Abstract
This chapter introduces the main parameters that govern the thermal behavior of the external envelopes in new highly insulated buildings. In particular it identifies the internal areal heat capacity κ1 and decrement factor f as the main influencer of the summer behavior, while the steady state thermal transmittance U and the decrement factor f of the winter performance. Combined limit values for κ1 and f are proposed. Moreover the different impacts of these parameters at the varying of some feature, such as the exposed envelope area, the presence of shading/overhangs, the user behavior regarding the heating plants operation profile, the natural cross-ventilation, and the climate zone are outlined. The chapter includes experimental measures on a vernacular building with different mass at the two levels and ends with an experimental evidence of the importance of the occupants’ behavior.
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