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Low charge ammonia systems designed as direct expansion.

Number: 0006

Author(s) : ELSTROM M.

Summary

Requirements to reduce global warming (GWP) and CO2 emissions lead to an increased desire for use of natural refrigerants. It is now possible to design Ultra Low Charge dry expansion systems, safer and more energy efficient than conventional DX, flooded and pump circulation systems. The desire to use the world’s most energy-efficient refrigerant, ammonia, in DX-designed refrigeration systems has led to many challenges and has rightfully earned the reputation of being a poor solution that does not always work well. There have been many problems, and over time, many attempts have been made without any significant breakthroughs. It was necessary to compromise the normal DX design and install liquid separators before the compressors and set superheating very high in order to avoid liquid flood-back and potential compressor damage. Inefficient/non-dynamic evaporators, poor compressor capacity control combined with ammonia’s high latent heat of vaporization have caused most of the challenges.

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Pages: 9

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Details

  • Original title: Low charge ammonia systems designed as direct expansion.
  • Record ID : 30028943
  • Languages: English
  • Source: 9th IIR Conference on Ammonia and CO2 Refrigeration Technologies. Proceedings: Ohrid, North Macedonia, 16-17 September, 2021
  • Publication date: 2021/09/16
  • DOI: http://dx.doi.org/10.18462/iir.nh3-co2.2021.0006

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