Case Studies
Single Family House Renovation, Papagou
Papagou, Greece
Code: CS2
Original situation
A 1970s single family house with a treated floor area of 150m2, an uninsulated brick façade, 20m of balconies, a flat, uninsulated roof and a floor slab that is 2.4m above ground. The windows are double-glazed with aluminium frames that are not thermally broken. The building is quite leaky with an airtightness level of n50 8 ACH (as compared to 0.6 ACH for the Passive House Standard).
Renovation approach
Retrofit completed. Monitoring post-renovation is now underway.
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 15 and the cooling demand by a factor of 6.
PHPP verification sheet before retrofit
| TFA | existing treated floor area (usable floor space) |
150.0 m2 |
|---|---|---|
| Space heating | Heating demand |
531.0 kWh/(m2a) |
| Heating load |
239.0 W/m2 |
|
| Space cooling | Cooling & dehum. demand |
101.15 kWh/(m2a) |
| Cooling load |
111.0 W/m2 |
|
| Frequency of overheating (> 25 °C) |
– % |
|
| Frequency of excessively high humidity (> 12 g/kg) |
0.1 % |
|
| Airtightness | Pressurization test result n50 |
8.0 /h |
| Non-renewable Primary Energy (PE) | PE demand |
777.0 kWh/(m2a) |
| Primary Energy Renewable (PER) | PER demand |
1386.0 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) |
150.0 m2 |
|---|---|---|
| Space heating | Heating demand |
35.18 kWh/(m2a) |
| Heating load |
21.0 W/m2 |
|
| Space cooling | Cooling & dehum. demand |
17.51 kWh/(m2a) |
| Cooling load |
15.0 W/m2 |
|
| Frequency of overheating (> 25 °C) |
– % |
|
| Frequency of excessively high humidity (> 12 g/kg) |
0.0 % |
|
| Airtightness | Pressurization test result n50 |
1.0 /h |
| Non-renewable Primary Energy (PE) | PE demand |
103.0 kWh/(m2a) |
| Primary Energy Renewable (PER) | PER demand |
57.0 kWh/(m2a) |
| Generation of renewable energy (in relation to projected building footprint area) |
– kWh/(m2a) |
|
| EnerPHit classic |
yes |
Video
Key facts
Building typology
Two family house
Existing treated floor area (usable floor space)
150 m2
Building owner
Aris Georgopoulos
Consulting outphit partner
HPHI
Project status
Certified
Overall budget
80 000 €
Contact
Sofia Piperou
Hellenic Passive House Institute (HPHI)
Phone: +30 211 4081109
E-Mail: info@eipak.org