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世界上许多国家在三十年代和六十年代期间所建的多层冷库,都一直用到现在。那时所设计的冷库隔热层已不符合现在的实用要求,主要原因有两个方面:一是防汽层失效导致隔热层受潮或者结冰;二是以前设计的隔热层厚度不足,与现有工况不相适应。比如,以往的库房温度为-12～-18℃,而现在为-25℃～-30℃。因此能量损失明显增大,还经常造成相当严重的结构部分的破坏。如果照常规方法更新隔汽层和隔热层,施工中必然耗费很长时间,而且只能在冷间停产后进行。另外,完成升温、做隔汽层、加隔热层和建筑抹面等,还要用几个月的时间,所造
Multi-storey cold storage built by many countries in the world during the 1930s and 1960s has been used until now. At that time, the design of cold storage insulation layer has not meet the practical requirements now, there are two main reasons: First, the anti-vapor barrier failure led to insulation damp or icy; Second, the thickness of the insulation layer is less than the previous design, Incompatible with the existing conditions. For example, the temperature of the former warehouse is -12 ~ -18 ℃, and now is -25 ℃ ~ -30 ℃. As a result, energy losses are significantly increased, often causing quite severe structural damage. If the conventional method to update the vapor barrier and insulation layer, the construction will inevitably take a long time, and can only be carried out after the cold shutdown. In addition, the completion of heating, so every layer, plus insulation and building surfaces, but also with a few months time, made