The solution was Grundfos iGRID. It lowers the supply temperature locally in specific zones of the grid. To do so a local mixing loop pumps water from the return pipe into the local supply pipe.
By monitoring the critical parts of the network with pit measure points, the mixing loop can adjust temperature and pressure to meet the exact consumer need in real-time. This reduces heat losses and improves comfort.
Installing a mixing loop in a pit
27% heat loss reduction The first zoning solution was developed in cooperation between Grundfos and GGF for a zone supplying 300 large villas consuming 9,000 MWh/year.
From 2018 to 2019 supply temperature in the zone was lowered from 90 to 67°C during winter and from 72 to 62°C during summer.
By working with selected house owners optimizing their return temperatures, GGF expects to lower supply and return temperatures in the zone even further, leading to a 27% heat loss reduction in 2020 compared to 2018.
T-ZONE in Gentofte, Copenhagen
Consumed energy [MWh/year] *
Supply/Return temperatures, summer [°C]
Supply/Return temperatures, winter [°C]
Heat loss reduction [MWh/year]
Heat loss reduction [%]
* The zone is continuously adding new houses, as it is an area converting from natural gas to district heating.
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