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Software for the thermohydraulic design of solar systems

The figure shows the pressure curve and the steam volume in the pipes outside the solar collectors.

At a glance

  • Co-project leader : Dr. Andreas Witzig
  • Project team : Hanna Sotnikova
  • Project status : completed
  • Funding partner : Federal government (Bundesamt für Energie BFE / Forschungsprogramm Solarwärme)
  • Contact person : Andreas Witzig


Solar thermal energy offers efficient solutions for many thermal applications. However, as a prerequisite for the realization of its potential, the costs have to be reduced significantly. In a project funded by the Swiss Federal Office of Energy SFOE a thermal-hydraulic software tool has been developed. The tool offers the following features:

  • Dimensioning of pipe network and pump
  • Proof of de-aeration capability
  • Dimensioning of membrane expansion vessels
  • Proof of stagnation safety

The application of the software allows to cost-optimize solar circuits and at the same time prevents malfunctions and defects caused by design errors. An interface to the simulation tool Polysun provides a seamless integration into the established planning process.

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