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> What's Humidity?
> How to prevent humidity build-up?
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The subject of “humidity” is often misunderstood. This is due to the common use by weather reporting media of the word “humidity” to refer to level of comfort in a natural outdoor environment. It forms in our mind immediately that high humidity is synonymous with discomfort. That is not necessarily true.
Technically, “humidity” exists as either relative humidity (%) or absolute humidity (g/kg of dry air). A true understanding of these two terms only can help to evaluate whether the supply air poses a problem to your workspace.
In workspace cooling, the perceived concern of humidity build-up of the supply air to cause discomfort to the workers or adverse effect on theproduct produced is understandable. We will attempt to explain in the following section “ How to prevent humidity build-up”.
 
Relative humidity (RH) in % is the ratio of the actual amount of water vapor in the air to the amount it could hold when saturated .
Absolute humidity (AH) in g/Kg of dry air is the mass of water vapor in a unit volume of air. It is a measure of the actual water vapor content of the air.
 
The psychrometric to the right provides an better understanding of the two terms used. If we take a typical situation where air is cooled from Point A to B. The temperature drops from 33.5 °C to 27.9 °C and the relative humidity (RH) increases from 58% to 89%.
This increase in RH appears to be alarming. However, if we look at the increase in absolute humidity (AH) which is also known as moisture content, the increase is only 2.3 g/Kg (from 20.0 to 23.5 g/Kg). An increase in moisture content of this order or even a little higher will not likely to affect most products or machine components in the workspace. When it rains outside, the moisture content of the air is also around this level in our South East Asian climates.
What is important is the increase in moisture content should not allowed to keep building up inside the workspace. This subject is discussed in the next section “How to prevent humidity build-up”.
 
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Thai Waterline Systems Co., Ltd.
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