In this case, almost 48 h were necessary (DT stabilizing, Fig. 7)
to stabilize the interior temperature at 20 C of the confined room.
Meanwhile, the exterior temperature had shown its natural and
expected swing in a day time (e.g. DTnight and DTday, Fig. 7). For
that period of the year, in the north region of Portugal, the exterior
temperature was always lower than the interior temperature.
Therefore, adequate thermal gradients were guaranteed (e.g. details
I and II, Fig. 7).