...: tracer gas decay measurements of whole-building air change rates, the determination of air change rates based on peak carbon dioxide (CO 2 ) concentrations, the determination of percent outdoor air intake using tracer gas (sulfur hexafluoride and occupant-generated CO 2 ), and direct airflow rate...

... as a basis for developing future guidelines for preventing moisture problems in buildings. buildings dew point diagnostic tools tracer gas fan pressurization infiltration permeability permeance relative humidity tracer gas walls water moisture Heinz R. Trechsel I METHODS FOR IDENTIFYING...

... New tracer gas techniques for measuring airflow rates in HVAC ducts and buildings airflow systems are described. These pulse tracer techniques are based upon the application of integral mass balance equations to the tracer gas concentration response of an airflow system to pulse injections...

... The air change rates of five buildings (four barracks and one vehicle maintenance garage) were measured, using the tracer gas dilution technique. The median air change rate for all zones measured was close to 0.5 air change per hour (ACH). The range of air change rates was between 0.05 and 1.75...

... Tracer gas techniques have been used to study air exchange in mechanically ventilated office buildings for many years. The analysis of the concentration of carbon dioxide (CO 2 ) generated by building occupants has been suggested as an alternate means of evaluating building air exchange...

..., the tracer gas decay method was applied to the same buildings to obtain the infiltration rates of selected apartment units. The methods used to measure the airtightness values and the air infiltration rates and the test results of the two apartment towers are discussed. leakage pressure residential...

... HVAC diagnostics, with specific emphasis concerning design versus usage, correct HVAC operation, microbiological evaluations, and tracer gas evaluations of ventilation rates. Indoor air quality HVAC microbiology contamination evaluations tracer gas ventilation assessment William A. Turner...

... industrial buildings are very leaky and some are very airtight. Therefore Nordtest has asked us to develop a method for pressurization tests of large buildings and for equipment to carry out those tests. The paper will describe the equipment and present preliminary results. air leakage tracer gas fan...

... of homogeneity of the air-tracer gas mixture in these large volume structures. Air leakage rates in the range of 0.6 to slightly above 2.0 air changes per hour (ACH) were measured. Surprisingly, these values do not differ significantly from those which might be measured in single-family residences. Since, in use...

... for occupied offices. air infiltration office buildings tracer gas ventilation Richard A. Grot^ and Andrew K. Persily^ Measured Air Infiltration and Ventilation Rates in Eight Large Office Buildings REFERENCE: Grot, R. A. and Persily, A. K., "Measured Air Infiltration and Ventilation Rates in Eight...

... Air infiltration, an important energy loss mechanism in buildings, has been studied in a number of tight homes in Sweden. Two methods of measurement have been used: the fan pressurization technique was used for measuring the airtightness of the building envelope and the tracer gas technique...

... vary from freely exposed to a sheltered urban environment. Tracer gas measurements using the decay technique have been used for the determination of the rate of air exchange. In about 300 cases, the measurement of air change rates has been complemented by measurements using pressurization techniques...

... to infer air leakage rates. This technique entails introducing small amounts of tracer gas into a structure and measuring the rate of change in tracer concentration. The air change rate can then be determined from the exponential decay rate in tracer concentration with respect to time. There exists...

... A method for collecting air infiltration data in a large sample of dwellings is presented. The method consists of a tracer gas dilution technique employing air sample bags that are analyzed in a central laboratory. The method will be applied to a Community Services Administration optimal...