LoginReverberant sound excitation and the sound intensity technique have been used for the measurement of the sound transmission loss of narrow slits in rigid walls.
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
Turbulent modelling of airflow patterns and ventilation effectiveness in a half scale office building. | 1991 | English
The concentrations of indoor pollutants should be maintained below recommended values at all occupied locations at any time.
The paper discusses methods to set boundary conditions at the air supply opening in predictions of room air flows with computational fluid dynamics.
Application of hot wirelfilm ariemometry in room air flows presents difficulties because: (1) the effect of natural convection due to the heated wire beconies significant for low air velocity measurements; (2) the angle sensitivity of a hot wire b
Simultaneous calculation of airflows, temperatures and contaminant concentrations in multi-zone buildings. | 1991 | English
The computer programs published so far have enabled the calculation of airflows at constant temperatures or of air temperatures at constant airflows.
Modelling complex inlet geometries in CFD - applied to air flow in ventilated rooms. | 1991 | English
Modern 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
A set of diagrams for estimating flow coefficients and exponents in the power law flow equation for cracks are presented.
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.
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.
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
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.
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.
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.
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.
This paper reports the design, development, calibration and testing of a fast-response, multi-channel tracer gas concentration measuring instrument.