The moisture and thermal performance of a typical insulated wood-framed residential wall structure was investigated in the laboratory. The study included the effects of three types of vapor retarder systems and the effects of zero, positive, and negative total pressure differences across the wall. Exposure conditions were representative of a northern winter climate.
Radon-222 and 222Rn progeny concentrations, barometric pressure and pressure differentials between inside and outside were measured continuously in the basement of a recently constructed energy-efficient house in metropolitan Denver, Colorado
Describes a method to estimate differences in external pressure values between walls from known mean pressure coefficients on the facades and roof of the building in question and from the determination of wind values on the site and at the same height as the building.
Smoke control makes use of mechanical fans to produce airflows and pressure differences to control smoke movement. Describes one day of tests of the smoke control systems at the 6-storey VA hospital, San Diego, California.
Deals with a code providing directives for design and construction of cold stores, drafted by the Foundation for Development of Refrigeration Technique (Stiftung Ontwikkeling Koeltechniek). Gives threshold values for admissible pressure difference and admissible measure of non-tightness, and values forthe required pressure equalizing opening, depending on nature and size of the cold room.
Reviews air infiltration measurement methods, prediction models, and flow through components of buildings. Attempts to construct a device capable of measuring air flow through a building component under a given pressure difference and to investigate the existence of a coefficient which, when multiplied by the pressure difference, raised to an exponent, will yield the air flow through that component. Components were tested under differing pressure differences and the testing device was calibrated by a tracer gas technique.
To update the National Association of Home Builders Thermal Performance Guidelines, models were developed, representative of the new houses being constructed in each American state. The models define the number and types of windows and doors,
The quantity of air in several rooms lying in a stack connected by means of fresh air and exhaust air ducts is considered as a simple model of amultistorey building. Negative pressures set up within the rooms can be equalised by adjusting the
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