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BPHEs in district heating systems

The city of Hoyerswerda, in eastern Germany, decided to modernize the city's district heating system.

Today, the new decentralized system supplies heat for tap water and radiators to 20,000 households in Hoyerswerda. One of the world’s most modern combi-power plants for brown coal supplies heat to eight decentralized header stations in Hoyerswerda. The primary task of this kind of power plant is to produce electricity, but steam and water from them are often utilized for district heating.

Every insulation box in the reference header station contains a SWEP BPHE (see application data below).

Each of the eight header stations, spread out across Hoyerswerda, needed a solution for heat transfer between the primary hot water (from the power plant) and the secondary water circuits (connected to the households).

Connecting the primary and secondary circuits with SWEP Brazed Plate Heat Exchangers (BPHEs) solved the problem. To handle the high flows of pressurized water, a number of large BPHEs are installed in each header station. All the BPHEs are mounted in a hard foam insulation box, which eliminates unwanted heat losses during heat transfer.

The energy-efficient BPHEs clearly have a key role in this modern district heating system, which will provide warm sanitary water and heat for the citizens of Hoyerswerda for many years to come.

Hot water from the combi-power plant is transported to the eight building level substations. The secondary water from the header stations is then supplied to the households. Every block of flats contains a building level substation, where another heat transfer process takes place. These building level substations contain two secondary circuits, one for radiator water and one for sanitary water. SWEP BPHEs are of course suitable for the building level substations as well as the header stations.