Table 2. Ventilated skins: steady state...

Table 2.

Ventilated skins: steady state and dynamic thermal parameters

Thermal properties	VF typology
Thermal properties	EM	IM	IEM
Thermal transmittance U (W/m²K)^a,^b	0.196	0.184	0.185
Surface mass Ms (kg/m²)^b	116	206	131
Decrement factor f^b	0.096	0.053	0.072
Time lag t (h)^b	12.43	16.77	15.04
Periodic thermal transmittance Y₁₂ (W/m²K)^b	0.019	0.010	0.013

Thermal properties	VF typology
Thermal properties	EM	IM	IEM
Thermal transmittance U (W/m²K)^a,^b	0.196	0.184	0.185
Surface mass Ms (kg/m²)^b	116	206	131
Decrement factor f^b	0.096	0.053	0.072
Time lag t (h)^b	12.43	16.77	15.04
Periodic thermal transmittance Y₁₂ (W/m²K)^b	0.019	0.010	0.013

Notes:

Calculated according to ISO 6946:2008 (International Organization for Standardization, 2008a) U < 0.26 W/m²K according to the Italian regulation on energy efficiency (D.M. 2015) (M. of I. E. Development, 2015).

Calculated according to EN ISO 13786:2008 (International Organization for Standardization, 2008b), considering a well-ventilated facade by disregarding the outer layer

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