First，Cold storage design
Some design units and individual designers, due to some misunderstanding of the cold storage insulation layer, from the beginning of the design of the working principle of the cold storage and the outside environment on the cold storage operation has a confusing understanding that the cold storage of waterproof air insulation layer to do or not to do, the cold storage insulation effect is not great, and some even think that do or not to do, with what material there is not much difference, so the design is not in place.
Second, cold storage construction unit bias
Cold storage construction unit bias is the main reason for the problem. For example, a cold storage construction unit using on-site spray polyurethane pay foam insulation material, but do not set the gas insulation moisture-proof layer, and even some cold storage masonry does not rub cement mortar, direct spray polyurethane cool foam layer. They mistakenly think that the hard bubble will be since the crust, do not know that each spraying will destroy the crust layer, cold and hot water vapor basically in the absence of barrier, insulation layer is seriously damaged, library temperature is quite unstable, to cold storage operation brings great difficulties.
Third, the construction control is not strict
In the construction process, some functional departments are not strict control is also one of the main reasons. The relevant national norms and operating procedures for the construction of cold storage have not attracted the attention of the relevant departments. The State Technical Supervision Bureau promulgated the “cold storage design specification” listed in a section of the “storage room insulation against moisture”. When the temperature difference between the two sides of the enclosure is equal to or greater than 5°C, the air insulation layer should be set on the side with higher temperature. But this article is not listed as a mandatory requirement, so the implementation is not strict. Coupled with the cold storage from design to construction of waterproof and gas insulation awareness is not in place, to the operation of Chinese cold storage enterprises have brought very serious losses.
Post time: Jun-07-2023