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Improving energy efficiency in operation of CO2 RSW system for fishing vessels.

Number: pap. ID: 176

Author(s) : ANDRESEN T., LADAM Y., GILBERG A. F., et al.

Summary

Cooling and freezing are critical processes in the fishing industry. They ensure proper quality of high value products. They also are responsible for a significant fraction of the total energy consumption. Traditionally, cooling on boat is achieved using refrigerated sea water (RSW) refrigeration plants with halocarbon R22 as working fluid. Usage of this fluid is already limited to refill, and it will be totally banned from 2015. The main alternative is ammonia, but has significant drawbacks that can be unacceptable, particularly for smaller vessels. Carbon dioxide (CO2) is an environmental friendly, non toxic, non flammable alternative. A 400 kW CO2 RSW plant has been investigated in the geometry based in-house simulation tool CSIM. Quasi steady-state cooling of catches has been simulated for two typical conditions: herring fishing in winter and mackerel fishing in the North Sea in late summer. Optimized operation was sought for either minimal cooling time or lowest energy consumption. In winter operation, an improved solution showed approximately 40% less compressor work compared to the baseline on the expense of longer cooling time. The cooling capacity can also be increased on expense of the COP if the high side pressure is raised. This might be necessary if the time available for pre-cooling is shorter than expected.

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Details

  • Original title: Improving energy efficiency in operation of CO2 RSW system for fishing vessels.
  • Record ID : 30001096
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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