)
A clever and cost-effective renovation transforms a 1950s residential block
For the residents of 135 apartments, built in Nynäshamn in the 1950s, the installation of modern ventilation systems meant increased comfort. Systemair, in close collaboration with the contractor, supplied creative solutions to the challenges involved.
Nynäshamnsbostäder Residential Area, Sweden
135
apartments in 7 monthsSEK 500,000
estimated annual savings from new installed units1950s
Initial construction period of residential buildingStrong cooperation and project management
135 apartments were successfully retrofitted with modern ventilation systems four months ahead of schedule thanks to skilled project management and strong cooperation between the construction company and supplier.
Design knowledge and experience
The systems fulfill requirements for indoor air quality (IAQ) and comply with the municipality’s stringent fire safety and energy efficiency regulations.
A long term investment
For the municipality, the investment in energy efficiency guarantees annual savings in energy consumption, while improving comfort and IAQ for the occupants of the apartments.
Digital solutions offering more savings, better controls
Digital and connected units allow for seamless operation and easier maintenance procedures.
- Europe
- 2022
- Residential
- Contractor
J. Lindström Ventservice AB
- Client
Nynäsbostäder, Nynäshamn's municipal housing company.
)
How to get returns on investments in energy efficiency
Nynäshamn is a popular summer destination in Stockholm County. It’s also home to a residential area managed by the municipal housing company, Nynäshamnsbostäder. The area was originally built during the 1950s-1960s.
Nynäshamnsbostäder wanted their properties to have modern, more energy-efficient HVAC solutions. The requirement was to install a ventilation system with heat recovery (FTX) to improve the living standard in the area, providing residents with better comfort and indoor air quality.
With 135 apartments, Nynäshamnsbostäder also estimated that investing in energy-efficient ventilation systems would save up to 500,000 SEK annually.
In this project, Fredrik Jakobsson from Systemair collaborated with Johnny Lindström, owner and CEO of J. Lindström Ventservice AB, the main contractor.
It can be tricky to find the right space for AHUs and pipes when installing them in existing homes while ensuring that the project remains cost-effective. But with long experience, you get an eye for flexible and sometimes unexpected solutions.
Owner and Managing Director, J. Lindström Ventservice AB
)
)
Thinking outside the box
Johnny Lindström worked closely with the Systemair team with Fredrik as speaking partner to address the unique challenges of the renovation project.
The unexpected solution came in the form of a garbage room in each stairwell, which they identified as the perfect space to bring in an air handling unit because it allowed easy access for installation, service, and maintenance.
The next step was to finalise the ventilation solution to be installed, and ensure fast installed to avoid disturbing residents. It also needed to meet fire-safety regulations and pass final inspection by the municipality.
)
Digitalisation for trouble-free operation and maintenance
As J. Lindström Ventservice will be responsible for the service and maintenance of the systems for five years before handing it over to Nynäsbostäder, Johnny needed to ensure better control solutions were in place to streamline operation and maintenance procedures.
The solution chosen features a cloud service where operation can be monitored and analysed. Being connected to the app, Johnny can receive notifications on his cell phone if errors arise, enabling him to prepare the right equipment to address any issues or provide the necessary instructions to a colleague.
)
Delivery ahead of schedule
Overall, Systemair supplied:
28 SAVE VTC700 units with SAVE Touch and SAVE Connect
105 TFSK 200 EC Sileo fans
A SAVE VTC700 was placed at the bottom of each staircase and supplies 5-7 apartments with fresh air and reliable ventilation.
The preheating system within each SAVE AHU helps avoid condensation and increases the efficiency of the heat exchanger by up to 82-85%. Kitchen extractor fans are connected to each individual apartment via sealed ducts. No carbon filters were used, which is not typical in older buildings where there are no spaces for actual ducts.
Since all AHUs are connected, we can monitor energy consumption and performance efficiently. For example, last winter when temperatures were at -22 °C, we were a little worried about the capacity of the heating batteries. However, through the dashboard we could see that only 39% was used, confirming that everything was running smoothly and efficiently.
Owner and Managing Director, J. Lindström Ventservice AB
)
Smoke extract fans are in operation and if a fire is detected, they start automatically and run continuously for 60 minutes. “All units have fire-protected cables, and we have put a lot of effort into finding the right flow and temperature. We solved this with fuses so that, in case of a fire, when the apartment temperature reaches 72°C it trips the fuse, and the unit's fans will continue to run for 60 minutes."
All systems were installed and operational in all 135 apartments within seven months - four months ahead of schedule. The quick turnaround was thanks to skilled project management, efficient planning and strong cooperation among suppliers, the construction company and the contractor.
The solutions also met stringent fire safety regulations and passed final inspections with very few alterations and adjustments required, meaning the products were delivered and installed as specified and functioned optimally.
)
We are here to support you!
Feel free to contact our nearest Systemair office, where our team of experts can guide you towards the best solution to meet your project goals.
?_=1734202709075)
?_=1734258706293)