How to troubleshoot the chiller refrigeration system

How to troubleshoot the chiller refrigeration system

The intercooler of the chiller is suitable for the refrigeration system of two-stage or multi-stage compression chillers. It is connected between the low-pressure exhaust pipe and the high-pressure suction pipe to avoid excessively high exhaust temperature of the high-pressure compressor of the chiller. The refrigerant liquid is supercooled before entering the evaporator.

　　In the chiller, the high-pressure liquid refrigerant from the condenser enters the intercooler in two ways: one way into the serpentine coil, and the other way into the container shell and the space outside the coil. The intercooler has three functions: one is to reduce the low-pressure exhaust temperature of the chiller; the other is to separate the lubricating oil entrained in the low-pressure exhaust of the chiller; the third is to cool the liquid refrigerant in the serpentine coil to make it supercool. Therefore, the intercooler is a heat exchanger between refrigerants in the chiller.

　　 It is very important that the refrigerant level in the intercooler is kept constant. For example, an ammonia two-stage compression chiller, the intercooler used in the system uses a float valve or a liquid level controller and a liquid supply solenoid valve as the liquid supply device. The Freon two-stage compression chiller uses a thermal expansion valve as the liquid supply device for its intercooler.

　　 In addition, the chiller needs regular maintenance work. If the operation time is too long, or due to the decomposition of refrigerating oil, refrigerant, or air leakage, these factors will increase the condensation pressure of the condenser and reduce the cooling efficiency. Therefore, it is very important to regularly maintain, overhaul and troubleshoot the chiller. The editor below okmarts.com will give you a brief introduction to some troubleshooting tips for the chiller refrigeration system.

　　1. Exhaust at double pressure, heat dissipation may be problematic.

　　 When the high and low pressure of the system are higher than normal, it is generally because air enters the system or excessive refrigerant is added. At this time, it is necessary to re-evacuate and add proper amount of refrigerant to solve the problem. Another situation is poor heat dissipation, especially when the ambient temperature is relatively high, which often results in worse heat dissipation. The cause of this failure is generally blockage of the heat sink, dirt, and insufficient speed of the cooling fan.

　　2, the pressure is double low loss refrigerant, otherwise the system will be shut down.

　　 When both high and low pressure are low, there are two possibilities:

　　 (1) The system is blocked, the blocked part will produce throttling, and the throttling part will have a significant temperature difference. You can find the problem by feeling it with your hands.

　　 (2) The leakage of refrigerant leads to insufficient refrigerant. This situation is more common. At this time, a chiller detector must be used to find out the leaking location and perform replacement.

　　 3. Low pressure, high pressure, low pressure, replace the compressor.

　　 When the chiller pressure gauge detects that the low pressure of the chiller system is higher than normal, and the high pressure is lower than normal, the chiller refrigeration at this time absolutely cannot achieve the effect of the normal chiller. The reason is likely to be the wear and tear in the chiller pump, resulting in a drop in power. At this time, it is often necessary to replace the compressor to solve the problem.

　　 4. There is water vapor in the meter shake system, so the evacuation must be more thorough.

　　 When the chiller system is working, if the pressure gauge needle keeps shaking, it means that the system has moisture. To solve this problem, the vacuum must be re-evacuated, and the pumping time must be no less than 15 minutes. If necessary, the drying bottle must be replaced to completely drain the water in the system.