Marine Refrigeration:

A particular feature of marine transport is the changing climate, ranging from tremendous hot to tremendous cold, through which the ship ought to pass throughout the course of its journey. The insulation and fittings must be appropriate both for hot and cold water routes. Therefore a vapour barrier for moisture must be provided on both of sides of the insulation. Corkboard continues to be favoured like insulation due to its many desirable characteristics, like fire-resistant property, structural strength, low permeability for moisture, etc.

In the particular case of cargo, the refrigeration system must be capable of providing any temperature between - 23.5 & 12.5°C. R 12 along reciprocating compressors is currently used as a refrigerant. R 22 is not suggested because of its difficulty of critical oil miscibility. Compound compression is worked out. Parallel operation is not suggested along R 12 like there is a tendency for oil to migrate & flood one compressor when starving another. By according, each of the evaporator contains an independent compressor. It involves the use of a big number of compressors. The system may be made more economical through the utilization of parallel brine circuits in chilly coils and fewer condensing units. Capacity control is getting by speed variation or cylinder cut-outs & cylinder unloading. Condensers are of the shell- and-tube kinds utilizing sea water for cooling.

Therefore Corrosion-resistant cupro-nickel material is utilized for tubes & end covers. A receiver capable of storing 20 % more additionally to the entire charge is necessary. The liquid line must emerge from both of the ends of the condenser, and afterwards joining into one. It ensures continuous draining of the liquid throughout roll or pitch of the ship.

Additionally to the cargo, ships ought to have their own stores. These stores need to be much bigger for passenger vessels. They also contain a ventilated area for some items, such as potatoes and onions.

Fishing vessels utilized ice for short distances from the shore, however deep-sea fishing trawlers that remain away for months together ought to have mechanical refrigeration.