Oehler, Johannes und Yücel, Fatma Cansu und Stathopoulos, Panagiotis (2025) Experimental Performance Analysis of a 50 kW Brayton Turbomachine Heat Pump Demonstrator. In: 70th ASME Turbo Expo 2025: Turbomachinery Technical Conference and Exposition, GT 2025. The American Society of Mechanical Engineers (ASME). ASME Turbo Expo 2025: Turbomachinery Technical Conference and Exposition, 2025-06-16 - 2025-06-20, Memphis, Tennessee, USA. doi: 10.1115/GT2025-152419. ISBN 978-0-7918-8880-3.
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Offizielle URL: https://dx.doi.org/10.1115/GT2025-152419
Kurzfassung
The high-temperature heat pump CoBra is the first demonstrator of a closed-loop Brayton heat pump realizing sink temperatures above 150 °C. The experimental results can proof the feasibility of a turbomachine-driven Brayton heat pump delivering heat and cold simultaneously. The German Aerospace Center (DLR) developed the Cottbus Brayton cycle heat pump CoBra, a closed-loop Brayton heat pump utilizing dry air as the working medium. The CoBra is fully operational and has been used for experiments since spring 2024. This work evaluates the steady-state performance of the CoBra heat pump demonstrator experimentally for the first time. In the current setup, the heat pump achieves a heating capacity of up to 55 kW and can supply process heat up to 170°C with a coefficient of performance (COP) of 1.39 using air at TIII = 15 °C as sole heat source. The heat pump’s operational envelope and performance in terms of supplied thermal power, supply temperature and efficiency is analyzed for different operating conditions. Increasing compressor speed raises both heating power and supply temperatures. Using recuperation raises both supply temperature and COP. Fluid inventory control is experimentally confirmed to be a promising control strategy for closed-loop Brayton machines. It widens the operational envelope towards part load operation at constant supply temperatures while maintaining constant efficiency. Operating points in the compressor map remain on the same operating line, thus compressor stability is not impacted by this control method.
elib-URL des Eintrags: | https://elib.dlr.de/216351/ | ||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||
Titel: | Experimental Performance Analysis of a 50 kW Brayton Turbomachine Heat Pump Demonstrator | ||||||||||||||||
Autoren: |
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Datum: | 10 August 2025 | ||||||||||||||||
Erschienen in: | 70th ASME Turbo Expo 2025: Turbomachinery Technical Conference and Exposition, GT 2025 | ||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||
Open Access: | Nein | ||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||
DOI: | 10.1115/GT2025-152419 | ||||||||||||||||
Verlag: | The American Society of Mechanical Engineers (ASME) | ||||||||||||||||
ISBN: | 978-0-7918-8880-3 | ||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||
Stichwörter: | high-temperature heat pump, post-fossile industry, experimental analysis, fluid inventory control | ||||||||||||||||
Veranstaltungstitel: | ASME Turbo Expo 2025: Turbomachinery Technical Conference and Exposition | ||||||||||||||||
Veranstaltungsort: | Memphis, Tennessee, USA | ||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||
Veranstaltungsbeginn: | 16 Juni 2025 | ||||||||||||||||
Veranstaltungsende: | 20 Juni 2025 | ||||||||||||||||
Veranstalter : | The American Society of Mechanical Engineers (ASME) | ||||||||||||||||
HGF - Forschungsbereich: | Energie | ||||||||||||||||
HGF - Programm: | Materialien und Technologien für die Energiewende | ||||||||||||||||
HGF - Programmthema: | Thermische Hochtemperaturtechnologien | ||||||||||||||||
DLR - Schwerpunkt: | Energie | ||||||||||||||||
DLR - Forschungsgebiet: | E SP - Energiespeicher | ||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | E - Dekarbonisierte Industrieprozesse | ||||||||||||||||
Standort: | Cottbus | ||||||||||||||||
Institute & Einrichtungen: | Institut für CO2-arme Industrieprozesse > Hochtemperaturwärmepumpen | ||||||||||||||||
Hinterlegt von: | Oehler, Johannes | ||||||||||||||||
Hinterlegt am: | 24 Sep 2025 16:21 | ||||||||||||||||
Letzte Änderung: | 24 Sep 2025 16:21 |
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