A tracer gas technique for the measurement of airflow in headings.

Describes method of measuring air flow in mines using nitrous oxide as a tracer gas. Examines two methods of measuring airflow, releasing a continuous stream of a gas and releasing a known quantity of gas. Describes laboratory study andunderground tests of method. Concludes that technique is reliable and accurate.

Design and performance of a portable infiltration meter.

Gives formula for calculating air-change-rate from decay rate of a tracer gas. Discusses different tracer gases and detecting instruments. Describes portable meter used to measure the concentration of helium. Discusses its performance and describes the experimental procedure.

Measurement of infiltration in two residences part 1: technique and measured infiltration.

Reports investigation of air infiltration in two residences using helium as a tracer gas. Describes the residences, instrumentation and test procedure. Gives results of decay rate of tracer gas and measured infiltration rates. Summarizes test conditions in tables of temperature, wind speed and direction, internal to external pressure differences and height of the neutral zone. Concludes that in houses with warm-air heating systems a single helium analyzing cell in the return air-stream would provide a satisfactory indication of house infiltration rate.

Experimental studies in natural ventilation of houses.

Describes experimental studies of the natural ventilation of four similar houses with different ventilating systems. Describes houses and gives experimental procedure and results of measurements of air-change-rates using hydrogen as a tracer gas.Shows variation in air-change-rates are due mainly to changes in wind speed and that wind direction and temperature difference are secondary factors. Estimates rate of heat loss as a functionof wind speed. Discusses relationship between measured pressure differences and wind speed and direction.

The thermal performance of a two-bedroom mobile home

Reports tests made on a mobile home to evaluate its thermal performance. Describes home, instrumentation and test procedure. Gives energy consumption as a function of indoor-outdoor temperature difference. Finds that oversized heating plant resulted in low seasonal operating efficiency. Air infiltration was measured using pressurization technique and SF6 as a tracer gas. The latter showed that operation of the heating plant induced higher air infiltration rates. Reports thermographic survey of interior surfaces which showed air paths formed by wrinkles in the surface insulation.

Automated air infiltration measurements and implications for energy conservation

Gives theoretical justification for the use of tracer gas method for measuring air infiltration. Describes automated instrumentation system using sulphur hexafluoride as a tracer gas. The system consists of an electron capture detector, an automation unit, an SF6 storage and injection panel, a cassette recorder and corresponding plumbing and tanks. Gives examples of field use of system.

An automated air infiltration measuring system using SF6 tracer gas in constant concentration and decay methods

Describes a system which measures the rate of air infiltration in buildings using sulphur hexafluoride as a tracer gas. Discusses two methods for evaluating the infiltration rate,the decay method and the constant concentration method. The system automatically operates a portable electron capture detector /chromatograph and samples air on a one-minute cycle. In the decay method the slope of concentration vs time on a semilogarithmic plot can be used to compute infiltration rate.

Halogenated compounds as gaseous meteorological tracers.

Reviews use of tracer compounds to demonstrate the transfer of pollutants from one local area or city to another. A study of gaseous compounds resulted in the selection of three suitable materials:sulphur hexafluoride, bromotrifluoromethan andOctafluorocyclobutane. These materials are all non-toxic, rare in the atmosphere and can be readily dispersed from tanks.Describes two systems developed to detect tracer gases. Sensitivity of 10-5 p.p.m. was achieved for sulphur hexafluoride without concentration of the sample. Gives method for collectingair samples and analysing them.

Ventilation measurement using gas-chromatographic analysis of sulphur hexafluoride. Ventilationsmatning med gaskromatografisk analys av svavelhexafluorid.

Describes use of SF6 in tracer gas studies to determine solvent fumes in indoor and outdoor environments and how meteorological conditions affect SO2 content of atmosphere. Lists instrumentation used. Discusses properties of SF6 and properties required of a tracer gas, calibration and comparison of U.S. and Swedish results. Lists practical problems both general and specific to gas chromatography and factors affecting results. Suggests future development prospects stating advantage that lower concentrations of SF6 are required compared with N2O for examples.

The variation of infiltration rate with relative humidity in a frame building

Describes investigation of air infiltration in a house using chlorothene as a tracer gas. Gives table of the data collected. Reports the unexpected result that infiltration rates could bereduced by increasing inside relative humidity. Suggests this is due to changes in hygroscopic building materials, especially wood. Concludes that increasing relative humidity from 20 to 40%could save from 5 to 15% on fuel costs. This analysis does not take into account the energy used to evaporate humidification water.

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