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Indoor Air Quality (IAQ)
室內空氣質素設備,
室內空氣質素測試 - Assessment
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室內空氣質素中心"
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Indoor
Air Quality IAQ Assessment methods |
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| Referring
to the Guidance Note form EPD, there are basically two types
of assessment methods, namely real-time and integrated
sample. Real-time monitors can be used for detection of
pollutant sources and provide information on the variation of
pollutant levels throughout the day. Integrated
samples, normally obtained during the 8 working-hours for
offices, can provide information on the total exposure level
of a particular pollutant. Regardless of the choice of the
method, it is very important to ensure proper operating of the
equipment and handling of the samples, as well as stringent
quality assurance procedures including equipment calibration
in accordance with the manufacturer’s recommendations,
duplicate, field and shipment blank samples. A reasonableness
checklist should be formulated for the instrument operator in
the field so that any abnormality readings could be detected
instantly |
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Number
of Sampling Points
For
IAQ assessment, the guidelines for the minimum required number
of sampling points are given in bellows table
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Area
of Building (m2)
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Minimum
Number of Sampling Points
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3,000 - < 5,000
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8
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5,000 - < 10,000
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12
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10,000 - < 15,000
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15
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15,000 - < 20,000
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18
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20,000 - < 30,000
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21
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30,000 or more
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25
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For
interpretation of indoor measurement results, outdoor air quality
should be monitored in parallel in close proximity to the fresh air
intakes of the study areas. Monitor inlets and sensors should be
located approximately 1 metre off the edge of the duct inlet. If the
monitors and sensors are placed outdoor, they must be enclosed in an
appropriate shelter to shield from direct sunlight and moisture. |
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| General
Guidelines for Siting Indoor Monitoring Locations from GN |
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During
field data collection, monitors should be sited at the
selected location using the following general guidelines
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*
Representative to the primary workstation layout and work
activities
* Selected to minimise impact on work activities
within the study area
* At least 0.5 metre from corners or windows
* At least 0.5 metre from walls, partitions, and other
vertical surfaces (e.g. file cabinets)
* Not be directly under or in front of air supply
diffusers, induction units, floor fans, or heaters, etc.
* Not be where direct sunlight will impact
instrumentation
* Hallways or
passageways are not preferred
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*
Not be within 1 metre of localised sources such as
photocopiers, printers, cigarette smokers, etc.
* Not obstruct or interfere with occupant egress from
the study area under normal or emergency situations
* Inlets of samplers
should be placed at a height of 1.1 m above the floor; except
for temperature and air motion, which should be measured at
the 0.1, 0.6, and 1.1m levels for sedentary occupants.
Standing activity measurements for temperature and air motion
should be made at the 0.1, 1.1, and 1.7m levels.
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本中心提供室內空氣質素測試, 協助申請政府部門認可之測試報告及註冊工程師簽處之室內空氣質素証書.
提供專業意見, 協助改善室內空氣質素及辨理申請於政府部門註冊証書.
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Copyright @ 2017 Indoor Air Quality Centre "室內空氣質素中心" |
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