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Relative humidity as the main signal for comfort indoors!
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February 26, 2021

Relative humidity as the main signal for comfort indoors!

Requirements for relative humidity!

Humidity definition dates back to the 1300s and is widely proved to be one of the important factors in buildings. Together with temperature, relative humidity is always given in absolute or relative terms (in percentage or as water content, as dew-point, dampness or with humidification/dehumidification, etc.). However, the requirements for relative humidity in current building standards are very limited.

Current building standards still focus on rather a simple linear relationship between the outdoor temperature and indoor comfort temperature, assuming to sufficiently explain the effect of all other variables, e.g. relative humidity (RH) and air velocity. However, the lack of a signal for relative humidity is particularly surprising, given its well-known impact on comfort.

A little water goes a long way!

Humidity levels between are 40-60% RH also key for building constructions, materials and equipment in buildings. Do you know about the Sterling´ chart ( optimal humidity range for minimising adverse health effects) and Mollier diagram (graphic representation of the relationship between air temperature, moisture content and enthalpy)?

Want to know more about the effects of relative humidity?

Download free white paper on relative humidity by Swegon (Swegon link here).

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