Using renewable energy in heating networks more efficiently
The BINE-Projektinfo brochure “Efficiently using district heating” (14/2015)
Lowering return temperatures and optimising customer systems
More efficient domestic hot water heating is a central starting point. In heating networks, domestic hot water (DHW) heating is in itself insufficient to adequately reduce the return temperature during the summer months.
Measurements in eight apartment buildings and a terraced house complex showed that the bulk of the heat consumed is used for reheating the circulating drinking water.
The primary heating of the cold water plays a minor role. In order to obtain lower return temperatures when heating the domestic hot water, storage tanks have to be integrated into the system to temporarily store the residual heat from the circulation pipes.
This enables a gradual heating process. Seven district heating transfer stations have been developed with different DHW systems for different building types and for both summer and winter requirements, and evaluated on a test rig. Three systems enabled return temperatures lower than 35 °C to be achieved.
This LowEx Systems research project is a collaboration between the Stadtwerke München municipal utility company, Munich University of Applied Sciences and the Ebert-Ingenieure building services engineering company.
The investigations were carried with a view to Munich’s plans to use only renewable energy for district heating provision by the year 2040.
You found all informations about the BINE Projektinfo brochure “Efficiently using district heating” (14/2015) here:
http://www.bine.info/en/press/press-releases/press/pressemitteilung/erneuerbare-…
Uwe Milles/Birgit Schneider
presse(at)bine.info
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