B.6. Calculations of water vapour condensation in partition <br>

B.6. Calculations of water vapour condensation in partition

Process of heat penetration through building partitions is connected with the process of water vapour penetration and:

- building materials are porous and to some extend they allow the water vapour penetration. This feature is characterized by coefficient of water vapour diffusion resistance.

- during winter season (heating season) as a result of humidity precipitation in compartments (in various processes of man’s activity) the partial pressure of water vapour in the air is higher than the partial pressure of water vapour in the air outside the buildings. For this reason the penetration of water vapour through building partitions is realized always in direction from compartment to the outside and its amount depends on thickness and vapour conductivity coefficients of partition layers as well as the difference of partial pressures of water vapour inside and outside the compartment.

In multi-layer partitions can occur a phenomenon of water vapour condensation in this partition. Because of disadvantageous results of condensation (intensification of stream of heat permeating through this partition, its destruction) it is necessary to apply such partition construction, in which the condensation humidity could evaporate in summer season and the partition could be dried.