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Thermodynamic analysis of a multi-evaporator refrigeration cycle using a two-phase ejector as an expansion device.

Number: 494

Author(s) : LAGURI V., KUMAR K., GUPTA P., KUMAR P., MV S. R., HAFNER A., ELARGA H.

Summary

This paper focuses on the thermodynamic and exergy analysis of a multi-evaporator propane refrigeration cycle. The system produces deep-freezing, refrigeration, and air-conditioning effects in a single unit with a single compressor. Besides being a natural refrigerant with zero ODP and a low GWP of 5, propane exhibits excellent thermophysical properties required for a refrigerant. It has a sufficiently high critical temperature of 96.75°C at a pressure of 43.01 bar. The system is supplemented with a two-phase ejector, which doubles up an expansion device and provides a pressure lift using the pressure energy from the high-pressure flow from the condenser to increase the suction pressure in the compressor. The geometry of the two-phase ejector arrived using the thermodynamics of a constant pressure mixing ejector. Exergy and energy analysis have been carried out for this novel cycle to access the performance parameters of the system. The cooling capacity of the MT evaporator is fixed at 20 kW. The paper presents the influence of ambient temperature (20°C to 50°C), LT evaporator temperature (-40°C to -10°C), MT evaporator (-15°C to 0°C), and AC evaporator (0°C to 15°C) on the performance of the proposed system. The results show that COP and exergetic efficiency of the proposed Multi-Evaporator Ejector Expansion Cycle (MEEEC) is 2.101 and 0.346, for an LT evaporator temperature (TE-01) = -40°C, MT evaporator temperature (TE-02) = -5°C, AC evaporator temperature (TE-03) = 5°C and condensing temperature (T3) = 55°C.

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Pages: 12

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Details

  • Original title: Thermodynamic analysis of a multi-evaporator refrigeration cycle using a two-phase ejector as an expansion device.
  • Record ID : 30031314
  • Languages: English
  • Subject: Technology, HFCs alternatives
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0494

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