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Thermodynamical analysis of two-phase water steam ejector in high-temperature heat pumps cycles.

Number: 1160

Author(s) : ABU KHASS O., KLÖPPEL S., TRAN A. P., STATHOPOULOS P., NICKE E.

Summary

Industrial processes often require high-temperature heat, yet conventional methods contribute significantly to carbon emissions. High-temperature heat pumps (HTHPs) using natural refrigerants like water present a sustainable alternative, capable of generating process heat up to 200°C. However, achieving these temperatures requires advanced turbomachinery systems. This study investigates the innovative application of two-phase water ejectors in HTHPs, particularly their role as the first stage of compression, creating a sub-atmospheric pressure at the ejector inlet. This approach can enhance the cycle coefficient of performance (COP) across various Rankine cycle-based HTHPs, including single and two-stage cycles. By employing thermodynamic heat pump models and a 1D ejector model, the paper benchmarks cycle performance against a German Aerospace Centre (DLR) reference case, specifically targeting steam compression up to 200°C. Findings indicate that water ejectors can simplify HTHP systems while maintaining high efficiency. This novel use of ejectors marks an advancement in sustainable high-temperature industrial heating solutions.

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Pages: 10 p.

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Details

  • Original title: Thermodynamical analysis of two-phase water steam ejector in high-temperature heat pumps cycles.
  • Record ID : 30032681
  • Languages: English
  • Source: 16th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2024). Proceedings. University of Maryland, College Park, Maryland, USA, August 11-14 2024
  • Publication date: 2024/08
  • DOI: http://dx.doi.org/10.18462/iir.gl.2024.1160

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