LoginZonal models are a promising way to predict air movement, in a room with respect to comfort conditions and gradient of temperature, because they require extremely low computer time and may be therefore rather easily included in multizone air movem
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
Ventilation control of IAQ, thermal comfort and energy conservation by CO2 measurement. | 1991 | English
The use of indoor carbon dioxide levels is a good method for controlling indoor air quality in office buildings.
A "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.
Demand controlled HVAC-systems have many advantages. The principle is to optimize comfort and to minimize energy consumption simultaneously. In modern office buildings, indoor temperature is very often a useful control parameter.
Natural ventilation of dwellings is commonly applied, especially in mild and moderate climates. The disadvantage of natural ventilation is the poor control of both flow directions and flow rates within the ventilated building.
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.
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.
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.
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.
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?
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.
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.
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 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.