LoginA "HESCO"-type diffuser was selected as an example for the validation exercise in the IEA Annex 20 project (Air flow pattern within buildings). It consists of 84 small round nozzles that are arranged in four rows in an area of 0.71 m x 0.17 m.
12th AIVC Conference - Ottawa, Canada - 24-27 September 1991
The 12th AIVC Conference - Air movement and ventilation control within buildings, was held in Ottawa, Canada, 24-27 September 1991.
Contains 88 papers.
Volume content
A test room with a Displacement Ventilation System was built. Temperature control was provided with a DDC (Direct Digital Control) System, controlling the air volume and the air inlet temperature.
Comparison of airtightness, IAQ and power consumption before and after air-sealing of high-rise residential buildings. | 1991 | English
Air infiltration and ventilation has a profound influence on both the internal environment and on the energy needs of buildings.
Seen from the AIVC Technotes 21 and 28, Ventilation Efficiency is still a complex concept. As well for measurements as for simulations.
This paper reports the design, development, calibration and testing of a fast-response, multi-channel tracer gas concentration measuring instrument.
Dispersion pattern of contaminants in a displacement ventilated room - implications for demand control. | 1991 | English
A passive tracer gas technique has been used in an experimental study of the distribution of contaminants in a room with displacement ventilation.
This article discusses the application of tracer gas methods to industrial hygiene investigations.
A conference room has been converted to temperature- and carbon dioxide controlled ventilation. A number of tests have been conducted with the system in different load conditions.
In Halmstad a multi-apartment house has been built with air carried heating. Fresh air was used as the only heat carrier. To improve the air quality it was decided not to use circulation flow, which is normally required for air carried heating.
Mechanical devices such as exhaust fans and air handlers interact strongly with natural infiltration.
Is it possible to translate a computed flow field to a design case with different physical dimension?
A new passive tracer gas method for ventilation measurements is described. The method utilizes passive tracer gas release from aliquid perfluorocarbon compound contained in a glass vial, equipped with a teflon membrane.
The passive perfluorocarbon method (PFT-method) has been successfully applied in ventilation measurements in rooms. The method is, in principle, also applicable to air flow measurements in ventilation ducts.
The knowledge of IEA-Annex 14 'Condensation and Energy' has been applied to develop a new strategy for humidity control in dwellings. The presented control element assures safe prevention from mould growth at a minimum energy consumption.
Field investigations were undertaken on five houses to determine the potential for improved performance and lower costs through the use of a demand controlled ventilation (DCV) systems.
The study recommends adoption of the new higher ventilation rates, but with the use of alternative occupancy densities.
The use of test chambers for characterising the emissions of volatile organic compounds from indoor building materials. | 1991 | English
Increasing interest is attributed to the problem of the accumulation of organic vapours emitted from indoor building materials due to an effective insulation of buildings with low ventilation rates.
Measurement of the entrance length and friction factor of ducts using tracer gas techniques. | 1991 | English
We describe the use of constant injection and pulse injection techniques for measurement of airflow in a duct. Tracer-gas measurements were compared with measurements made using a pitot tube and a hot-wire anemometer.
The possibility of unacceptable internal air pollution levels can cause concern at the design stage given the potential for cross contamination between building exhausts and ventilation intakes is there.
The present work is an investigation of ground heat exchangers for the air-conditioning of the supply air to residential buildings.