Tangible initiatives showcase the successful implementation of this shift from conventional fuels to innovative renewable heating systems beyond the district heating grid. We take pride in driving this transformation through our expertise in building physics and sustainability consulting services.
The student residence project located on Döblinger Hauptstraße, with the last renovation dating back to the 1960s, serves as a prime example in this endeavor. Extensive thermal refurbishment is underway, encompassing the entire building envelope, including windows, roof, and firewalls. Internal insulation is being applied to the walls due to a lack of neighbouring building consent.
Moreover, the current gas central heating system, featuring radiators in 84 rooms, will be supplanted by a modern underfloor heating system with individual room temperature control. Notably, this system offers both heating and cooling capabilities at low flow temperatures. Powering these enhancements is a 28 kWp photovoltaic array primarily responsible for generating the system’s operational electricity. Furthermore, comfort ventilation with heat recovery, non-tilt windows, and water- and energy-efficient Coolstart fixtures contribute to resource conservation efforts.
Overview of the New Energy System:
- Installation of two air source heat pumps (approximately 100 kW) operating within the inner courtyard, enclosed within an acoustic enclosure for building heating and hot water supply.
- Hot water provision facilitated by a 1,000-liter storage charging system complemented by a booster heat pump.
- Implementation of underfloor heating spanning a total area of 1,975 square meters for efficient heat distribution and passive cooling.
- Integration of a 28 kWp rooftop-mounted photovoltaic system to power the heat pumps, inject surplus energy into the grid, and cater to the energy needs of comfort ventilation and residential spaces (annual electricity yield: 28,840 kWh, covering 17% of total electricity demand).
- Subsidy support from the City of Vienna to facilitate the transition.
Building Details:
- Property owned by home4students (Austrian Student Support Foundation).
- Usable living space: 2,200 square meters.
- Heating requirement: Reduced to 44.1 kWh/m²a (previously 91.3 kWh/m²a).
- Energy efficiency class: Upgraded to B (previously D).
- Scheduled completion: Summer 2024.
