Low-temperature chiller is a kind of industrial chiller. It is a refrigeration equipment that can provide a cold source below 0°C. Generally, it refers to the use temperature between minus 5°C and minus 35°C. The refrigerant can be ethylene glycol aqueous solution, alcohol, Alcohol-based refrigerants such as ternary mixed solutions can also design the evaporator according to anti-corrosion requirements, and use calcium chloride aqueous solution with a higher concentration. The low-temperature chiller injects a certain amount of water into the internal water tank of the machine, cools the water through the refrigeration system, and then the circulating water pump inside the machine injects the low-temperature frozen water into the equipment that needs to be cooled, and the frozen water takes away the heat inside the equipment , and then the high-temperature hot water flows into the water tank again to cool down.
During the operation of the low-temperature chiller, it is very important for the operator to detect the fault phenomenon in time, which is very important to avoid more serious consequences or damage to other components of the system. Tripp sorts out some common system failure phenomena and treatment methods encountered in actual work as follows:
1. The pressure is high, and the exhaust should be exhausted. There may be thermal issues.
When it is detected that the high and low pressure of the system are higher than normal, there is usually too much air or refrigerant added to the system. At this time, it is necessary to re-evacuate, and then add an appropriate amount of refrigerant to solve this problem. However, there are also cases of poor heat dissipation, especially when the ambient temperature is high, the heat dissipation is often poor. The cause of the failure is generally the blockage of the radiator, dirt pollution, insufficient cooling fan speed, etc.
2. The pressure is doubled low and the refrigerant is lost, otherwise the system will shut down.
When both high and low pressure are low, there are two possibilities:
(1) When the system is blocked, the blocked part will cause throttling, and the throttling part will have an obvious temperature difference, and the problem can be found manually.
(2) Refrigerant leakage, resulting in insufficient refrigerant. This situation is more common. At this time, a low temperature chiller detector must be used to find leaking parts for repair.
3. If the low pressure is high and the high pressure is low, replace the compressor.
When using the low-temperature chiller pressure gauge to detect that the low pressure of the low-temperature chiller system is higher than normal and the high pressure is lower than normal, the cooling of the chiller will never achieve the effect of a normal low-temperature chiller. The most likely reason is that the chiller pump is worn out, resulting in a drop in power. At this time, it is often necessary to replace the compressor to solve the problem.
4. When there is water vapor in the shaker system, it must be evacuated more thoroughly.
When the cryogenic refrigeration system is working, if the meter needle keeps shaking, there is moisture in the system. To solve this problem, it is usually necessary to re-evacuate, and the pumping time should not be less than 15 minutes. If necessary, it needs to be replaced and cleaned to completely remove the water in the system.