冷干机是冷冻式干燥机的简称，是压缩空气系统中的干燥设备；冷干机价格低廉但非常重要，所以了解冷干机的技术参数及应用效果有助于企业做出良好的采购预估。
1.压力露点（干燥效果单位）
冷干机可以将压缩空气中90%左右的水份都分离掉，通过冷干机处理过后的压缩空气一般可以达到3°C-10°C的压力露点；
这就是冷干机最重要的一项技术参数：压力露点。
压力露点是压缩空气干燥度的单位，如果达不到某个特定的值，就无法满足某项生产工艺要求（每个行业都有其压缩空气干燥度标准）。
2.处理流量和处理压力
所以，选型的最终目的都是：通过冷干机处理的压缩空气能够满足生产需求。
那么就涉及到另一项技术参数：冷干机的处理流量和处理压力；
比如某车间用气量为5立方每分钟（m3/min），末端压力0.7公斤（mPa），压缩空气主要用于贴片机和零件吹扫。
大多数冷干机厂家会建议配置6-8立方处理流量的冷干机，而不少用户都会因为省钱选择5立方的冷干机。这并不是开玩笑，这是普遍存在的现象，我们每年夏天都会接到数不胜数的客户电话，诉苦当初没有买大一点的冷干机。
那么为什么冷干机厂家要这样建议？
因为高温天气的存在，以及有时候需要大负荷运转空压机的情况，都会导致冷干机负载，而负载带来的结果就是后端大量出现液态水，甚至停机停工。
经历过这种情况的用户，基本上以后都不会在冷干机的选型上省钱了。
冷干机按照处理压力的不同分为两种：常压冷干机、高压冷干机；
压缩空气压力大于12公斤（1.2mPa），就需要使用高压机型。
3.环境温度、进气温度
空压站的环境温度和压缩空气进入冷干机的温度同样是影响冷干机干燥效果的重要参数；
一般要求是环境温度小于40°C，进气温度小于38°C。
环境温度过高会导致冷媒散热不完全，进气温度过高会导致含水量过高以及降温效果变差；
进而致使干燥效果大大下降。
以上便是冷干机最关键的几类技术参数，是压缩空气用户在冷干机选型中绝对不能避开的几点技术参数。
Cold dryer is the abbreviation of freeze dryer, is the compressed air system drying equipment; The price of the cold dryer is low but very important, so understanding the technical parameters and application effect of the cold dryer can help enterprises to make a good procurement estimate.
1. Pressure dew point (unit of drying effect)
The cold dryer can separate about 90% of the water in the compressed air. The compressed air processed by the cold dryer can reach the pressure dew point of 3° c-10 °C.
This is the most important technical parameters of the cold dryer: pressure dew point.
The pressure dew point is a unit of the degree of dryness of compressed air, and if it does not reach a certain value, it cannot meet the requirements of a certain production process (every industry has its standard of the degree of dryness of compressed air).
2. Handle flow and pressure
Therefore, the ultimate purpose of model selection is: the compressed air processed by the cold dryer can meet the production demand.
Then it involves another technical parameter: the treatment flow and treatment pressure of the cold dryer;
For example, the air consumption in a workshop is 5 cubic meters per minute (m3/min) and the terminal pressure is 0.7 kg (mPa). The compressed air is mainly used for SMT mounters and parts purging.
Most cold dry machine manufacturers will recommend the configuration of 6-8 cubic meters to handle the flow of the cold dry machine, and many users will choose to save money by 5 cubic meters of cold dry machine. It's not a joke, it's a universal phenomenon, and we get tons of calls every summer from customers complaining that they didn't buy a bigger dryer.
So why is the cold dryer manufacturer suggesting this?
Because of the existence of high temperature weather, and sometimes need a large load to run the air compressor, will lead to the load of the cold dry machine, and the result of the load is a large number of liquid water at the back end, or even shut down.
Experienced the user of this kind of situation, basically won't be in the cold dry machine type selection to save money.
According to the different treatment pressure is divided into two types: atmospheric cold dry machine, high pressure cold dry machine;
Compressed air pressure greater than 12 kg (1.2mPa), the need to use high-pressure models.
3. Ambient temperature and inlet temperature
The ambient temperature of air compressor station and the temperature of compressed air entering the cold dryer are also important parameters that affect the drying effect of the cold dryer.
The general requirements are that the ambient temperature is less than 40°C and the intake temperature is less than 38°C.
Too high ambient temperature will lead to incomplete cooling of refrigerant, too high intake temperature will lead to too high water content and poor cooling effect;
The drying effect is greatly reduced.
The above is the most critical several types of technical parameters of the cold dry machine, is the compressed air user in the cold dry machine selection absolutely can not avoid a few technical parameters.
