house showed serious shortcomings in the indoor climate acheived.

Reports measurements of indoor air quality in an air conditioned California High School over a range of ventilation rates, ranging from 13.3 cu.ft. of outside air per minute for each classroom occupant to approximately 1.5 cfm per occupant. Parameters measured include outside air supply rate, theoccupants' perception of indoor air quality, microbial burden, concentration of CO2, CO, NOx, SO2, O3 in two classrooms, a hall and outdoors.

Examines various definitions of ventilation efficiency. When using tracer gas techniques the definition of a ventilation system's efficiency can be based on the slope of the tracer gas curve, or the ratio between concentrations, or the area under the curve. Examines the consequences of these definitions for a simple theoretical model. Presents experimental measurements on a test room which show that sometimes very low ventilation efficiency can occur.

Reports investigation of the limiting conditions that produce frosting on air-to-air heat exchangers. Also determines the adequacy of provisions for the prevention of frosting and ice buildup. Four types of heat exchanger were investigated as part of a more general investigation of the operating characteristics of air-to-air heat exchangers. Also reports investigation for various types of energy recovery systems of the cross leakage or contamination of the fresh air by the exhaust air.