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Modelling of Floor Heating and Cooling in Residential Districts

Author

Listed:
  • Xenia Kirschstein

    (Institute of Structural Mechanics and Design, Department of Civil and Environmental Engineering, Technical University of Darmstadt, 64289 Darmstadt, Germany)

  • Joscha Reber

    (Institute of Structural Mechanics and Design, Department of Civil and Environmental Engineering, Technical University of Darmstadt, 64289 Darmstadt, Germany)

  • Rouven Zeus

    (Institute of Geotechnics, Department of Civil and Environmental Engineering, Technical University of Darmstadt, 64289 Darmstadt, Germany)

  • Miriam Schuster

    (Institute of Structural Mechanics and Design, Department of Civil and Environmental Engineering, Technical University of Darmstadt, 64289 Darmstadt, Germany)

  • Nadja Bishara

    (Institute of Structural Mechanics and Design, Department of Civil and Environmental Engineering, Technical University of Darmstadt, 64289 Darmstadt, Germany)

Abstract

In this study, a method is proposed to expand the utilization of an existing calculation model for a floor heat exchanger (HX) from room scale to small district scale. The model, namely Trnsys Type 653, is typically employed for the simulation of single or simultaneously controlled parallel heating circuits. It uses a simplified approach to calculate the heat exchange between fluid and screed, taking the HX effectiveness as an input. In order to calculate the effectiveness based on the HX design, fluid properties and mass flow rate, a Python model is developed to be coupled with Type 653. The results are compared to a reference finite element model set up in COMSOL ® and depend on the HX design. The highest deviations range from over 1 K for 35 min to over 2 K for 175 min, while the lowest deviations range from below 0.5 K to below 1 K. Furthermore, the simplification of the floor HX model is analyzed by summarizing heating circuits from single rooms to a whole flat and from single flats to a whole floor. This approach results in deviations of approximately 2 and 4%, respectively, in the overall transferred heat over longer periods of time, while the switch-on frequency of the controller in an exemplary day is halved. While further analysis is required, the described simplifications seem promising for detailed district simulations with relatively low computational effort.

Suggested Citation

  • Xenia Kirschstein & Joscha Reber & Rouven Zeus & Miriam Schuster & Nadja Bishara, 2023. "Modelling of Floor Heating and Cooling in Residential Districts," Energies, MDPI, vol. 16(15), pages 1-17, August.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:15:p:5850-:d:1212383
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    References listed on IDEAS

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