Insulated Cargo Container Structure for 72-Hour Temperature Hold
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Solution Overview
Problem
Existing cargo containers for temperature-sensitive materials face challenges in maintaining a narrow temperature range for extended periods without external power, while also requiring high thermal insulation and efficient construction to maximize cargo space and minimize heat transfer.
Innovation Solution
A cargo container design featuring a rigid aluminum outer housing with molded composite inner and outer shells, incorporating vacuum insulation panels, a refrigeration evaporator, electrical heating elements, and a control system powered by storage batteries, which ensures efficient temperature control and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the wall thickness is increased to improve thermal insulation, then heat transfer is reduced, but the cargo space is reduced
Solution Approach 1:
The patent employs composite wall construction combining aluminum panels with foam insulation layers (such as polyurethane or polystyrene) to achieve high thermal insulation performance. This composite structure provides effective heat transfer resistance while maintaining thinner overall wall thickness, thereby preserving maximum cargo space within the container.
2Loss of energy
If the wall thickness is increased to improve thermal insulation, then heat transfer is reduced, but the container construction complexity increases
Solution Approach 1:
The container walls are segmented into discrete panels with standardized insulation cores and aluminum facings. Each panel is pre-fabricated as a complete insulation unit, simplifying the overall construction process. The segmented panel design allows for modular assembly while maintaining consistent thermal insulation properties throughout the container structure.
3Ease of operation
If the container weight is reduced to improve handling efficiency, then ease of operation is improved, but structural strength and durability are reduced
Solution Approach 1:
The patent utilizes thin-gauge aluminum panels (typically 0.032 to 0.064 inches thick) for the container walls and doors. These thin aluminum shells provide sufficient structural strength and durability for normal handling operations while minimizing weight. The aluminum panels are reinforced at critical locations such as door frames and corner posts to maintain structural integrity despite the reduced material thickness.
4Ease of operation
If lighter materials are used to reduce container weight, then handling efficiency is improved, but thermal insulation performance is reduced
Solution Approach 1:
The container employs a composite wall structure consisting of lightweight aluminum panels combined with foam insulation materials such as polyurethane or polystyrene. This composite construction achieves both objectives: the aluminum provides structural strength and durability while the foam core delivers high thermal insulation performance. The resulting wall assembly is lightweight enough for efficient handling yet provides superior thermal protection for temperature-sensitive cargo.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The container maintains a consistent temperature within a narrow range for up to 72 hours without external power, providing high thermal insulation and durability, while minimizing energy consumption and weight, thus ensuring the safe transport of temperature-sensitive goods.
Implementation Method 1
Each cassette includes two or more layers of vacuum insulation panels
Implementation Method 2
the circulating air passes upwardly through a refrigeration evaporator
Implementation Method 3
the circulating air passes upwardly through a refrigeration evaporator and electrical heating elements
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A cargo container includes an outer aluminum housing having side, rear, bottom and top walls and a front opening with a pair of hinged doors. The housing receives a molded box-shaped composite outer shell which receives a molded box-shaped composite inner shell defining a cargo chamber. Corresponding walls of the inner and outer shells and the doors confine insulation cassettes each including vacuum insulation panels forming layers separated by a foam sheet and covered by corrugated plastic sheets, all wrapped with plastic film. Air is circulated within the chamber through a refrigeration evaporator and electrical heating elements, and a rear portion of the housing encloses a refrigeration compressor, storage batteries and a control system which senses the temperature within the chamber to operate the compressor and heating element from the batteries or an external power source to maintain substantially constant preselected temperatures within the chamber.