Duplex Passive House in Sofia

Passive House School was the certifier of the Duplex PHI Low Energy house in Sofia.

Architecture
arch. G. Nikolov, “Studio Apxe” Ltd.

Building services
eng. Zahari Bozhilov, “B-Project” Ltd.

Building physics
arch. Veselin Veselinov, “Bauhaus” Ltd.

Certifier
Passivhaus Institut Dr. Wolfgang Feist

Certified building
Low-energy house new build

Treated Floor Area according to PHPP
178 m2 and 218 m2

Construction type
masonry construction

Building type
semi-detached house

Location
Sofia, Bulgaria

Air tightness
n50 = 0.5/h

Annual heating demand
27 kWh /(m2a ) calculated according to PHPP

Heating load
14 W/m2

PE demand (non-renewable Primary Energy)
102 kWh /(m2a ) on heating installation, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP

PER demand (renewable Primary Energy)
104 kWh /(m2a ) on heating installation, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP

Exterior wall
Interior plaster with reinforcement fabric l 0.700 15mm
Hollow brick Wienerberger Porotherm 25 N + F 0.320 250mm
EPS grey 0.033 350mm
Exterior plaster with reinforcement fabric 0.870 15mm

U-value = 0.093 W/(m2K)

Basement floor / floor slab
Screed 1.400 50mm
reinforced concrete floor 2.300 100mm
mound of earth 0.700 100mm
Concrete foundation 2.300 300mm
XPS 0.035 300mm

U-value = 0.11 W/(m2K)

Roof
Interior plaster with reinforcement fabric 0.700 15mm
Reinforced concrete 2.300 140mm
Glaswool 0.034 460mm

U-value = 0.083 W/(m2K)

Frame
Rehau AG, Geneo PHZ

w-value = 0.82 W/(m2K)

Glazing
SGG PLANILUX + PLANITHERM XN Ug 0.60 [W/(m²K)]
g-value 0.54

g-value = 0.6 W/(m2K)
g -value = 54 %

Entrance door
Rehau AG, Geneo PHZ
d-value = 0.79 W/(m2K)

Ventilation
Zehnder, ComfoAir Q 350 ERV

More detailed information about the project you can find here and here.