– We want to offer a safe workplace!
The network, which consists of a total of 105 miles, is from 1965 and thus one of the oldest in Sweden. Several studies have come to the conclusion that the best way to get away from problems such as corrosion would be to remove the chambers where the problems and risks are greatest, but because of the high maintenance costs, there is no economy for this. - It is a step 22. The money we needed to build the chambers has been used to maintain them, Mats explains.
Solution: Since March 2016, the district heating chambers are protected by air dehumidifiers built on hot condensation, which has reduced the amount of moisture in the air, so that the corrosion processes have stopped.
- The critical limit for corrosion is at 60% relative humidity. If you keep the spaces under it then the corrosion stops, explains Airwatergreen's research and development manager Fredrik Edström.
Kraftringen and Airwatergreen designed the service "Dry climate". This means that Kraftringen transfers the responsibility for the climate in the chambers of the Airwatergreen for a fixed monthly cost. - This means that we do not have to bind any capital. We receive an invoice every quarter and the Airwatergreen handles the rest. In addition to lowering the humidity, the Airwatergreen provides us with data on how the chambers feel, which simplifies the planning of the maintenance, says Mats.
He also emphasizes that those who work in the chambers have a better working environment.
– It's not just about the maintenance money we save on this. We want to offer a safe workplace for the employees who are down in these chambers daily - something we have now succeeded with thanks to "Dry climate"!
Churches and other culture buildings
Uppåkra has taken a holistic approach to the climate
Uppåkra church in Lund's pin is today in excellent condition, but as in so many other churches, the indoor climate has previously posed problems with both mould and high heating costs. - We have spent up to 30 million on renovations in recent years, partly because of problems with the moisture, says Lars Törnqvist, property manager in Uppåkra parish. In the summers, it has also been forced to heat the church up to nearly 30 degrees to bring down the moisture content, at the expense of both economy and comfort.
Solution: The church has for some years been back on a climate control system installed, which has a function that warms the church to lower the humidity. In late summer, when the air outdoors is both warm and humid, the church has therefore been warmed long over comfort heat - only to "bowl" with the water in the air.
- We have been allowed to shut down the heat before worship in order for the visitors not to turn in the door, the church's caretaker Ola Bengtsson says.
Solution: During the summer of 2016, two dehumidifiers, FLEX Integrate from Airwatergreen, were installed. Since then, the climate has improved significantly, while saving money due to reduced heating needs. The dehumidifiers also communicate with the control system, so that one can keep a lower temperature partly when the church should be warm, but also when there is no activity.
– " Heat is for comfort, Between the ordinances, both the church and the wallet are better off with smart dehumidification, ”says Jonny Bjurman, researcher in the field at Gothenburg University.
Water and Sewage
Oslo Kommune sets up its pipeline network
The pipeline network in the capital of Norway is changing. A large proportion of the facilities are now being reviewed with a focus on energy efficiency, work environment and automation. The capital's wastewater pipeline network consists of about 150 plants located around the city.
Solution: In order to handle the climate and the indoor environment inside the pump stations, heating combined with ventilation has been used. This is despite the fact that the pump stations are service buildings with only rounding staff as the only visitors. Therefore, there are great opportunities to be able to lower the temperature in order to save energy. However, in order to lower the temperature without risking increased moisture levels, additional investments in dehumidification are needed.
Solution: During the spring of 2017, an evaluation of Airwatergreen's dehumidifier FLEX was carried out, to see how it managed the tough environment prevailing in these facilities. The evaluation concluded that the indoor environment was significantly better with lower humidity, which protects equipment and components. In addition, the working environment became both better and safer.
In september,the second Airwatergreen dehumidifier of the model FLEX was ordered. This time it was an uninsulated pumping station built in concrete. Here one has previously been able to rely on heating with direct-acting electricity (4650W installed power) and ventilation but still had problems with moisture. The pump station is 40m2 and contains 3pcs of pumps each pumping 160L of sewage per second.
– The measures we are implementing now improve the efficiency and improve our management network, says Lars-Olov Orre, Senior Engineer at the Water and Wastewater Administration in Oslo Municipality.
A crawl ground in a school
Västerängschool in Håbo kommun
Mould in the crawl ground at Västerängschool
Västerängschool is located in Håbo municipality. There, training is provided from pre-school classes to school year 9 and also leisure activities. There are a total of about 500 students attending school.
Challenge: The background to the installation was that staff and students complained of headaches and itchy eyes for a while. Upon inspection, mould was discovered in the crawl space during the school.
With a three-step solution, the issues were addressed:
- Plastic film was laid out on the ground.
- Dehumudifiers were installed (4 each of model FLEX)
- Ventilation were limited to the crawl ground
The reduced ventilation limits the moisture load but also the energy consumption. Today, the crawl base is kept with a moisture level below 60% RH and without risk of mould growth.