Describes a method used for measuring the local air tightness of sections of buildings. Notes its superiority to a previous system developed by Siitonen V. in 1982. Illustrates the device schematically and explains its operation.
Indoor radon concentrations have been measured in a 13 year old two story concrete building of the University of Texas at Dallas. Variations of the radon concentration from the basement to the second floor in offices, classrooms, laboratories, storage rooms, corridors and other locations have been measured. Dependence of the above concentrations on the location and ventilation rates have been studied.
The largest contribution to population exposure from natural radiation arises from the inhalation of the decay products of radon in indoor air. In most instances the dominant source of radon within buildings is the subjacent ground. However, building materials do contribute to the radon concentration in indoor air, and in some circumstances may provide the major source. Thisreport reviews some of the literature on radon emanation from soils and building materials world-wide.
An accurate determination of air renewal rate and connective exchanges between units was needed for study of the solar units of the experimental building LESO, in both an occupied and empty state. The CESAR compact equipment for tracer gas (nitrous oxide) measurement was developed. This unit uses a microcomputer to perform a simultaneous and periodical gas analysis in 10 locations. Three tracer gas methods can be used: decay, constant concentration, and continuous flow. The device and regulating program work well with low rates of concentration (100ppm of nitrous oxide).
Reducing the air change rate of a house increases the concentration of pollutants in the indoor air. These pollutants are identified and located within the residential structure. Air-to-air heat exchangers are suggested tocontrol ventilation, and the three basic types described.
In countries such as the United Kingdom that possess a temperate climate, the majority of buildings are not air-conditioned but depend upon natural ventilation and relatively simple heating systems. Openable windows are used to reduce the in
This report discusses the extension of an infiltration predicting technique to the prediction of interroom air movements. The airflow through openings is computed from the ASHRAE crack method together with a mass balance in each room. Simulta
Thirty residences were monitored for nitrogen dioxide, carbon monoxide, formaldehyde, respirable suspended particles, and air exchange rate for forty-one one-week periods using integrating samplers. The residences were located in the northwest a
Evidence of the importance of air infiltration in moisture control in building structures has been steadily accumulating. A general model of moisture behaviour in structures has been built up including for the effects of cavity air leakage, for the hygroscopic behaviour of timber, for the effects of condensation and various geometric factors.
Continuous monitoring of NO, NO2, CO, CO2, and O2 depletion was conducted in 14 residences (13 with kerosene space heaters and one without) in two locations in the residence (room with the heater and bedroom) and outdoors. The continuous monitor
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