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Design and simulations of refrigerated sea water chillers with CO2 ejector pumps for marine applications in hot climates.

Number: pap. 1244

Author(s) : BODYS J., SMOLKA J., BANASIAK K., et al.

Summary

Various system configurations and control strategies were developed in order to improve performance of R744 systems in hot ambient conditions. However, stationary land applications are characterised by negligible limits of space for system equipment as in the case of marine industry, i.e. fishing vessels. CO2 refrigeration system for fishing vessels are developed by Kuldeteknisk AS. Namely, Refrigerated Sea Water Chillers operation at Norwegian coast confirmed successful application of this approach. In this study, modified layouts are evaluated for operation in warmer climates without the need for an additional compressor unit, to maintain the compactness of the unit. The flash gas valve-, parallel compression- and multi-ejector system was numerically investigated. Moreover, each system was equipped in the liquid ejector section enabling a flooded operation of the evaporator. Sea water temperatures as occurring in Mediterranean and East-Asian waters were investigated. Both the optimal high-pressure as well as the pressure level in an intermediate pressure receiver are controlled to achieve low energy consumptions. Finally, up to 70% of performance improvement was obtained in the case of the most advanced installation working in warm East-Asian waters. The obtained results showed that the proper design of the system should ensure no necessity of an additional compressor in warmer climates still maintaining the designed cooling capacity.

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Details

  • Original title: Design and simulations of refrigerated sea water chillers with CO2 ejector pumps for marine applications in hot climates.
  • Record ID : 30023641
  • Languages: English
  • Source: 13th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2018). Proceedings. Valencia, Spain, June 18-20th 2018.
  • Publication date: 2018/06/18
  • DOI: http://dx.doi.org/10.18462/iir.gl.2018.1244

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