Drain Back, Low Flow Solar Combi Systems: Design, Monitoring and Simulation

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Drain Back systems with ETC collectors are tested and analyzed in a Danish - Chinese cooperation project. Experiences from early work at DTU, with drain back, low flow systems, was used to design two systems:
1) One laboratory system at DTU and 2) One demonstration system in a single family house in Sorö Denmark. Detailed monitoring and modelling of the system in the DTU lab is done to be able to generalize the results, to other climates and loads and to make design optimizations.
The advantage with drain back, low flow systems, is that the system can be made more simple with less components and that the performance can be enhanced. A combination of the drain back- and system expansion vessel was tested successfully. Small initial problems with installation and proposals for design improvements to avoid these in practice are described in the paper. Installer education and training is an important step to have success with drain back systems.
Original languageEnglish
Title of host publicationProceedings of EuroSun 2014
Number of pages10
PublisherInternational Solar Energy Society
Publication date2014
Publication statusPublished - 2014
EventEuroSun 2014: International conference on solar energy and buildings - Aix-les-Bains Congress Center, Aix-les-Bains, France
Duration: 16 Sep 201419 Sep 2014


ConferenceEuroSun 2014
LocationAix-les-Bains Congress Center
Internet address


  • Drain back
  • Low flow
  • Solar combi system
  • ETC collectors

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