Delft University of Technology
Faculty Mechanical, Maritime and Materials Engineering Transport Technology
G.M.H. Huls Koel- en vriescontainers; koelmethoden tijdens zeetransport, opslag en doorvoer. Literature survey, Report 93.3.TT.3089, Transport Engineering and Logistics.
Two types of containers are used in the process of refrigerated container transport:
The integrated reefer container. This reefer has its own refrigeration equipment built in.
The port-hole container. This type of container has no refrigeration equipment built in and is dependent on an external supply of refrigerated air. The chilled air is supplied by a ducting system through an inlet in the container and the warmed-up air leaves the container by an outlet.
The majority of the reefers needs an external power supply. That is why they are also known as 'plug-ins'. During sea-transportation as well as during storage these plug-ins have to be connected to a power supply. During transit transportation these plug-ins are seldomly being refrigerated.
During sea tranportation the port-hole container is being refrigerated by a central refrigeration machinery. This circulates the air to and from the port-hole container through pipes and couplings. During storage the port-hole container is being refrigerated in a similar way. The port-hole container is also rarely being refrigerated during transit transportation.
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