Svenska Fönster AB

Svenska Fönster is one of Sweden’s leading manufacturers of windows and doors, known for its focus on quality, innovation, and sustainability. The company provides energy-efficient solutions for both private and commercial sectors and is actively working to minimize its environmental impact in production.

In 2024, Svenska Fönster took an important step toward a greener future with its investment in a 2 x 4 MW hot water system from Linka Energy A/S, utilizing wood shavings for combustion. The existing boilers are being replaced with new ones, even in limited space conditions, and Linka’s solution can handle both wood shavings and wood chips separately, as well as combine both fuels in a single program.

The system utilizes production by-products as a sustainable energy source, which not only reduces CO2 emissions but also lowers costs related to waste management and energy consumption.

This investment supports the company’s overall goal of improving energy efficiency and minimizing environmental impact, while also strengthening its position as a responsible and sustainable player in the industry.

The boiler system, consisting of two 4 MW Linka H cylindrical hot water boilers, is installed in two boiler rooms and is equipped with Linka’s patented combustion technology, ensuring maximum fuel utilization.

The fuel is transported via augers from the existing intermediate storage tank. As part of the delivery, Linka has taken over the control of the customer’s fuel extraction system, which retrieves fuel from both the wood chip silo and the wood pellet storage with a walking floor.

The process is automatically initiated with a signal from the control system once the boiler’s ignition procedure has been started.

In the boiler’s combustion chamber, a moving step grate is installed to minimize slag formation, and the co-current combustion system is Linka’s own globally patented solution.

The flue gas from the boiler passes through a Linka© multicyclone, type 6 x 4, and then continues to an electrostatic precipitator (ESP), which cleans the flue gas, significantly reducing dust emissions before it is discharged through an existing chimney.

The ash is then transported to the existing ash container.

The system is controlled via a PLC control system, which monitors the system and sends alarms via the internet and SMS. It is also possible to monitor the system via smartphones, tablets, and/or PCs.

A fibre optic cable has been laid alongside the district heating pipes between the central plants, where Linka has connected the alarm system to the customer’s existing system.

The system includes 2 transmission pumps for the connection between the two plants, used to transport heat in one direction, as well as 2 valves to control heat transfer in the opposite direction.

Additionally, 2 distribution pumps with a system shunt are installed at each plant, where the shunt is regulated based on the outdoor temperature.

The system has been upgraded from an open to a closed loop. Linka has provided a pressure holding system and a vacuum degasser for degassing the water.