Human requirements to the indoor air quality and the thermal environment
Abstract
Perceived air quality, general thermal sensation of the occupants and risk of draft, aspects which human comfort in a space depends upon, are reviewed separately based on European Guidelines for Ventilation Requirements in Buildings and on a modified ISO (International Standards Organization) standard 7730 on thermal comfort. The perceived air quality is expressed in decipol or percentage of dissatisfied occupants. The general thermal sensation is expressed by the PMV/PPD indices. The perception of draft is expressed by the model of draft risk. Indoor air quality is mediocre and causes complaints in many buildings. The reason for this is often hidden pollution sources in the building, hitherto ignored in previous ventilation standards. To determine the required ventilation, a method is used in the European Guidelines. The new Guidelines acknowledge all pollution sources in the building, expressed in olfs. The method is based on the desired air quality in the space, the available quality of the outdoor air, the ventilation effectiveness and on the total pollution load in the space. The model of draft risk predicts the percentage of occupants feeling draft as a function of the mean air velocity, the turbulence intensity and the air temperature.
- Publication:
-
VKI Advanced Design of Ventilation Systems
- Pub Date:
- 1993
- Bibcode:
- 1993VADVS....Q....F
- Keywords:
-
- Air Quality;
- Comfort;
- Draft (Gas Flow);
- Indoor Air Pollution;
- Ventilation;
- Ambient Temperature;
- Human Factors Engineering;
- Requirements;
- Engineering (General)