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Experimental analyses of different control strategies of an R-410A split-system heat pump by employing a turbomachinery expansion recovery device.

Author(s) : BARTA R. B., ZIVIANI D., GROLL E. A.

Type of article: IJR article

Summary

With increasing need for energy efficient vapor-compression cycles (VCCs), researchers have investigated different aspects of such systems to increase performance. The goal of this research is to experimentally investigate the design and control of a turbomachine expander to recover work and control the VCC. An R-410A split-system heat pump experimental setup has been utilized to compare the performance and control capabilities of a variable nozzle and a fixed nozzle with phase separation combined with evaporator bypass flow metering. A theoretical analysis on the benefit of the expander in heat pumps motivated heat pump operation in cooling mode. The variable nozzle experiments yielded a significant decrease in expander isentropic efficiency, and the evaporator bypass control led to an increase in system coefficient of performance (COP) of 2.3% with an expander overall isentropic efficiency of 18.8%. Compressor suction superheat control was achieved with the evaporator bypass over a range of ambient conditions.

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Pages: 189-200

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Details

  • Original title: Experimental analyses of different control strategies of an R-410A split-system heat pump by employing a turbomachinery expansion recovery device.
  • Record ID : 30027394
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 112
  • Publication date: 2020/04
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2019.12.027

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