Dynamic behaviour of pollutants generated by indoor combustion

When indoor air concentrations from indoor combustion processes are estimated, source strengths and ventilation rates are usually considered. Recent studies, conducted in the Energy Research House at Iowa State University, indicate that seve

Effectiveness of local ventilation in removing simulated pollution from point sources

The effectiveness of range hoods and window fans in removing indoor pollutants is considered. Tests were conducted in a two-room test space with an infiltration rate less than 0.1 hr-1 using sulphur hexafluoride as a tracer gas. Range hood te

Ventilation measurement using spot sampling of sulphur hexafluoride on a solid absorbent

Describes the technique employed, including the mathematical model as well as results from a validation test using an experimental chamber. The model assumes an exponential decay of the tracer gas concentration. The precision of the analytical procedure is estimated at better than 9%, while the error of the measured ventilation rate of the test chamber was 5%.

A systems approach to the monitoring of indoor air pollutants

Building design and building construction technology has improved in the past decade and the concern over indoor air pollutants and their health effects has increased. A multi-point, multi-pollutant air sampling and analysis network was insta

Contaminant build-up in houses.

The relation between air infiltration rate and indoor concentrations of radon gas, radon daughters, and formaldehyde has been investigated for both summer and winter conditions in a number of Toronto houses with low rates of natural ventilation.

The effect of tracer gas on the accuracy of air change measurements in buildings

Compares the air change rates measured using the decay method with several different tracer gases. The tracer gas measurements were conducted in atightly sealed room where constant air leakage rates, ranging from 0.05 to 1 air change per hour could be maintained using an exhaust fan. The tracer gases investigated were CH4, CO, CO2, N2O and SF6. The agreement between tracer gas measurements and measured flow rates of the exhaust fan was very good for CH4, CO and N2O.

Natural infiltration - tracer gas test Infiltration naturelle - test au gaz traceur

Provides the results of tests into tracer gas concentration decay carried out in 15 Belgian apartments (Concours CHT) in 1982 to determine the rates of air infiltration. The tests formed part of a research programme which included pressurisation

Ventilation in industrial buildings. Final report

The problems associated with the measurement of ventilation rates and air movement patterns in large single cell buildings which were unoccupied and unheated were investigated using the tracer gases nitrous oxide and sulphur hexafluoride. 

The measurement of air infiltration in large single cell industrial buildings.

Carries out measurements of the air infiltration rate of 3 large single cell buildings using the tracer dilution method. The purpose is to determine whether or not there are any special difficulties in using the tracer dilution method in this type of building, prior to emabarking on a more substantial measurement program. Uses nitrous oxide and sulphur hexafluoride as tracers. Finds both to be satisfactory, but concludes that SF6 in conjunction with a portable gas chromatograph performs more reliably when used for on-site measurements.

Measured effect of forced ventilation on house infiltration rate.

Conducts tests over a period of 18 months in a house near Knoxville Tennessee to determine the effect of forced ventilation on the infiltration rate. Uses an outside-vented electric dryer as the power vent. Carries out testing during a variety of weather conditions. Uses SF6 as a tracer gas to measure infiltration rates. Develops a non-linear regression based on measured data relating the change in house infiltration rate to the vent rate.