Design heating load in a nZEB in Mediterranean climate: discussion about monitoring data

The paper proposes a discussion about the operational performance of an existing nearly zero energy building in the Mediterranean climate, during the heating season. The required electric power for variable winter conditions is analyzed and it is compared with design calculation, under stationary conditions. Indeed, the indoor and outdoor conditions, during the real operating mode, could be quite different compared to the ones adopted during the design period, also because of the progressive climate change. Thus, it is important to understand if the building-HVAC system is able to meet the variable conditions that can occur and what is the difference that could happen during the sizing of the systems for the microclimatic control.