Theoretical comparison of solar water/space-heating combi systems and stratification design options

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A theoretical analysis of differently designed solar combi systems is performed with weather data from the Danish Design Reference Year (55ºN). Three solar combi system designs found on the market are investigated. The investigation focuses on the influence of stratification on the thermal performance under different operation conditions with different domestic hot water and space heating demands. The solar combi systems are initially equipped with heat exchanger spirals and direct inlets to the tank. A step-by-step investigation is performed demonstrating the influence on the thermal performance of using inlet stratification pipes at the different inlets. Also, it is investigated how the design of the space heating system, the control system of the solar collectors, and the system size influence the thermal performance of solar combi systems. The work is carried out within the Solar Heating and Cooling Programme of the International Energy Agency (IEA SHC), Task 32.
Original languageEnglish
JournalJournal of Solar Energy Engineering
Pages (from-to)438-448
Publication statusPublished - 2007


  • Inlet stratifier
  • Space heating system
  • Solar combi system design
  • Net utilized solar energy
  • Solar combi system size
  • Solar fraction


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