Case Studies

Renovation of a three storey building, Maroussi

Maroussi, Greece

Code: CS4

View from the outside
© HPHI

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). 

Renovation approach

Under costruction:

New windows and blinds have already been installed. The external insulation and ventilation system will be installed and commissioned soon. The postmoitoring is being planned at the moment as well.

 

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 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)

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

221,0 kWh/(m2a)

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)

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

43,0 kWh/(m2a)

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

Planning phase

Overall budget

98 000 €

Contact

Alexandra Mangina
Hellenic Passive House Institute (HPHI)
Téléphone: +30 211 4081109
E-Mail: info@eipak.org