Problem of the air separation pre-cooling unit not cooling
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This post was last edited by you*n*nyou on 2011-9-3 21:48. One of our air separation units has recently developed a problem: the pre-cooling unit is unable to perform its pre-cooling function. Some people say that there isn’t enough Freon inside, but adding more didn’t help either. I’d like to know more about this issue
Please provide the data from your current operation, such as the high and low pressures of the refrigerant, as well as any abnormal conditions. It’s impossible to make a judgment without this information
There are many problems with air separation pre-cooling units; a lack of Freon is one of the causes, along with many others such as low-temperature scaling. The poster should provide specific operating parameters of the pre-cooling units in order to make a judgment.
Original poster, you might want to check if there is scaling; this has a significant impact on the pre-cooling effect! ! ! (Please give this special consideration)
Check for refrigerant leaks, any leaks in the heat exchanger core, whether the expansion valve is clogged, and whether the amount of cooling water is insufficient
The most likely cause is a refrigerant leak, but adding more refrigerant should help, or maybe air has gotten inside. The poster, please share the high and low pressures of the refrigerant in your equipment – can the high pressure of the refrigerant increase?
1. Check whether the water flow in and out of the condenser is normal, and compare the temperature with normal levels; if it is very hot, it indicates that the amount of water flowing through is low, and thus the heat from the refrigerant cannot be effectively removed. Investigate whether there is any blockage in the valves or the heat exchanger. 2. The pressure gauge should show abnormal readings in case of a refrigerant leak; if a leak is indeed present, locate it and repair it, then maintain the pressure with nitrogen, and finally refill after evacuating the space. 3. The refrigerant may also involve less in the cycle due to being too cold (frost can be seen on the pipes). 4. Is the thermal bypass set too high? As mentioned above, the expansion valve, whether the refrigerant filter is clogged, and the system’s self-protection functions.
What was said upstairs makes a lot of sense. If necessary, ask the manufacturer to come and check the cause; this might resolve the issue more quickly.
Check for refrigerant leaks, as well as any leaks in the heat exchanger core. Verify whether the expansion valve is clogged, and ensure that there is sufficient flow of cooling water. 1. Check whether the water flow in and out of the condenser is normal, and compare the temperature to normal levels; if it’s very high, it indicates that insufficient water is flowing through, preventing the heat from the refrigerant from being effectively removed. Look for blockages in the valves or the heat exchanger. 2. The pressure gauge should show abnormal readings in case of a refrigerant leak; if a leak is indeed present, locate it and repair it, then maintain the pressure with nitrogen, and finally refill after evacuating the space. 3. The refrigerant may also involve less in the cycle due to being too cold (frost can be seen on the pipes). 4. Is the thermal bypass set too high? As mentioned above, the expansion valve, whether the refrigerant filter is clogged, and the system’s self-protection functions.