Post by account_disabled on Feb 19, 2024 2:15:35 GMT -5
One of the aspects to evaluate when designing the composition of a façade is : What is the ideal position of the insulation? Does it influence the risk of condensation formation? In this post we do an analysis for three types of façade with the same composition but with different location of the insulation: without and with insulation in the chamber and on the outside. Participate with your comments and share on social networks.
thermal resistance envelope enclos
To what extent does SATE reduce the risk of condensation formation?
It is enough to do some minimal calculations to know how the risk of condensation formation is reduced by adding SATE to a façade. To carry out these calculations we go as always to the document DA DB-HE/ . This document proposes two methods for calculating the risk of condensation formation . One for superficial condensations. Another for interstitial condensations.
To carry out the calculation we start Phone Number List from a double-leaf enclosure with an air chamber without thermal insulation . This façade is improved by filling the chamber with thermal insulation and with SATE. The thermal transmittance values for each of the facades are as follows:
Enclosure without insulation. U = W/m²k.
Enclosure with insulation in existing cm chamber. U = W/m²k.
Enclosure improved with cm of SATE. U = W/m²k.
Reduces the risk of interstitial condensation formation
In a non-insulated enclosure, the temperature distribution along its section is modified when thermal insulation is added. And said temperature distribution will depend on the place where the insulation is incorporated. The further outward, the higher the temperature in your section. We calculate the temperature distribution for the following conditions:
Outside temperature: °C.
Indoor temperature: °C.
Outdoor relative humidity: %.
Indoor relative humidity: % (Hygrometry class or lower).
Temperature distribution
temperature distribution formation of condensation
As can be seen in the graph, the temperature distribution changes quite a bit from one enclosure to another, depending on the position of the thermal insulator in the construction section of the façade . Arranging the insulation in a chamber (red line) is not the same as arranging it outside (green line).
When the insulation is placed outside, the temperature in each layer is higher, compared to the rest of the construction solutions, therefore the risk of interstitial condensation formation is reduced. We must not forget that one of the conditions to avoid the formation of condensation is that the temperature is higher than dew point.
thermal resistance envelope enclos
To what extent does SATE reduce the risk of condensation formation?
It is enough to do some minimal calculations to know how the risk of condensation formation is reduced by adding SATE to a façade. To carry out these calculations we go as always to the document DA DB-HE/ . This document proposes two methods for calculating the risk of condensation formation . One for superficial condensations. Another for interstitial condensations.
To carry out the calculation we start Phone Number List from a double-leaf enclosure with an air chamber without thermal insulation . This façade is improved by filling the chamber with thermal insulation and with SATE. The thermal transmittance values for each of the facades are as follows:
Enclosure without insulation. U = W/m²k.
Enclosure with insulation in existing cm chamber. U = W/m²k.
Enclosure improved with cm of SATE. U = W/m²k.
Reduces the risk of interstitial condensation formation
In a non-insulated enclosure, the temperature distribution along its section is modified when thermal insulation is added. And said temperature distribution will depend on the place where the insulation is incorporated. The further outward, the higher the temperature in your section. We calculate the temperature distribution for the following conditions:
Outside temperature: °C.
Indoor temperature: °C.
Outdoor relative humidity: %.
Indoor relative humidity: % (Hygrometry class or lower).
Temperature distribution
temperature distribution formation of condensation
As can be seen in the graph, the temperature distribution changes quite a bit from one enclosure to another, depending on the position of the thermal insulator in the construction section of the façade . Arranging the insulation in a chamber (red line) is not the same as arranging it outside (green line).
When the insulation is placed outside, the temperature in each layer is higher, compared to the rest of the construction solutions, therefore the risk of interstitial condensation formation is reduced. We must not forget that one of the conditions to avoid the formation of condensation is that the temperature is higher than dew point.