Research Article
External Thermal Insulation Composite Systems: Critical Parameters for Surface Hygrothermal Behaviour
Table 5
Relevance of the parameter values and expected variations in terms of surface condensation (
), WDR, and drying process (
).
| | Parameter | Initial situation | Variation | Relevance | | C | WDR | D |
| | Properties of the exterior layer | | | | | | | Moisture diffusivity, in (m2/s) | 0 | 0.0013* | # | # | # | | Water vapour diffusion resistance factor | 25 | 1000 | # | # | # | | Emissivity (Figure 11) | 0.85 | 0.60 | ### | # | # | | Absorbance to solar radiation (Figure 12) | 0.35 | 0.50 | # | # | ## | | Thickness, in (m) | 0.005 | 0.02 | # | # | # | | Characteristics of the façade | | | | | | | Orientation (Figure 13) | W | N; E; S | # | ## | ## | | Height of the building (Figure 14) | Tall | Small | # | ### | # | | Total thermal resistance (Figure 15) | = 0.04 m | = 0.06 m | ## | # | # | | Exterior climate | | | | | | | Temperature, in (°C) (Figure 16) | | | ### | # | # | | Relative humidity, in (%) (Figure 17) | | | ### | # | # | | Solar radiation, in (W/m2) (Figure 18) | | | # | # | ## | | Atmospheric radiation, in (W/m2) (Figure 19) | | | ### | # | # | | Wind velocity, in (m/s) (Figure 20) | | | # | ## | # | | Wind direction, in (°) | | | # | ## | # | | Rain, in (mm) (Figure 21) | RainPorto | 0.20 × RainPorto | # | ### | # | | Interior climate | | | | | | | Temperature, in (°C) (Figure 22) | 20 | 22 | ## | # | # | | Relative humidity, in (%) | 60 | 65 | # | # | # |
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For moisture content at 80% of RH (WUFI database).
Scale: #Low. ##Medium. ###High.
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