Category: Water treatment
Kalmar Vatten AB
Challenge: Newly renovated Läckeby pressure staging station was opened in 2016, but already after a month of operation, problems with corrosion on the new components were encountered. “On the pipes one could see how moisture from the air condensed and water ran everywhere,” says Johan Westin, Operation Manager at Kalmar Water.
Solution: Since September, the new components, worth a total of 700,000 SEK, are protected by a FLEX dehumidifier purchased by Airwatergreen. Läckeby had also encountered black mold, which is the more dangerous type of mold. By using the dehumidifier to remove the climate outside of the so-called mold index Lim 1, the mold was left latent and you could easily wipe away the stains.
“Now it’s bone dry,” confirms Johan. Since we had spent a lot of time and money refreshing and modernizing the Läckeby Pressure Station, we would of course keep the station in good condition.
Category: District heating
– “We want to offer a safe workplace”
The network, consisting of a total of 105 million lines, dates from 1965 and is thus one of the oldest in Sweden. Several studies have come to the conclusion that the best way to get rid of corrosion problems would be to remove the chambers where the problems and risks are greatest, but due to the high maintenance costs, there is no economy for this. “That’s a catch 22 situation. The money we needed to build the chambers has been used to maintain them,” explains Mats.
Solution: Since March 2016, the district heating chambers are protected by air dehumidifiers from Airwatergreen. They have reduced the amount of moisture in the air, so that corrosion has stopped. – The critical humidity level for corrosion is at 60% relative humidity. Keeping the level below this it will stop corrosion, “explains Airwater Greens Research and Development Manager Fredrik Edström.
Kraftringen and Airwatergreen designed the packaged service “Dry climate”. This means that Kraftringen transfers the responsibility for the climate in the chambers of Airwatergreen at a fixed monthly cost.
“This means we do not need to tie any capital. We receive an invoice every quarter and Airwatergreen takes care of the rest. In addition to reducing air humidity, Airwatergreen provides us with data about the climate in the chambers are, which simplifies planning of 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 that we now managed thanks to “Dry Climate”!
Category: Churches and cultural buildings
Uppåkra has taken a holistic approach about the climate
Uppåkra Church in Lund is today in excellent condition, but as in many other churches, indoor climate has previously caused problems with both mold and high heating costs. “We have spent more than 30 million on renovations in recent years, partly due to moisture problems,” says Lars Törnqvist, property manager in Uppåkra parish. In the summers, we have sometimes been forced to warm the church to 30 degrees to reduce the relative humidity to acceptable levels, at the expense of both economy and comfort.
Challenge: The church has been using a climate control system for a few years, which has a function that warms the church to lower the relative humidity. During the summer, when the air outdoor is both warm and humid, the church has kept the heating turned up beyond the comfort levels – just to “handle” the humidity in the air. “We have been allowed to shut down the heat during worship so that the visitors do not turn around and walk out the door,” concludes the church warden Ola Bengtsson.
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 you can keep a lower temperature when the church is not used still maintaining a suitable level of relative humidity.
– Heating is for the comfort. Between the sessions, both the church and the wallet are better with smart dehumidification, “says Jonny Bjurman, researcher in the area of Gothenburg University.
Category: Water and Wastewater
Oslo Municipality is changing its pipeline
The pipeline network in Norway’s capital is changing. A large part of the facilities are now being reviewed with a focus on energy efficiency, work environment and automation. The main sewage pipeline network consists of about 150 facilities located around the city.
Challenge: To handle the climate and indoor environment inside the pump stations, heating combined with ventilation has been used. This despite the fact that the pump stations are service buildings with inspection staff as the only visitors. Therefore, there are obvious possibilities to lower the temperature in order to save energy. However, in order to lower the temperature without risking elevated relative moisture levels, additional investment in dehumidification is required.
Solution: In the spring of 2017, an evaluation of Airwatergreens dehumidifier FLEX was conducted to see how it coped with the tough environment in these sites. The evaluation concluded that the indoor environment was significantly better with lower humidity, thus protecting devices and components. In addition, the working environment became both better and safer.
In September, the second Airwatergreen FLEX dehumidifier was commissioned. This time it was an uninsulated pump station built in concrete. Here, you have previously been relying on heating with direct power (4650W installed power) and ventilation, but still having a problem with too high levels of humidity. The pump station is 40m2 and contains 3 pumps each pumping 160L of sewage per second.
“The measures we are implementing now streamline and improve our pipeline,” says Lars-Olov Orre, Senior Engineer at the Water and Sewage Authority at Oslo Municipality.