Case Studies

Single Family House Renovation, Papagou

Papagou, Greece

Code: CS2

View from the outside
© HPHI
New PVC window installation
© HPHI
New PVC window installation
© HPHI

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

Currently, the monitoring setup is being planned and implemented. Soon, the ventilation system will be commissioned and a Blowerdoor test will be used to proof the building's airtightness.

Renovation approach document

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)

Generation of renewable energy (in relation to projected building footprint area)

1386,0 kWh/(m2a)

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)

Generation of renewable energy (in relation to projected building footprint area)

57,0 kWh/(m2a)

Video

Click to view via Youtube (Google)

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

Construction phase

Overall budget

80 000 €

Contact

Sofia Piperou
Hellenic Passive House Institute (HPHI)
Telefon: +30 211 4081109
E-Mail: info@eipak.org