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Article | REF: BE8025 V2

Moist Air. Basics and measurement

Authors: Bernard CRÉTINON, Bertrand BLANQUART

Publication date: December 10, 2017 | Lire en français

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    4. Hygrometers used in air treatment

    Air humidity is one of the parameters to be controlled in order to achieve comfort conditions in an air-conditioned room: the American standard ASHRAE 55-2004 recommends keeping relative humidity within a range of 30-60% RH. Lower values can cause irritation to the respiratory system, while higher values lead to a harmful attenuation of perspiration.

    However, this requirement is not very stringent, and for a long time we were content with basic means of controlling relative humidity. But when it comes to energy consumption, a quick calculation shows how important it is to ensure proper humidity control.

    Example

    Let's assume that we wish to maintain 40% relative humidity and a temperature of 19°C in the room, for an outside...

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