Research activities of the working group
Projects
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AWT - Investigation of two energy converters with low electrical energy requirements, in order to supply heat to consumers with high temperature demands, using low-temperature district heating network sources
District heating networks 4.0 have a maximum supply temperature up to 95 °C, which is relatively low. These networks are a fundamental part of the energy transformation process. The aim of this research project is to provide, in an efficient manner, a higher temperature flow, up to 120 °C, to certain consumers with such a requirement using District Heating Networks 4.0, despite its lower supply temperature capability. Two energy converters with low electrical power requirements, an absorption heat transformer and an absorption–compression heat pump, are being investigated for their suitability to increase the temperature in the district heating network in a decentralized, demand-oriented manner. -
AbsorpTherm - Efficient and climate-neutral heating concept by a novel drive of an absorption heat pump using a commercially available gas heater
The objective of the research project is to test and demonstrate a prototype in a commercially available heating system, exemplified by a gas heater. The gas heater does not heat the building as usual but drives the absorption heat pump by a hydraulic coupling.
Team
Publications
- J. Brunder, N. Mirl, and K. Stergiaropoulo, “A simulation of a novel combination of a compression heat pump and a thermoelectric heat pump to increase the efficiency,” Gustav Lorentzen Conference on Natural Refrigerants, Marland, USA, 2024, doi: DOI: 10.18462/iir.gl2024.1248.
- J. Brunder, L. Haak, S. Woog, F. Meyer, and K. Stergiaropoulos, “Absorptionswärmepumpe für Ein- Zweifamilienhäuser - Absorptionswärmepumpe angetrieben durch eine hydraulische Kopplung mit einem kommerziellen Wärmeerzeuger,” Jahrestagung des Deutschen Klima- und Kältetechniken Vereins (DKV), Hannover, 2023.
- J. Brunder and K. Stergiaropoulos, “Investigation of a diffusion absorption chiller using a plate heat exchanger as generator.,” 2023, International Institute of Refrigeration (IIR). doi: 10.18462/IIR.ICR.2023.0595.
- J. Brunder and K. Stergiaropoulos, “Analysis and optimisation of the absorber of a diffusion absorption chiller,” 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants, Trondheim, Norway, 2022.
- J. Brunder and K. Stergiaropoulos, “Diffusions-Absorptionskältemaschine mit Plattenaustreiber,” 2022, Universität Stuttgart. doi: 10.18419/OPUS-12616.
- H. Käppeler, J. Brunder, and K. Stegiaropoulos, “Diffusions-Absorptionskältemaschine mit Plattenaustreiber,” Konferenzbeitrag, DKV-Tagung 2022 (Deutschter Kälte- und Klimatechnischer Verband), Magdeburg, 2022.
- J. Brunder, K. Spindler, and K. Stergiaropoulos, “Leistungssteigerung einer Diffusions-Absorptionskältemaschine durch Steigerung des Hilfsgasvolumenstroms,” 2021, Universität Stuttgart. doi: 10.18419/OPUS-12580.
- F. Fuhs, J. Brunder, and K. Stergiaropoulos, “Untersuchung der Strömungseigenschaften im Absorber einer Diffusions-Absorptionskältemaschine,” DKV-Tagung 2021 (Deutschter Kälte- und Klimatechnischer Verband), Dresden, 2021.
- L. Haak, N. Mirl, J. Brunder, K. Spindler, and K. Stergiaropoulos, “Effizienzsteigerung einer NH3/H2O-Absorptionskältemaschine - Experimentelle Untersuchung eines Anlagenkonzepts mit Plattendesorber,” Deutsche Kälte- und Klimatagung, Dresden, p. AA II.1.11-1-AA II.1.11-13, 2021.
- J. Brunder, K. Spindler, and K. Stergiaropoulos, “Untersuchung der Austreibereinheit einer Diffusions-Absorptionskältemaschine mit Plattenaustreiber,” 2020, Universität Stuttgart. doi: 10.18419/OPUS-11271.
- N. Mirl, M. Doil, K. Spindler, and K. Stergiaropoulos, “Comparison of ammonia/water equations of state under operating conditions of absorption systems,” Fluid Phase Equilibria, 2020, doi: 10.1016/j.fluid.2020.112748.
- N. Mirl, F. Schmid, B. Bierling, and K. Spindler, “Design and analysis of an ammonia-water absorption heat pump,” Applied Thermal Engineering, vol. 165, 2020, doi: 10.1016/j.applthermaleng.2019.114531.
