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A saturation heat pump system for cold climate conditions.

Number: 1131

Author(s) : FIX A., GAO L., SEABOURNE T., YANG J., MUEHLBAUER J., HWANG Y., RADERMACHER R.

Summary

The current state-of-the-art Heat Pump (HP) systems encounter significant challenges in maintaining capacity and efficiency in extremely low-temperature environments. To address these inefficiencies, this paper presents the design of an innovative saturation HP system that incorporates two-phase injection. This advanced saturation cycle mitigates energy losses typically incurred during superheated gas compression and isenthalpic expansion, thus moving closer to the theoretical Carnot efficiency. A high-efficiency cold climate heat pump (CCHP) system is theoretically modeled, and the performance is studied when employing various low-GWP and natural refrigerants. The results show that a two-stage cycle using propane can improve the heating COP by 60% at an ambient temperature of -25℃. The refrigerant injection quality required to meet this performance ranges between 0.7-0.9, depending on the operating conditions and injection stage. Furthermore, the saturation cycle can reduce the final superheat temperature difference by over 100°C, compared to a single-stage heat pump in cold climates.

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Pages: 12 p.

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Details

  • Original title: A saturation heat pump system for cold climate conditions.
  • Record ID : 30032663
  • 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.gl2024.1131

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