The first step was the application of several building envelope
improvement measures and substitution of mechanical systems.
Through dynamic simulation it was possible to determine the
influence of the energy measures regarding the overall building
energy performance, as shown in Table 2 (case study 1) and Table 3
(case study 2).
The second step was the use of two on-site renewable sources,
in order to suppress the remaining energy needs of the retrofitted
building:
Case study 1 (single-family building)
• Solar collector panels for domestic hot water (DHW): collector
area of 3.8 m2 associated with a 300 l deposit, which resulted in
the supply of 2058 kWh/year of energy for DHW;
• Photovoltaic panels: collector area of 8.3 m2 and a nominal power
of 1.05 kW, which resulted in the production of 1312 kWh/year
of electrical energy.
Case study 2 (multi-family building)