External Thermal Insulation Composite Systems: Critical Parameters for Surface Hygrothermal Behaviour

Table 3

Surface transfer coefficients in numerical simulations.

Surface transfer coefficients
Exterior convective heat transfer coefficient (W/m^2·K)	Leeward: 𝛼𝑐=0.33×𝑣wind+4.5; Windward: 𝛼𝑐=0.16×𝑣wind+4.5
Short-wave radiation absorbance (exterior rendering)	0.35
Long-wave radiation emissivity (exterior rendering)	0.85 (measured value)
Long-wave radiation emissivity (ground)	0.90 (measured value)
Short-wave radiation reflectance (ground)	0.20
Long-wave radiation reflectance (ground)	0.10
Interior heat resistance (m^2·K/W)	0.125
Rain absorption factor	0.70