Ventilation number

A room’s overall air volume flow can also be determined as a first approximation by using the ventilation rates. This in particular is “only” permissible in ventilation systems who do not require any particular air conditioning regarding humidity and temperature and air replacement is mostly covered by a sufficient outdoor air rate.

The ventilation rate specifies how many times per hour the room volume is turned over (replaced). According to room use and the desire for air replacement, the ventilation rate varies (table).

Table 3.157: Examples for ventilation rates

Example
A double-axis office with a floor space of 26 m2 and a room height of 2.8 m has a room volume of 72.8 m3. The ventilation rate (see table) is selected as z = 5. This means an hourly air volume of 364 m3 to be turned over. Divided by 4 luminaires (equipped with 1 x 58 W fluorescent lamps each for an average working area illuminance of ca. 500 lx), the air volume flow per luminaire is 91 m3/h. The outdoor air rate with two persons in the room is 80 m3/h, i.e. the outdoor air portion is ca. 22%.

Table 3.158: Minimum outdoor air rate in relation to persons/area
Air flow capacity
3.2.1.17.3 Pressure drop

SUBJECT SEARCH

  1. Luminaires
    1. Luminaires
    2. The enhanced concept of quality
    3. Photometric classification
    4. Photometric properties
    5. Photo biological safety
    6. Mounting and electrical connection
    7. Luminaire labelling
    8. Luminaire operation
    9. LED luminaire operation
    10. Operation of FL luminaires
    11. Electrical safety
    12. Fire protection
    13. Electromagnetic safety
    14. Mechanical safety
    15. Chemical and miscellaneous impact
    16. Acoustic properties
    17. Ventilation properties
      1. Lighting heat
      2. Ventilation number
      3. Pressure drop
  2. Specific requirements on luminaires
  3. Luminaire selection
  4. Light management
  5. Light sources
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