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Concept
Humidifier
Summary
A humidifier is a household appliance or device designed to increase the moisture level in the air within a room or an enclosed space. It achieves this by emitting water vapor or steam into the surrounding air, thereby raising the humidity levels.
In the home, point-of-use what humidifiers are commonly used to humidify a single room, while whole-house or furnace humidifiers, which connect to a home's HVAC system, provide humidity to the entire house. Medical ventilators often include humidifiers for increased patient comfort. Large humidifiers are used in commercial, institutional, or industrial contexts, often as part of a larger HVAC system.
Humidity per hour: X = Air changes per hour (ACPH) * M3 * density of air * humidity ratio
Humidity per day: X * 24
The air changes per hour (ACPH) ranges wildly based on:
Ventilation: Values may be obtained from the HVAC maintainer that routinely (typically every third year or so) tests the ventilation of the residence.
Insulation leakage: Measured with a standard blower door test.
Cubic meters: The volume of the room, excluding the bathroom that should be kept closed since it ventilates humidity.
Density of air: Typically 1.2 for dry air.
Humidity
Current relative humidity: 20%
Humidity needed to reach 55%: 35%
Humidity ratio for 35%: 0.0051
For example, a typical modern apartment of with closed windows (wood isolation) may consume to raise the relative humidity from 20% to 55%: 24 * 1,53 L/h (2*1×125×1.2×0.0051):
Air changes per hour
Ventilation: 2
Insulation leakage: 1 (a few windows)
Cubic meters: 125 m3 (50 m2 * 2.5 m height)
Density of air: Typically 1.2 for dry air.
Humidity
Current relative humidity: 20%
Humidity needed to reach 55%: 35%
Humidity ratio for 35%: 0.0051
Low humidity may occur in hot, dry desert climates, or indoors in artificially heated spaces. In winter, especially when cold outside air is heated indoors, the humidity may drop to as low as 10–20%. A relative humidity of 30% to 50% is recommended for most homes.
Official source
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