One can now appoint the density as 1,20 kg/m 3 and there will be about 7,3 g of water per kg of air. Example: at a temperature of 20 ☌, the relative humidity is measured 50%. Naturally, this can all be controlled by a Mollier diagram. When air is heated, but not moisturized, relative humidity will decrease, whereas the number of grams of H 2O per kilogram remains the same.Īnother example: how much water vanishes from a smokestack which emits 80,000 Nm 3/hour of water-saturized air (100% RH) that has a temperature of 75 ☌? (answer = 31,394 litres/hour – or a reversed waterfall). Principally, when air is warmer, it can contain more fluids. When it is raining, relative humidity draws near 100% and when it is a cold day, relative humidity is very low. This data is based on estimates, because relative humidity cannot be measured accurately in outside air.
Humans feel their best at a relative humidity of 40% or above.
There appears to be a direct relation between relative humidity and phsychological wellfare of humans. For example, in winter at an outside temperature of -10 ☌ and a relative humidity of 30%, one wishes to create a satisfactory indoor climate (such as 20 ☌ and a minimal relative humidity of 40%). In practise, one should adopt a worst-case scenario. How much moist must be added to this air? must be added.Īccording to this method, one can determine how much moist a moisturizer must spray. Imagine: there is a building in which % of the air is recycled and is refreshed by outside air. Which equals for the space mentioned above:Īt an adopted weight of one cubic metre of air of kg/m 3, needs to be added to the air within the room to achieve the above-mentioned relative humidity. Required amount of H 2O (gram) per kg air to reach the desired Setpoint relative humidity inside closed space: With the following fields you can calculate the (new) relative humidity is the outside air is heated in a closed space (room, office, factory hall e.g.).:Ĭalculated relative humidity inside closed space:
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