LoginA constant concentration tracer gas (CCTG) measuring system needs a control algorithm to calculate, at each sampling time, the required tracer gas injection rate to keep the gas concentration at a target level.
9th AIVC Conference - Gent, Belgium - 12-15 September 1988
The 9th AIVC Conference - Effective ventilation, was held in Gent, Belgium, 12-15 September 1988.
Contains 44 papers.
Volume content
Development of an efficient control algorithm for a multizone constant concentration tracer gas air infiltration measurement system. | 1988 | English
In the framework of a project of the International Energy Agency (IEA) , IEA-Annex XVIII - Demand Controlled Ventilating (DCV) Systems, which started in fall 1987, a review of the state of the art of already existing DCV systems and devices has be
The technique of tracer gas measurement has during recent years tended towards increasingly complicated measuring methods.
Indoor formaldyhyde levels in energy efficient homes with mechnical ventilation systems. | 1988 | English
Mechanical ventilation systems have been adopted in airtight energy- efficient houses in Canada to provide fresh air, remove moisture and indoor pollutants and provide a comfortable environment for the home-occupants.
Further studies of passive ventilation systems - assessment of design and performance criteria. | 1988 | English
Increases in building air tightness for purposes of energy saving have, unfortunately, also led to a significant increase in the number of instances of condensation damage, particularly in domestic properties.
The ventilation of a test room (LxWxH = 5.4x3.6x2.4 m) with a wall mounted heat source is investigated for two different air terminal devices.
Tracer gas techniques for measuring airflow rates in building systems are considered.
Air leakage through the building envelope is of great importance for the energy use of a building. However, from an indoor air quality standpoint, the size of interior leaks in e.g. multifamily buildings could be important as e.g.
Traditionally air has been supplied from the ceiling to the occupants below opposing the buoyancy effects due to heat convected from people, lights and machines.
Examinations about the air humidity in lived dwellings depending on different air ventilation systems using a new characteristic value. | 1988 | English
This work deals with problems of the air humidity in inhabited dwellings. A new approach is presented here which renders the definite diagnosis of humidity problems possible.
Ventilation produced by fluctuating pressure differences across a building appears to have received little attention . Such fluctuations are produced by gustiness of the wind or turbulence in the flow around a building.
This paper describes a two-dimensional numerical study, by finite-volume method of buoyancy-driven flow in a half-scale model of a stairwell.
The project is aimed to develop the quantitative method of visualization of the air steams in application to the indoor problems of heauilg , ventilating and air conditioning.
The influence of a controlled natural ventilation on the indoor radon decay products concentration: a case study. | 1988 | English
Air exchange rates in occupied buildings are difficult to assess due to their dependence on a multitude of climatic parameters and inhabitant behaviour.
This paper is concerned with natural air flows between major construction cavities in New Zealand houses.
Numerical simulation of indoor turbulent air flows caused by cross-ventilation and its model experiments. | 1988 | English
Since thermal comfort on human body is influenced by the local air flow speed, it is needed to estimate the distribution of air flow speed in a room for the "effective ventilation".
The paper presents the development of a ventilation scheme for a large bus station and passenger interchange in Bilbao, Spain.
Analysis of errors for a fan-pressurization technique for measuring interzonal air leakage. | 1988 | English
The problem of predicting air flows in a multi-zone building has received considerable attention in the past ten years.
To avoid the shortcomings and problems that occur in today's ventilation systems a ventilation concept for future dwelling-houses is under development. The concept responds to the way of living and building in the future.
Zone to zone tracer gas measurements; laboratory calibration and values of air flows up and down stairs in houses. | 1988 | English
This work is concerned with measuring air flows between the floors of houses. A simple measuring technique is described in which two portable SF6 systems were employed. The design and construction of the portable system are presented.