District Heating Substations of the Future

摘要

The performance specifications for heat exchangers in district heating (DH) substations have traditionally been made at summer conditions for the domestic hot water (DHW) part and at winter conditions for the heating (HE) part. Over time the specifications have been rather constant, but with a clear tendency towards increased thermal length for the heat exchanger. The question is if the specification level develops sufficiently to fulfil the future demands. In the future, the DH supply temperature will be reduced to achieve higher system efficiency, therefore a longer thermal length and increased heat transfer area of the heat exchanger is needed.