Liquid nitrogen wash cooling box bare cooling
Thread Content
May I ask to what temperature the cryogenic chamber needs to be cooled for bare cooling using liquid nitrogen? How is this temperature determined? Some sources mention the use of liquid nitrogen; so, if only medium-pressure nitrogen is used for cooling, what is the lowest temperature that can be achieved?
This should be asked to the manufacturer of the liquid nitrogen cooling box. Some manufacturers require bare cooling, while others do not. Basically, medium-pressure nitrogen is used.
Generally, it’s sufficient to cool it down to -70 degrees; this is specified in the operation manual.
Floating World Bonds 16: Are you Old Li?
Generally, temperatures of -50 to -60 degrees are sufficient; we are from Global Company.
Someone once used air natural cooling... and it worked too!
As long as the dew point of the medium you use is low enough, it doesn’t matter what kind of bare cooling is used. To meet the requirements, liquid nitrogen cooling is generally used.
Both air and nitrogen can be used as media for cryogenic cooling. The temperature that can be achieved depends mainly on the efficiency of throttling refrigeration in the cryogenic tank, as well as the amount of gas emitted from various process lines. Generally, it is cooled only to -70, and then allowed to return to room temperature for inspection. When the normal bare cooling temperature is on the high side, it is not allowed to directly add liquid nitrogen for cooling.
I would like to ask the experts here: how long does it take to cool down using nitrogen, from the start of the cooling process until the temperature reaches -50 to -60 degrees? Then, at this temperature, is it necessary to maintain it for a while? If needed, how long will it take? Then, if the temperature rise is a natural re-warming process, how long does it take to return to normal temperature? If anyone has driving experience, please share your insights
The temperature of cryogenic conditions is primarily determined by measuring the dew point; the time required to reach temperatures of minus 50 or 60 degrees depends on the amount of high-pressure nitrogen used, the pressure controlled inside the cryostat, as well as the temperature difference across the surfaces of the heat exchangers