针对我国冷库多、贮藏量大，但超低温冷库很少这一现状，介绍了在原有冷库的基础上，利用复叠式制冷方法将原有的部分冷库加装改造成超低温冷库，从而达到降低成本和节能的目的。

Some methods are introduced to rebuild the normal cold storages into super-low temperature cold storages for full use of cascade refrigeration cycle with low production costs and energy expenditure.

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