Swedish cooperative organization HSB aimed to use an intelligent monitoring and control solution to improve the energy efficiency and indoor comfort of a 12-apartment block that is connected to district heating.
At the beginning of 2021, Leanheat® Building—a cloud-based AI solution—was integrated into the building’s existing substation controller, without the need for any extra hardware.
Leanheat® Building software monitors and controls the site remotely. It gathers accurate data that allows HSB to enhance property management, automate the heating system, and analyze performance. Leanheat® Building software optimized the heating system and reduced energy consumption by 10.9% between November 2021 and April 2022. The total amount of energy saved was 11,136 kWh.
At the end of the 2021 heating season, Leanheat® Building data analysis showed that the building had a combination of temperature imbalance and a higher setpoint, which indicated greater energy savings could be made.
In its current state, the two-pipe heating system had static balancing valves on the branches and old Thermostatic Radiator Valves (TRVs) on all radiators. Danfoss ASV-PV return-pipe mounted differential pressure control valves and ASV-BD partner valves were installed to control the differential pressure over the branches. Danfoss RA-N valves were installed on each radiator and were pre-set using the ‘Optimal 2 tool’ to ensure optimum distribution of the water in the heating system. RA-2000 thermostats were also installed on each radiator to enable residents to maintain desired room temperatures and lower energy consumption. Together these components created a dynamic, well-balanced system that eliminated noise and reduced the energy consumption by another 10.2%.
HSB now has a fully optimized, energy efficient heating system that can be monitored remotely, saves money, and keeps apartments at a comfortable temperature.
The total savings established by the combination of Leanheat® Building and Dynamic Hydronic Balancing & Control reach around 20%.
ASV automatic balancing valves provide a dynamic balancing solution for two-pipe heating or cooling applications. The riser-mounted valves eliminate pressure fluctuations occurring in variable flow systems at partial load conditions. For a proper hydronic balance the valves should be combined with pre-setting valves.
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