The refrigeration plant has shown to be at least one of the largest electricity consumer onboard a fishing vessel, usually assuming 50% of the total power plant. It is therefore natural that efforts on improving energy efficiency have to take into account this installation and try to provide solutions for the reduction of consumption.
In this paper a brief overview of the main types of refrigeration plants is made, identifying their characteristics and needs for each of the different types of fishing methods.
Also, existing technologies whose implementation would result in energy savings are revised. These solutions have to consider various aspects of the cooling process, as the design and analysis of freezing systems and the holds themselves, control systems, different refrigerants and the influence of environmental regulation in this area, as well as the use of alternative energies
such as the use of heat waste, either in absorption systems or Organic Rankine Cycles.