LoginTwo models were applied to predict particle deposition in ducts, one theoretical, the other based on experiments. These models are described and a comparison of their predictions is compared to experimental results.
Bibliographic database Airbase
AIRBASE is the Bibliographic Database of the AIVC. It contains publications and abstracts of articles related to energy efficient ventilation. Where possible, sufficient detail is supplied in the bibliographic details for users to trace and order the material via their own libraries. Topics include: ventilation strategies, design and retrofit methods, calculation techniques, standards and regulations, measurement methods, indoor air quality and energy implications etc. Entries are based on articles and reports published in journals, internal publications and research reports, produced both by university departments and by building research institutions throughout the world. AIRBASE has grown and evolved over many years (1979 to present day, over 22000 references and 16000 documents available online). For most of the references, the full document is also available online.
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Ways of removing from indoor air particulates smaller in diameter than 1 micrometer, through enhancement of particle deposition in a filter, were investigated using numerical simulation.
A new version of 'classification for indoor climate, construction and building material' has been published in 2001 in Finland, giving recommendation on ventilation systems and their cleanliness.
Labelling of HVAC systems is a direct consequence of the publication of test procedures and recommended criteria in Finland. Cleanliness parameters are dust quantity, oil residues and odours emissions.
Visual inspection is a subjective method but yet necessary to control duct cleanliness. In order to improve its reliability, a visual scale has been realised and results from a panel of 10 inspectors have been compared to measurements.
Maintenance is often limited to repair and failure response and not dedicated to indoor environment.
The effect of duct cleaning has been checked on 15 buildings. Indoor air quality measurements and questionnaires have been operated 3 months before cleaning and 1 month after.
The demand for duct cleaning has been increasing exponentially over the last few years and to determine objectively if the duct is dirty and has to be cleaned is necessary.All air-handling units from a school district (18 buildings) and representa
The aim of this study was to evaluate the amount of dust in supply air ducts in 18 recently installed ventilation systems constructed according to two different class of cleanliness.
In the context of the definition of new national ventilation cleanliness classes in Finland, it is important to develop a clean method for the installation of ducts.
The paper presents hygiene requirements to be met by hospital HVAC plants and analyses them critically for different type of rooms (confined rooms sterile protected, operating room, special areas).
This new standard goes much further than previous one in addressing pre-cleaning assessments, control and containment during the cleaning process as well as a lot of other variables that can impact the indoor environment.
The study has monitored two office buildings during 3 years changing position of dampers in order to control the air change in the buildings on periods of 3 months. CO2 levels, absenteism rate and rhinovirus in air samples are commented.
The study investigates the relationship between ventilation rates and work performance on two specific tasks (talk and wrap-up) in a call-center.
The study presents a cost analysis including energy calculations for three outdoor climates (cold, moderate and hot) to improve indoor air quality in an existing building considering both variable air volume (VAV) and constant air volume (CAV) sys
Several previous calculations have shown that many of the measures taken to improve indoor air quality and climate are cost-effective when the potential savings are included into the calculations as benefits.
Particle penetration into an unoccupied research house was investigated through measurements under different conditions. Onmy particles with aerodynamic diameter of 20 to 3000 nm enter the house in significant quantity.
Two aluminium windows were tested to determine the fractional penetration of airborne particles. Results show that mainly particles of 0.2 to 3 microns enter through both windows.
The filtration efficiency of residential furnaces air filters was measured in several houses in Canada. Even efficient filters have a minor influence on particulate levels in houses. The ways to reduce these levels were investigated.
Particles distribution in type and size were determined in six office buildings in Oslo (Norway).