Better indoor climate at Bergsøy school

– We have a completely different indoor climate now Decentralised ventilation has shown great results at Bergsøy School’s Borga department in Fosnavåg, Norway. So says Philipp Kessler-Myking, project manager employed at the property department of Herøy Municipality.

The municipality is “a gem by the sea at Sunnmøre” with islands large and small, including the famous bird island, Runde. The primary school at Bergsøya consists of two buildings, one of which dates from 1957, with solutions typical of that time: Fresh air provided by the windows, and mechanical exhaust. Not surprisingly, this meant that the indoor climate was poor.

- We conducted a very thorough mapping in collaboration with the occupational health service. It turned out that we had highly unacceptable CO2 levels of up to 1,700 ppm, explains  Kessler-Myking.

A practical and affordable solution 

So, something had to be done about the ventilation system. The municipality opted to invest in a decentralised, room-by-room solution with ventilation units from Airmaster.

- It was the most affordable ventilation solution and it was practically doable. You meet the need of existing rooms, and you don’t need space for a technical room, Kessler-Myking points out. Fireproofing is simpler and the installation itself is much faster than a traditional solution with a centralised ventilation system.

Demand-controlled according to CO2

A total of nine classrooms in the building which houses the 5th, 6th and 7th grades have had decentralised ventilation units installed. Each unit is demand-controlled according to the CO2 level. The ventilation units have been in operation since before summer 2018, and changes in the indoor climate were soon noticeable.

We have a completely different indoor climate now; you can really feel it. The ventilation units record the CO2 level ‘24/7’ and operate continuously, up and down as needed. It’s great, smiles Kessler-Myking.

“The ventilation units record the CO2 level “24/7” and operate continuously, up and down as needed,” explains Philipp Kessler-Myking.

Better acoustics with system ceiling

Due to difficult acoustics and hanging light fixtures, which could pose a problem for the ventilation, the classrooms were fitted with system ceilings as the ventilation needed to be upgraded.

– The new ceiling with integrated lighting has a smooth surface, providing ideal working conditions for the ventilation. It also makes for a far better indoor climate sound-wise, and it senses the users, says Kessler-Myking.

The light fixtures were replaced with demand-controlled LED lighting, which has provided much better lighting.   

Smooth surfaces an advantage

The air emitted by the ventilation unit along the ceiling should not encounter too many obstacles along the way if negative pressure (the Coanda effect) is to be maintained. So, it really helped that the old light fixtures at Bergsøy School were replaced. New LED lighting and a system ceiling were installed along with the ventilation units. 

– The people at the municipality have been very practical and brilliant at finding good solutions, stresses the consultant from Airmaster Norway. They have chosen a combination of Airmaster AM 1000 ventilation units. Airmaster also supplied a cloud-based online control solution (Airlinq Online).

Heat recovery

The ventilation units have built-in countercurrent heat exchangers. At the time of writing, in autumn 2018, it was still too early to conclude anything about how energy efficient they are in practice. And, as Kessler-Myking points out, the goal was above all to achieve a better indoor climate. It would be wrong to talk of low energy consumption when there was no ventilation before. And saving energy at the expense of the indoor climate, and not least the learning environment, would be wrong.

FACTS: Decentralised ventilation units from Airmaster

The ventilation units are available in a variety of sizes and variants such as ceiling-mounted, wall-mounted and floor-standing with various options with regard to air intake and exhaust.

The ventilation units are primarily placed by external walls. Without ducts, we have no additional pressure drop, and then the SFP factor for all Airmaster ventilation units is below 1.0. The units have countercurrent heat exchangers which can provide 85% heat recovery. Solutions for handling any condensation and ice formation are built in.

Ready for a breath of fresh air

At Airmaster, we are “decentral” through and through. We are unrivalled when it comes to creating the best indoor climate and optimal well-being because we take each room and its occupants into account – and because we constantly strive to improve on what we do.

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