Case 7: Residential apartment in Attica Region

Greece

Case parameters 1

Type of construction: Renovation
Typology: Residential apartment of 108.3 m2, constructed in 1971. Electrical cooling system, Fossil fuels usage for heating. The unit has an energy label D.

Owner: Private

Construction systems: Reinforced concrete

Location: Attica, Greece

 

Case parameters 2

Type of construction: Renovation

Typology: Residential detached house of 109,0 m2, constructed in 1989. The unit has an energy label D.
Owner: Private
Construction systems: existing low thermally insulated family house

Location: Attica, Greece

The challenge we faced

More than 40% of the total Greek population (about 4.0 mil of the 10.0 mil total) live in Attica region. Most residents live in buildings constructed before 1990, with low energy performance factors such as high energy use levels, insufficient ventilation, uneven indoor temperatures, and insufficient thermal comfort levels. Therefore, a deep level of renovation is required.
Given the fact that most of the buildings are privately owned and located in urban areas, it is almost impossible (due to the excessive bureaucracy) and very expensive solution to reconstruct new buildings. A major renovation of the existing buildings would be the only practical, cost-effective and low-energy solution.

What we did

For demo 1

1) Installation of PV cells in the roof (size: 25-30m2)

2) Battery box for energy storage

3) Optimization and monitoring system for PV production per module

4) Installation of heat pump

5) Heating autonomy per room with thermostatic head per radiator

 

For demo 2

1) Installation of an integrated thermal insulation system (installed on the external walls)-10 cm (recyclable material).

2) Installation of an integrated thermal insulation system (on the roof), (60% recycled glass)

The results we met

We met the following results in the Greek demonstration buildings:

Case-specific outcomes:

  • This kind of renovation offered a high energy performance improvement of around 60%
  • The estimated reduction of the CO2 emissions is 37% annually.
  • Improved public awareness on energy saving and efficiency and the additional benefits of these renovation process

Case-specific profits:

  • High energy use reduction
  • Lower cost for the users
  • Improved energy efficiency

Case-specific impact indicators

  • Reduced operational costs for the residents
  • Reduced maintenance and life cycle costs
  • Increased the value of the property
  • Extended the life cycle of the apartment
  • Improved comfort of living for the residents achieved by means of the insulated building envelope