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January 9, 2017

Ventilation paradigms and rates in history!


In late 20th century, oil shock focusses attention on energy, that is pushing for thighter envelopes and push for lower ventilation.  Also the International Energy Agency was created and new producs appear indoors. This all have unintended consequences on indoor air quality (IAQ) and this why we need to know why we ventilate now.

Ventilation for comfort

We ventilate for comfort (IEQ not IAQ) and we need to prevent overheating by venting the excess heat. Air movement makes us feel cooler. We also need to control odor. Occupants are actually the best “sensors”, because they can also take actions to change the indoors situation.

Key odor is us

People emit “human bioeffluents”. Daily hygiene of Western World includes 2,5 l/s for adapted occupants and 7,5 l/s for unadapted visitors. Odor dominates in high-density spaces.

Source: presentation on “Smart Ventilation” by Max Sherman from University of Nottingham.

More about ventilation history