冷干機是冷凍式干燥機的簡稱，是壓縮空氣系統(tǒng)中的干燥設(shè)備；冷干機價格低廉但非常重要，所以了解冷干機的技術(shù)參數(shù)及應(yīng)用效果有助于企業(yè)做出良好的采購預(yù)估。
1.壓力露點（干燥效果單位）
冷干機可以將壓縮空氣中90%左右的水份都分離掉，通過冷干機處理過后的壓縮空氣一般可以達到3°C-10°C的壓力露點；
這就是冷干機最重要的一項技術(shù)參數(shù)：壓力露點。
壓力露點是壓縮空氣干燥度的單位，如果達不到某個特定的值，就無法滿足某項生產(chǎn)工藝要求（每個行業(yè)都有其壓縮空氣干燥度標(biāo)準(zhǔn)）。
2.處理流量和處理壓力
所以，選型的最終目的都是：通過冷干機處理的壓縮空氣能夠滿足生產(chǎn)需求。
那么就涉及到另一項技術(shù)參數(shù)：冷干機的處理流量和處理壓力；
比如某車間用氣量為5立方每分鐘（m3/min），末端壓力0.7公斤（mPa），壓縮空氣主要用于貼片機和零件吹掃。
大多數(shù)冷干機廠家會建議配置6-8立方處理流量的冷干機，而不少用戶都會因為省錢選擇5立方的冷干機。這并不是開玩笑，這是普遍存在的現(xiàn)象，我們每年夏天都會接到數(shù)不勝數(shù)的客戶電話，訴苦當(dāng)初沒有買大一點的冷干機。
那么為什么冷干機廠家要這樣建議？
因為高溫天氣的存在，以及有時候需要大負(fù)荷運轉(zhuǎn)空壓機的情況，都會導(dǎo)致冷干機負(fù)載，而負(fù)載帶來的結(jié)果就是后端大量出現(xiàn)液態(tài)水，甚至停機停工。
經(jīng)歷過這種情況的用戶，基本上以后都不會在冷干機的選型上省錢了。
冷干機按照處理壓力的不同分為兩種：常壓冷干機、高壓冷干機；
壓縮空氣壓力大于12公斤（1.2mPa），就需要使用高壓機型。
3.環(huán)境溫度、進氣溫度
空壓站的環(huán)境溫度和壓縮空氣進入冷干機的溫度同樣是影響冷干機干燥效果的重要參數(shù)；
一般要求是環(huán)境溫度小于40°C，進氣溫度小于38°C。
環(huán)境溫度過高會導(dǎo)致冷媒散熱不完全，進氣溫度過高會導(dǎo)致含水量過高以及降溫效果變差；
進而致使干燥效果大大下降。
以上便是冷干機最關(guān)鍵的幾類技術(shù)參數(shù)，是壓縮空氣用戶在冷干機選型中絕對不能避開的幾點技術(shù)參數(shù)。
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.
