NESTED COOLING ARRANGEMENTS FOR REFRIGERATED TRANSPORT

There is disclosed a transport refrigeration unit (100) comprising an enclosed cargo space (102), an outer refrigeration cycle (110) configured to transfer heat from the cargo space exteriorly of the cargo space, to cool the cargo space; a container (200) installed within the cargo space; and an inner refrigeration cycle (210) configured to transfer heat from an interior (202) of the container, to cool the interior of the container. There is also disclosed a portable refrigeration device for use in such nested cooling arrangements, methods of adapting a transport refrigeration unit and/or portable refrigeration device for such use, a refrigeration module for such use, and an associated method of operating a transport refrigeration unit.