Case Studies
Renovation of a three storey building, Maroussi
Maroussi, Greece
Code: CS4
Original situation
A 1970s three family apartment with 312m2 of treated floor area, an uninsulated roof, 50m of balconies and an only lightly insulated brick façade. The windows are double-glazed with aluminium frames that are not thermally broken. The building has a low airtightness level of n50 = 5 ACH (as compared to 0.6 ACH for the Passive House Standard).
After completion, the building will be the first multifamily EnerPHit in Athens.
Modernisation proposal
EnerPHit Energy Demand Method. This means that we will achieve EnerPHit level energy demanf (25 kWh/m2a) certification by insulating the entire envelope, minimsing existing themal bridges, replacing windows, improving airtightness and installing mechanical ventilation with heat recovery.
Efficiency improvement
Renovation will reduce the heating demand by factor of 10 and the cooling demand by a factor 3.
PHPP verification sheet before retrofit
| TFA | existing treated floor area (usable floor space) |
312.0 m2 |
|---|---|---|
| Space heating | Heating demand |
143.12 kWh/(m2a) |
| Heating load |
72.0 W/m2 |
|
| Space cooling | Cooling & dehum. demand |
30.44 kWh/(m2a) |
| Cooling load |
35.0 W/m2 |
|
| Frequency of overheating (> 25 °C) |
– % |
|
| Frequency of excessively high humidity (> 12 g/kg) |
0.0 % |
|
| Airtightness | Pressurization test result n50 |
8.0 /h |
| Non-renewable Primary Energy (PE) | PE demand |
365.0 kWh/(m2a) |
| Primary Energy Renewable (PER) | PER demand |
221.0 kWh/(m2a) |
| Generation of renewable energy (in relation to projected building footprint area) |
– kWh/(m2a) |
|
| EnerPHit classic |
no |
PHPP verification sheet after retrofit
| TFA | existing treated floor area (usable floor space) |
312.0 m2 |
|---|---|---|
| Space heating | Heating demand |
15.12 kWh/(m2a) |
| Heating load |
11.0 W/m2 |
|
| Space cooling | Cooling & dehum. demand |
12.21 kWh/(m2a) |
| Cooling load |
9.0 W/m2 |
|
| Frequency of overheating (> 25 °C) |
– % |
|
| Frequency of excessively high humidity (> 12 g/kg) |
3.0 % |
|
| Airtightness | Pressurization test result n50 |
0.9 /h |
| Non-renewable Primary Energy (PE) | PE demand |
74.0 kWh/(m2a) |
| Primary Energy Renewable (PER) | PER demand |
43.0 kWh/(m2a) |
| Generation of renewable energy (in relation to projected building footprint area) |
– kWh/(m2a) |
|
| EnerPHit classic |
no |
Key facts
Building typology
Multi family dwelling
Existing treated floor area (usable floor space)
312 m2
Building owner
Spyros Mavromatis
Consulting outphit partner
Hellenic Passive House Institute (HPHI)
Project status
Finished
Overall budget
98 000 €
Contact
Alexandra Mangina
Hellenic Passive House Institute (HPHI)
Phone: +30 211 4081109
E-Mail: info@eipak.org