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New copper-based heat exchangers for R744 refrigerant. 2 : System design and case studies.

Number: pap. n. 5

Author(s) : SHABTAY Y., BLACK J. R. H., COTTON N. D.

Summary

Part I presented critical information on how round inner-grooved small-diameter copper tube and newly developed flat copper microchannel tube can be used with alternative refrigerants and especially CO2. Seamless copper tubes with or without inner-grooves can be fabricated from a high-strength copper-iron alloy, reducing wall thickness and thus cost. Corresponding fittings made from the high strength alloys are also available. Part II examines and presents critical information and case studies relating to system design. Since the volume of CO2 required to achieve the same cooling effect is much lower than for HFCs, components and tubing can be smaller than conventional installations. In practice, accommodating the high pressures of CO2 systems is advantageous because the smaller diameter tubes used to withstand higher pressures also reduce system size and materials requirements. CuFe2P alloy tubes at small diameters are further advantageous for use in high-pressure CO2 cascade, transcritical and secondary-loop refrigeration systems due to their high strength without increasing wall thickness in the transmission lines.

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Pages: 6 p.

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Details

  • Original title: New copper-based heat exchangers for R744 refrigerant. 2 : System design and case studies.
  • Record ID : 30014581
  • Languages: English
  • Source: 6th Conference on Ammonia and CO2 Refrigeration Technology. Proceedings: Ohrid, North Macedonia, April 16-18, 2015.
  • Publication date: 2015/04/16

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