©Curt Themessl

Villa P

Location: Hietzing, Vienna, Austria

Architect: Najjar & Najjar

Material: Stone, Aluminum & glass

Studio: Najjar Najjar Architects

Architects: Rames Najjar, Karim Najjar

Design Team: Rames Najjar, Cecilia Bechteler-Najar, Karim Najjar, Mihai Remus Spanache, Szczepan Sommer, Atanas Zhelev

Building Physics: Kaltenegger und Partner Architekten ZT GmbH

Building Services: Ökoplan Energiedienstleistungen GmbH

Structural Engineer: Werkraum Ingenieure ZT Wien

Lighting Consultant: LITEstudio Wien

Construction Supervision: Rames Najjar, Wilfred Pleyer

Photographer : Curt Themessl

Story:

Text provided by the architect:

House P is situated in the green outskirts of Vienna, which gently nestles into the foothills of the Wienerwald.

Hence, our design concept aims to seamlessly integrate the building into the lush landscape, with particular emphasis on engaging residents with the natural beauty of the surroundings and the idyllic vistas. The spatial arrangement within the living areas has been carefully crafted to create a sequence of expansive interconnected zones. The overall experience is further enriched by unobstructed sightlines, allowing inhabitants to perceive the living spaces as a vast panorama.
The ongoing spatial zoning within the interior is mirrored in the design of the outdoor areas. This concept seamlessly integrates the generous terrace and the pool, oriented perpendicular to the building axis, with the indoor spaces. This design coherence creates a fluid transition between the interior and exterior. The terrace and pool become integral components of the living space, affording residents the opportunity to fully embrace the outdoor beauty and tranquility, while maintaining a harmonious connection to the interior of the house.
A generously curved, shell-like, and cantilevered roof covers the upper-level living space as well as the garden level, providing unobstructed views of the city. The roof has been intentionally designed to maximize passive solar gains and is equipped with solar panels.
The building is supplied by a geothermal system featuring a heat pump installation and benefits from passive cooling as well as earth ducts for sustainable climate control.

"BUILDING SERVICES The building was designed with a focus on energy efficiency and sustainability to reduce energy consumption and maximize comfort. Various technologies and principles were employed in the design to achieve these goals.
Heating and Cooling The energy source for heating and cooling in this building is geothermal drilling. This allows the utilization of geothermal energy, converted into energy through a brine/water heat pump. The thermal storage tank plays a vital role in efficiently distributing energy for heating and cooling purposes. Energy is distributed through various pump groups. A heat exchanger is responsible for the pool heating, while a ventilation system equipped with heating coils, reheat coils, and cooling coils ensures ventilation and temperature control in the rooms. Additionally, there are floor heating and cooling systems along with underfloor convector units for cooling. A notable feature is the capability of free cooling during transitional seasons, even without utilizing the heat pump. This is facilitated by floor cooling, underfloor convector units, and the cooling coil of the ventilation system.
Furthermore, a contemporary version of the Badgir system contributes to passive climate control. This system utilizes natural air circulation to regulate room temperature pleasantly without relying on energy-intensive air conditioning.
Ventilation The building's ventilation occurs mechanically through a central ventilation system equipped with integrated heat recovery. This not only brings fresh air into the rooms but also recovers heat from the exhaust air, contributing to the system's energy efficiency.
Sanitary In the realm of sanitary technology, central hot water preparation takes place through a fresh water station supplied with energy from the heat pump. Additionally, well water and rainwater are utilized to conserve resources. External water connections such as garden hydrants and an outdoor shower are also available to facilitate water usage outdoors.
CONTROL The control of various building service components is executed through individual room control using the EIB-BUS system. This allows precise management of heating, cooling, and ventilation in each room of the building.

CONTRACTORS

Metal-Work: Krobath Metallbau

Electrician: Elektro Ferstl GmbH

Audio Configuration: Inveoo GmbH

Carpenter: wohn hand werk Stemmer GmbH

Carpenter: Querschnitt GmbH Objektgestaltung mit Holz

Stonemason: stone4you e.U.

Elevator: Kogler Aufzugs Elektrikerbau GmbH

Pool: Polytherm

Sauna: STARPOOL wellness concept

Kitchen: Faulmann & Faulmann

Fireplace: Mandl & Bauer