- N. Mirl, K. Spindler, and K. Stergiaropoulos, “Visualisierung und Optimierung der Flüssigkeitsverteilung in einem Plattenabsorber,” Jahrestagung des Deutschen Kälte- und Klimatechnischen Vereins, p. AA.II.1.20, 2020, doi: http://dx.doi.org/10.18419/opus-11269.
- F. Yang, T. Grage, N. Mirl, and K. Spindler, “Auswirkungen einer abgesenkten Rücklauftemperatur auf Fernwärmenetze,” EuroHeat&Power, vol. 10/2020, pp. 35–40, 2020.
- F. Yang, N. Mirl, and F. Schmid, “Potenziale von Absorptionswärmepumpen in zentralisierten Wärmeversorgungsnetzen,” Abschlussbericht, 2020.
- N. Mirl, F. Schmid, and K. Spindler, “Experimentelle Untersuchungen zur Senkung der Rücklauftemperatur im Fernwärmenetz,” EuroHeat&Power, vol. 48, no. 5, Art. no. 5, May 2019.
- N. Mirl and K. Spindler, “Optimization potentials for the absorber and the generator of an ammonia-water absorption heat pump,” 25th IIR International Congress of Refrigeration, Montreal, Canada, 2019, doi: http://dx.doi.org/10.18419/opus-10574.
- U. Oechsle and K. Spindler, “Investigation of the nucleation temperature of different heat exchanger surfaces in an ice store,” 25th IIR International Congress of Refrigeration, Montreal, Canada, August 24-30, 2019, no. manuscript ID 164, Art. no. manuscript ID 164, 2019.
- K. Spindler, “Scaling parameters between ammonia and water,” 25th IIR International Congress of Refrigeration, Montreal, Canada, August 24-30, 2019, no. manuscript ID 191, Art. no. manuscript ID 191, 2019.
- A. Frank, W. Heidemann, and K. Spindler, “Electronic component cooling inside switch cabinets: combined radiation and natural convection heat transfer,” Heat and Mass Transfer, Aug. 2018, doi: 10.1007/s00231-018-2427-y.
- W. Heidemann, “Wärmeübergang durch geschweißte Wände mit aufgeschweißten Rohrschlangen,” VDI-Wärmeatlas, pp. 1–10, 2018.
- N. Mirl, F. Schmid, and K. Spindler, “Reduction of the return temperature in district heating systems with an ammonia-water absorption heat pump,” Case Studies in Thermal Engineering, vol. 12, pp. 817–822, Sep. 2018, doi: https://doi.org/10.1016/j.csite.2018.10.010.
- N. Mirl, F. Schmid, and K. Spindler, “Experimentelle Untersuchung zur Einbindung einer Ammoniak-Wasser Absorptionswärmepumpe in Fernwärmenetze,” Jahrestagung des Deutschen Kälte- und Klimatechnischen Vereins, 2018.
- F. Schmid, B. Bierling, and K. Spindler, “Development of a solar-driven diffusion absorption chiller,” Solar Energy, pp. 483–493, 2018.
- F. Schmid, B. Bierling, and K. Spindler, “Development of a solar-driven diffusion absorption chiller,” Solar Energy, vol. 177, pp. 483–493, 2018, doi: https://doi.org/10.1016/j.solener.2018.11.040.
- K. Spindler, “OPTIMUM HIGH PRESSURE FOR TRANSCRITICAL CO2 HEAT PUMPS CONSIDERING ISENTROPIC EFFICIENCY AND GLIDING HEAT EXTRACTION,” 13th IIR Gustav Lorentzen Conference, Valencia, 2018, 2018.
- K. Spindler, “OPTIMUM HIGH PRESSURE FOR TRANSCRITICAL CO2 HEAT PUMPS CONSIDERING ISENTROPIC EFFICIENCY AND GLIDING HEAT EXTRACTION,” 13th IIR Gustav Lorentzen Conference, Valencia, 2018, 2018, doi: dx.doi.org/10.18462/iir.gl.2018.1107.
Weitere Informationen
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Stoffeigenschaften von Ammoniak-Wasser Mischungen
Die wesentlichen Diagramme für das Arbeiten mit Ammoniak-Wasser Mischungen werden hier bereitgestellt. -
Stoffeigenschaften von Ammoniak
Die wesentlichen Stoffeigenschaften von Ammoniak werden hier aufgeführt.
Contact
Apl. Prof. Dr.-Ing. Klaus Spindler
Team Lead