LoginModern inlet devices applied in the field of ventilation of rooms are getting more complex in terms of geometry in order to fulfil the demand for thermal comfort of the occupants in the room and in order to decrease the energy consumption This exp
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
Modelling complex inlet geometries in CFD - applied to air flow in ventilated rooms. | 1991 | English
Investigation of a combined ventilation and heating system for residential buildings. | 1991 | English
Combined ventilation and heating systems in floors demand extensive investigations about the heat transfer before they could be installed in residential buildings.
A set of diagrams for estimating flow coefficients and exponents in the power law flow equation for cracks are presented.
Modelling of airflows, temperatures and contaminant levels for localized ventilation systems. | 1991 | English
Results of 3-D computational fluid dynamic simulations of the air flows, temperature distribution and contaminant remove efficiencies for typical workstation configurations which include the option for localized supply of outdoor air will be prese
Experimental investigation of convective couplings across various doorways under horizontal temperature gradients. | 1991 | English
Inter-zone convection affects the general movements of air in a building and must be evaluated for accurate thermal zones heat and mass balance.
A new approach for the numerical identification of interzonal airflows from tracer gas measurements. | 1991 | English
This paper presents a new approach to determine the interzonal airflows of a multizone system using tracer gas measurements.
Both infiltration and exfiltration has a predominant influence on the space heating requirements in cold climates. Good predictive design methods are required to estimate the air leakage component in buildings.
A mathematical model has been developed which will facilitate the prediction of infiltration rates within multi-zone buildings.
Integrated forced-air heating and ventilation systems: evaluation and design considerations. | 1991 | English
Mechanical systems which use common ducts for combined heating and ventilating functions are becoming popular in the Pacific Northwest (U.S.).
Definition of the flow parameters at the room inlet device - measurements and calculations. | 1991 | English
Due to the limitations of computer storage and time the flow boundary conditions at an air inlet device have to be specified for numerical simulations of air flow patterns in rooms.
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.
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.
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.
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.
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.