Patent ID: 11965688
Assignee: THEMRO KING LLC
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  B | IPC F

Claim 0:
1. A transport refrigeration unit comprising:
an enclosed cargo space;
an outer refrigeration cycle configured to transfer heat from the cargo space exteriorly of the cargo space, to cool the cargo space, the outer refrigeration cycle extending through a condenser positioned for rejecting heat to external air and an evaporator positioned for transferring heat from a controlled environment within the enclosed cargo space;
a container installed within the cargo space;
an inner refrigeration cycle configured to transfer heat from an interior of the container, to cool the interior of the container, the inner refrigeration cycle extending through a condenser positioned for rejecting heat from the inner refrigeration cycle and an evaporator positioned for transferring heat from the interior of the container; and
a first stage cycle of a cascade refrigeration cycle which is configured to reject heat exteriorly of the cargo space, the first stage cycle extending through the condenser positioned for rejecting heat to external air such that said condenser is in common between the outer refrigeration cycle and the first stage cycle, wherein
the inner refrigeration cycle forms a second stage cycle of the cascade refrigeration cycle,
an inter-stage heat exchanger is provided between the first stage cycle and the second stage cycle.