Croatia · Hrvatska
Croatia · Hrvatska
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A clever and cost-effective renovation transforming a 1950s residential block
In Sweden’s popular summer destination, 135 apartments built in the 1950s gained increased comfort with a modern ventilation solution. Systemair, in close collaboration with the contractor, solved the challenges creatively.
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 owing to skilled project management and strong cooperation between the construction company and supplier.
Design knowledge and experience
Solutions addressed IAQ requirements and were compliant with municipality’s stringent fire safety and energy efficiency regulations.
Investing with long term view
Municipality investment unlocks energy efficiency and ensures returns from annual energy consumption savings, while improving comfort and IAQ of occupants.
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.
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How to get returns on energy efficiency investments
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 residential standard of the area, providing residents with better comfort and indoor air quality.
With 135 apartments, Nynäshamnsbostäder also estimated that an investment 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 units and pipes when making an installation in existing homes while ensuring that it 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
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Thinking outside the box
Johnny Lindström worked closely with the Systemair team through Frederik 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 provided easy installation, service, and maintenance access.
The next step was to finalise the ventilation solution to be installed, and ensuring they were installed quickly not to disrupt occupants and, most notably, that it will pass the final fire-safety and civil inspections.
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Digitalisation for seamless operation and maintenance
As J. Lindström Ventservice will be responsible for the service and maintenance of the facilities for five years before handing it over to Nynäsbostäder, Johnny needed to ensure better control solutions are in place to streamline operation and maintenance procedures.
The chosen solution features a cloud service where operation can be monitored and analysed. Being connected to the app, Johnny can be alerted of any errors on his mobile to ensure he can prepare the right equipment to address any issues or provide the necessary instructions to a colleague.
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Delivering ahead of schedule
Overall, Systemair supplied:
28 SAVE VTC700 units with SAVE Touch and SAVE Connect
105 TFSK 200 EC Sileo fans
The SAVE VTC700 was placed at the bottom of each staircase and provides 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%. No carbon filters were used, which is not typical in such older buildings where there are no spaces for actual ducts.
Since all units are connected, we can effectively monitor energy consumption and performance. For example, when temperatures are at -22 °C, we were a little worried about the capacity of the heating batteries. However, through the dashboard we can see only 39% was used confirming that everything was running smoothly and efficiently.
Owner and Managing Director, J. Lindström Ventservice AB
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Fire-gas fans are in operation, and when a fire is detected, the fans automatically turn on and run continuously for 60 minutes. All units have fire-protected cables, and teams worked together to ensure the correct flow temperature on the fans. "We have had to solve this with fuses so that when the apartment temperature reaches 72°C in case of a fire, it strikes again, and the unit's fans will continue to run and last 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 made possible because of skilled project management, good planning and strong cooperation among suppliers and the contractor.
The solutions also met stringent fire safety regulations and inspections with very few alterations and corrections required, meaning the products were delivered and installed as specified and functioned optimally.
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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.
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