PSI - Issue 44

Silvia Caprili et al. / Procedia Structural Integrity 44 (2023) 1030–1037 Silvia Caprili et al. / Structural Integrity Procedia 00 (2022) 000–000

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Fig. 4 External temperature trend and heat transferred by conduction trough the inner surface of (a) the Nord wall during the coldest week of the TMY and (b) the Sud wall during the warmest week of the TMY.

Table 4. PMV index - winter coldest week. Winter week Day (Pre)

Day (Post)

Night (Pre)

Night (Post)

02-19 02-20 02-21 02-22 02-23 02-24 02-25

-0.50 -0.70 -0.70 -0.70 -0.80 -0.80 -0.70

-0.40 -0.60 -0.50 -0.60 -0.60 -0.70 -0.60

-1.0 -1.0 -1.0

-1.0 -0.9 -0.9 -1.0 -1.0

-1.10 -1.10 -1.20 -1.30

-1.10 -1.20

During the summer season the analyses, according to (BS EN ISO 15251, 2007) have been performed in 'free running' condition and results have been discussed based on the Adaptive Model. The operating temperature, key factor of the Adaptive Model for the perception of comfort or discomfort, has been obtained from the model. The intervention basically leaves the internal operating temperature values unchanged. The obtained results are to be considered indicative of a preliminary study (no solar shading systems are considered; the whole building was divided into just two thermal zones etc.). Nevertheless, it is certainly possible to remark that, in the face of an increase in the vertical wall’s insulation, there was no significant rise in the indoor operating temperatures, so there should not be any risk of overheating during the summer season. Finally, local thermal comfort was analyzed trough the evaluation of the internal surface temperatures of the four walls, which compose the simplified model. Post-intervention, the temperatures of the four fronts are much more uniform among themselves, both in the winter that in summer season. Uniformity of all surface temperatures, within an environment, reduces the presence of radiant asymmetries and possible convective phenomena leading to the formation of air currents. Both factors could contribute to the creation of local discomfort situations, especially perceptible by people who perform sedentary activities. The analyses have thus confirmed the benefit of having a high thermal mass and insulated external wall for both global and local indoor thermal comfort. 4. Conclusions Existing building stock is often characterized by low structural and seismic safety and poor energy performance. Their conservation and renovation have become a key element to meet the structural and energy standards required