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8. Air characteristics – Fundamentals
Extracts from G. Porcher's air conditioning course
Atmospheric air is made up of a number of gases, moisture, dust and bacteria. By definition, it's called polluted humid air.
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Dry air.
By convention, dry air is pure air containing no dust or bacteria, and totally devoid of humidity (table 17 ).
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Air characteristics – Fundamentals
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Standards and norms
New standards
- - NF EN ISO 7783-1 - 09.1999
- Détermination du coefficient de transmission de la vapeur d'eau. - NF EN ISO 7783-2 - 07.1999
The first describes the free-foil capsule method. The second determines and classifies water vapour transmission rate (permeability).
They now have the status of French standards and are part of the NF EN 1062-1 to 1062-11...
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