User Manual
Table Of Contents
- 1 Purpose of this document
- 2 Why is a healthy, productive indoor climate so valuable?
- 3 The role of building automation in health and productivity
- 4 Control applications and targets (CO2, VOC, RH, PM2.5)
- 5 Recommendations for specific building types
- 6 Monitoring indoor climate parameters for health and productivity
- 7 Controlling indoor climate parameters for health and productivity
- 8 Products for a healthy productive indoor climate
- Appendix 1: Indoor air quality (IAQ) – Combined CO2 and VOC sensors
- Appendix 2: Integration of RDF../RDG.. (KNX) in Desigo
- Appendix 3: Other indoor climate parameters – NO2, SO2, O3
- Appendix 4: Tender texts
- External references
- Siemens reference documents
- Glossary
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Appendix 3: Other indoor climate parameters – NO2, SO2, O3
The air quality index (AQI) is used as an overall guide to the level of air pollution. It is based
on measured values of PM2.5, PM10, NO
2, O3, SO2 and CO. So why do we monitor and
control PM2.5, PM10, CO
2 and VOC, but not NO2, SO2 and O3?
CO
2 and VOC are generated mainly inside buildings, while NO2, O3, and SO2 come mainly
from outside, that is, from industrial processes and vehicles. PM2.5 and PM10.5 come from
both indoor and outdoor sources. CO
2, VOC and PM2.5 can be monitored and controlled
indoors: CO
2 and VOC via ventilation, and PM2.5 by filtering and also by controlling the
ventilation.
NO
2 is synthesized from NO which comes mainly from vehicles and industrial processes such
as power generation. NO is transformed into NO
2 via natural processes in the atmosphere
outdoors (note: NO
X means oxides of nitrogen, such as NO2 and NO). NOX can be monitored,
but in practice cannot be controlled in the room as the AHU filters have no effect on it
1
. It can
only be controlled at source (e.g. by activated carbon method in the chimney). Therefore,
specific NO
X room sensors (for room climate control) are not needed
2
.
O
3, like NO2, is a secondary pollutant and can be monitored (by proxy) by monitoring NOX.
Additionally, O
3 is unstable and quickly decomposes to O2 at normal room temperatures and
is not normally a problem indoor.
SO
2 has become much less of a problem over recent years. It comes mainly from burning coal,
and this is being substantially reduced in most parts of the world.
CO is mainly an issue in underground car parks and kitchens, and in residential buildings with
fuel burning boilers or stoves. Mostly it is monitored with an alarm sounded if the level is too
high. It is potentially dangerous, but not an issue for everyday health.
1 NOX is contributing to the VOC sensor signal; thus it is to some extent measured indirectly
2 The filter specialist Mann und Hummel offers a filter that is claimed to be effective on both PM2.5 and NO2