LoginThis paper evaluates the suitability of humidity-controlled house ventilation system to determine (i) the effectiveness of relative humidity as a sensing element, and (ii) the operating and performance characteristics of such ventilation strategy.
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
Performance analysis of demand controlled ventilation system using relative humidity as sensing element. | 1991 | English
Conventionally used thermal anemometers are able to measure velocity, but cannot determine direction.
The measurements reported in this paper were carried out in a mock up of an office room, ventilated by a commercial supply air terminal consisting of 84 nozzles (characteristic dimension SqRoot of As = 0.0975 m).
Kitchen hoods are frequently found in Belgian kitchens. Most of them have as only function intensive ventilation during certain cooking activities.
A commercially available humidity controlled natural ventilation system (Aereco) has been installed in the framework of a CEC demonstration project in 3 apartment buildings in France, the Netherlands and in Belgium.
This report describes tracer gas measurements of the local mean age of air at different locations within an office room.
A test programme has been designed to evaluate the performance characteristics of sensors for the automatic control of ventilation rates.
Simplified, physical models for calculating infiltration in a single zone, usually calculate the air flows from the natural driving forces separately and then combine them.
The work in this paper contributes to the work in the IEA - Annex 20 "Air Flow Patterns within Buildings" and presents a series of full-scale measurements of the concentration distribution in a room with isothermal mixing ventilation.
Modern one-family houses in Scandinavia are often ventilated by an exhaust fan. Most of the outdoor air probably enters through whatever cracks and openings there are and only a small part enters through the supply vents in many of these houses.
This paper illustrates the principles of demand controlled ventilation systems (DCV) as applied to office buildings.
The reliability of infiltration and air movement data obtained from single tracer gas measurements in large spaces. | 1991 | English
The methods available for the measurement of air infiltration and air movement in large industrial halls are restricted by the size of the building and the nature of the operations which take place within it.
A laboratory investigation has been made in a modern Swedish bathroom continuously ventilated by an exhaust fan. The tests consisted of measurements of the humidity, temperature and local mean-age after a standard shower.
Tracergases provide a way to determine airflows in different situations. In some cases it is the only way to get quantitative information.
The simulation of infiltration rates and air movement in a naturally ventilated industrial building. | 1991 | English
This paper describes the application of numerical models to predict the ventilation rate and internal air movement patterns for a naturally ventilated industrial building and compares the results with measured data.
Ventilation flow analysis - flow visualisation and LDA measurements in water scale models, validation of numerical results. | 1991 | English
Within the frame of the IEA Annex 20, laboratory and numerical experiments were conducted in order to study the flow within an isothermal parallepipedic testroom (L x W x H = 4.2 m x 3.6 m x 2.5 m).
The performance of a system for demand-controlled ventilation was investigated for a period of 1.5 years. Presence sensors of the passive infrared type are used to control the ventilation rate in each classroom.
Tracer gas tests were conducted on a five-storey apartment building to determine the air and contaminant flow patterns within the building.
A new algorithm for the continuous measurement of variable air change rates with tracer gases will be presented. It differs from the constant concentration method by allowing the concentration level to vary according to the air change rate.
Knowledge of air movement within a building is often a condition for solving problems with the spread of pollution.