Maintenance of the evaporator

08-03-2020

      a. For stand-pipe and spiral-tube evaporators, check the mixer, chilled water pump, and other interfaces for leaks before starting the system, and check whether the water level in the evaporator water tank is 100mm higher than the header on the evaporator.

      b. Monitor the refrigerant level. For piston compression refrigeration systems and screw compression refrigeration systems, the amount of refrigerant in the evaporator is too much or too little, which can be adjusted by adjusting the opening degree of the throttle valve in the system, and the float valve is used to maintain the proper liquid. Face height.

    c. Pay attention to check and monitor the outlet temperature of the frozen water of the evaporator.

safety valve

      When the chilled water outlet temperature of the evaporator is too high, the following measures can be taken:

    1. Increase energy regulation, such as increasing the number of operating cylinders of a piston refrigeration compressor.

    2. If the difference between the chilled water effluent temperature and the evaporation temperature of the system is too large during operation, it may be due to insufficient refrigerant charge or scale formation of the evaporator water pipe after long-term operation, and necessary treatment should be performed.

    3. If it is required to ensure that the specified chilled water temperature is provided first, and the chilled water temperature is high during the operation of the refrigeration unit, the amount of water entering the evaporator is appropriately reduced. After the chilled water effluent temperature reaches the specified temperature, the normal water supply is restored under other normal parameters.

solenoid valve

When the chilled water outlet temperature of the evaporator is too low, the following measures can be taken:

    1. Reduce energy regulation, such as reducing the number of operating cylinders of piston refrigeration compressors.

    2. If the refrigeration system is equipped with a freezing pond and a chilled water return pond, the passage between the chilled pond and the chilled pond can be opened to increase the temperature of the chilled pond, or add a certain amount of higher than freezing in the chilled water return pond. Tap water at water temperature, and then increase the temperature of the chilled water inlet water of the evaporator, so as to increase the temperature of the chilled water outlet water.

   3. If the unit needs to increase the chilled water outlet temperature quickly during operation, the amount of chilled water supply can be appropriately increased. After the chilled water temperature has reached the required value and other parameters are within the normal range, the Restore normal water volume.

shut off valve

      Monitor the amount of frozen water and water quality at any time during operation. During the operation of the unit, the water quality in the chilled water system should be analyzed regularly. Attention should be paid to the timely discharge of oil accumulation in the evaporator to prevent the influence of the oil film on the heat transfer coefficient.

safety valve

     Maintenance of the evaporator when it is not used for a long time If the evaporator is not used for a long time, the refrigerant in the evaporator should be pumped into the accumulator and stored, so that the pressure in the evaporator can be maintained at 0.05 ~ 0.07MPa (gauge pressure). ; Stand-pipe evaporator in the water tank, if the evaporator is not used for a long time, the water level in the tank should be 100mm higher than the gas collecting pipe on the evaporator; if it is a salt water evaporator, the salt water should be discharged out of the tank, the water tank should be cleaned, and then filled Tap water preservation; the cleaning and descaling of horizontal shell and tube evaporators is the same as that of water-cooled condensers. The ash and dirt between the surface evaporator ribs should be blown off with compressed air in time, and if necessary, cleaning agents can be used for cleaning.


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