nZEB Examples: Technical Details

Based on the Passive House Standard:

Heating demand - 15 kWh / (m2a) calculated according to PHPP
Heating load - 15W/m2

Cooling/dehumidification needs - 14 kWh / (m2a) calculated according to PHPP
Cooling load - 10W/m2

Airtightness - n50 = 0.58/h

PER demand (renewable primary energy) - 29 kWh / (m2a) for heating, hot water, auxiliary and household electricity calculated according to PHPP
Generation of renewable energy - 136 kWh / (m2a) reference to built-up area

PE requirements (non-renewable primary energy) - 59 kWh / (m2a) for heating, hot water, auxiliary and household electricity calculated according to PHPP

Primary energy consumption: 108kWh/m2year
Building tightness: 0.56/h
CO2 emissions: 12 kgCO2/m2year
Renewable share of energy: 34%

Primary energy consumption: 96 kWh/m2year
Building tightness: 0.28/h
CO2 emissions: 11 kgCO2/m2year
Renewable share of energy: 50%

Primary energy consumption (includes RES): 77kWh/mp/year
Building tightness: 1 ACH@50Pa
CO2 emissions: 9 kgCO2/mp/year
Renewable share of energy: 60%

Primary energy consumption (includes RES): 71kWh/mp/year
Building tightness: 1 ACH@50Pa
CO2 emissions: 9 kgCO2/mp/year
Renewable share of energy: 51%

So far, the simulation with the best values was the house with LSF structure and ICB insulation 10cm on the outside and 10cm of rock wool on the inside.

Energy needed for heating: 12,31 kWh/(m2a)
Energy needed for cooling: 7,92 kWh/(m2a)
Building tightness: n/a
CO2 emissions: on going
Embodied energy: on going

The energy nZEB performance of SolarXXI can be considered as a reference year:
▪ Electric consumption: 22 kWh/m2.year
▪ Renewable electricity: 32kWh/m2.year taking into account all 3 PV systems.

Final energy consumption for heating and ventilation: 6.9 kWh/m2/a

Building part / RIC Pro-Akademia / National requirements for nZEB binding from 01/01/2021
External walls / 0.085 / 0.200
Roof / 0.085 / 0.150
Floor on the ground / 0.114 / 0.300
Windows / 0.800 / 0.900