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Drainage

Natural drainage


Not many people today are prepared to wait a year or even more for a new building to dry up naturally. Not to mention that this way of drying is very time consumable and it depends a lot from structure and thickness of building materials and from environmental conditions. For example a high relative air humidity (mostly summer months) slows down the process of natural drainage and makes it even more difficult. So instead of waiting we can choose an alternative method which is reliable and of course faster. If we don’t want to wait, we use artificial condense or adsorptive drainage method.

Artificial drainage

Artificial drainage is mostly as effective as natural drainage, but it is much less time consumable. The aim of artificial drainage is to increase ability of moisture reception out of building materials. There are two ways of achieving this:

  • Heating of humid air: The air is able to accept 3 g/m3 of water at 10 °C air temperature and at 70% relative humidity while on the other hand it is able to accept up to 16 g/m3 when heated to 25 °C
  • By drying up humid air: With dehumidification of the air to 30% of relative humidity a significant difference is achieved. If the room has 20 °C and 70% relative humidity, we are able to “seize” only 5g/m3 of water from the air while the number is 12 g/m3 when temperature is the same and air humidity is 30%. Since the cost of electricity is much higher at heating than at dehumidification process, one must optimize usage of proper equipment (heaters, dehumidifiers) to reach optimal results with minimum cost and time.