Where does moisture come from in the home.
Moisture is ubiquitous in the air.
In an apartment, if there is more of it than a person needs, it should be treated as an air pollutant. Remove excess by means of ventilation.
There are many sources of moisture in the apartment. It enters the room together with the outside air, it is also created as a result of activities performed by the household members. Bathing, washing and cooking produce the most water vapor. Also, all living organisms emit moisture as a product of metabolism.
Approximate intensity of steam release:
- sleep or rest 50 g/h
- light work 90 g/h
- hard work 150 g/h
- fast dance 340 g/h
- bath in a bathtub 1000-1100 g/h
- shower bath 1500-1700 g/h
- drying linen (one washing machine load) 2000 g/h
- cooking (one meal) 1000-2000 g/h
In a house of 120 m2 high by 2.5 m (300 m3) with an air temperature of 22 degrees C inside it contains:
- at a relative humidity of 25% (absolute humidity 5 g/m3) 1,5 liters of water,
- at 40% relative humidity (absolute humidity 8g/m3) 2,4 liters of water,
- at a relative humidity of 60% (absolute humidity 12g/m3) 3,6 liters of water.
It is worth adding that at -5 degrees C outside, each m3 of air contains over 3g of water. Based on these data, it can be seen that the comfortable ventilation of 20-30 m3/h per person does not dry the air, and the return of moisture to the house causes it to be diffused through partitions (external walls) in the periods of low external temperature or frost.
