| 摘要 |
Insulated containers which conform relatively closely in size to the payload size, which contain a payload and phase change material and/or a refrigerated gel are all placed in a larger insulated shipping container, which may house additional phase change material and/or refrigerant. The combined insulating effect of the inner and outer containers allows minimizing the use of phase change material inside the inner container for the payload itself, and the presence of the phase material, together with the use of frozen gels inside the outer container, provides for only a small difference in temperature between the interior of the inner container and the interior of the outer container. The inner containers can be less insulated and lower cost, and the outer containers can be recycled.
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