2017-03-21 11:43:38

低温冷库的温度是不是越低越好呢？
Low temperature cold storage temperature is, the lower the better?
低温冷库的温度是在-20°C以下，因为海产品和冷饮需要在-20°C以下才不会变质，低温冷库的特点是不定期逐步地将仪器放入冷库，经过一段时间冷库的温度达到-20°C，对这段时间没有特殊的要求，但是对库温是严格要求，在-18°C～-23°C之间就是典型的低温冷库，但储藏含乳制品的冷饮，库温应定在-20°C～-28°C即可，但这两种不同的温度需要不同等级的设备，设备投资有很大的差距。
Low temperature cold storage temperature is below - 20 ° C, because seafood and cold drinks need won't spoil under - 20 ° C, and the characteristics of the low temperature cold storage is not regular gradually the instrument into the cold storage, cold storage temperature reached over a period of time - 20 ° C, no special requirements to this period of time, but the library is strict with warm, in 18 ° C ~ 23 ° C - is a typical low temperature cold storage, cold drinks containing dairy products, but the storage library temperature should be set in - 20 ° C ~ - 28 ° C, but the two different temperature in different levels of equipment, equipment investment has very big disparity.
大多数专业制冷人士认为低温冷库的温度越低越好，冰存物的保存期限可以延长，但有时应依据各种物品所需要的保存温度而定，以蔬果类，过低的储藏温度易导致冻伤发生，而肉类产品温度低可保存较长时间。但以经济与能源观点来考虑，就应以保存时间长久来选择低温冷库储藏温度，如肉类在-18°C下可储存4-6个月，在-23°C下可存储8-12个月，因为肉类在5个月内就要到消费者手上，所以有时会考虑是否选择-23°C的保存温度，因此，低温冷库设计必须依存物的商品命周期，与其有效的保存环境来选择合适的保存温度。
Most refrigeration professionals think that the low temperature cold storage temperature, the lower the better, the shelf life of ice storage can be extended, but sometimes should be kept according to the various items required temperature and decide, with fruits and vegetables, easy cause frostbite, low storage temperature and low temperature meat products can save a long time. But with economic and energy point of view to consider, should choose to save the time for a long time to low temperature cold storage storage temperature, such as meat under 18 ° C can store 4-6 months, can be stored under - 23 ° C 8 to 12 months, because five months for consumers to have the meat, so sometimes will consider whether to choose - 23 ° C temperature, therefore, low temperature cold storage design must depend on content of product life cycle, and its effective the preservation of the environment to choose the appropriate temperature.
低温冷库预冷方法：
Low temperature cold storage method of precooling:
空气预冷：空气预冷方法具有空气温湿度易调节、可用于各种食品冷却冷藏运输、设备造价低等优点。
Air precooling: air precooling method is easy to adjust, air temperature and humidity can be used for various food cooling refrigerating transportation, equipment, low cost advantages.
真空预冷：依据水随压力降低其沸点也降低的物理性质，将预冷食品置于真空槽中抽真空，当压力降低到一定数值时，食品表面的水分开始蒸发，吸收汽化潜热，使食品自身被冷却的方法就是真空预冷方法。
Vacuum precooling: on the basis of water with the pressure to reduce its boiling point and lower physical properties, puts beforehand LengShiPin vacuum in the vacuum tank, when pressure is reduced to a certain value, the food on the surface of the water evaporated, the absorption of latent heat of vaporization, make the food itself by cooling method is the method of vacuum precooling.
水预冷：利用水将被冷却食品从初始温度降至到所需要的终点温度的方法称为水预冷方法。
Water precooling: using the cooling water will be the food from the end of the initial temperature dropped to the required temperature method is called water precooling.
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