Air conditioning radiator coil leak detection problem
Thread Content
Due to the harsh usage environment, the Carrier central air conditioning radiator coil (copper material) often leaks where the fixed plate (steel material) contacts, and this situation is not easy to detect (the space is too small). I once searched for Guangzhou leak detection agent manufacturers on the Internet and wanted to use their fluorescent agent leak detection method to reduce the difficulty of our leak detection work. It was found that fluorescent agent appeared in almost all weld joints. Is it because the air conditioner is old and needs repair welding in many places, or is there a problem with this leak detection method? Even if there is a fluorescent display for leak detection. The pressure-holding effect of the system is still good. Has anyone encountered such a problem?
Can your fluorescent agent leak detection be quantitatively detected? Generally speaking, a small amount of leakage from the system is allowed. In addition, if the unit is old, crevice corrosion at the copper tube brazing area will still have a certain impact, so it is best to conduct quantitative testing and select repair welding based on the degree of leakage.
It is a semi-quantitative detection method. It can be roughly determined based on the amount of leakage. I haven't used this leak detection method before, so I think it's wrong if there is a leak (there is a fluorescent display). It seems that the coil is still allowed to have a small amount of leakage. However, so many leaking points still reflect that the radiator is almost time to be replaced. Thank you!
Depending on how long your equipment has been used, it should be about three to five years before there are any major problems. You can try to repair a few relatively large leaks that you measured first, and then see the effect. In addition, when you say that the contact areas often leak, do you mean there is leakage at the welding points?
The contact area that often leaks is not at the welding point, but a little away. The leakage in this area is very troublesome and cannot be repaired by welding, so the branch can only be cut off and closed. Each time it is equivalent to losing part of the heat dissipation capacity of the radiator. It is estimated that the contact between copper and iron quickly causes iron corrosion, and then the corroded rust causes wear and tear on the copper pipe under vibration. Are there other causes?
The contact between copper and iron will accelerate the corrosion of iron, and the smaller density of iron oxide will make the contact gap smaller, thereby aggravating wear. However, the vibration of the radiator itself should be a problem that needs to be considered. If the vibration of the radiator itself (from the vortex vibration of the fluid in the tube, etc.) is already large, then the wear of the copper tube will be inevitable. You have blocked a certain pipe, and if the flow rate does not change much, the flow rate in the single pipe will inevitably increase. If the flow rate exceeds the design allowable flow rate of the radiator, vibrations such as eddy currents in the pipe will intensify. Therefore, it is recommended that you directly consult the manufacturer for detailed information and let them help you make suggestions.