Advantages and disadvantages of screw chiller and centrifugal chiller

Compressor type: piston chiller, screw chiller and centrifugal chiller

  1. Screw chiller

advantage:

  1. Simple structure, less moving parts, less wearing parts, only 1/10 of piston type, low failure rate and long life.
  2. Smooth circular motion, no “surge” phenomenon during low load operation, low noise and low vibration.
  3. The compression ratio can be as high as 20, and the EER value is high.
  4. Convenient adjustment, stepless adjustment within the range of 10% to 100%, high efficiency at part load, and significant power saving.
  5. Small size and light weight, can be built into a fully enclosed large capacity unit.
  6. Not sensitive to wet stroke.
  7. It belongs to positive pressure operation, and there is no problem of external air intrusion and corrosion.

    Advantages and disadvantages of screw chiller and centrifugal chiller

    Advantages and disadvantages of screw chiller and centrifugal chiller

Disadvantages:

  1. The price is higher than the piston type.
  2. The capacity of the single machine is smaller than that of the centrifugal type, and the rotation speed is lower than that of the centrifugal type.
  3. The lubricating oil system is more complicated and consumes more oil.
  4. Large-capacity unit has higher noise than centrifugal type.
  5. High machining accuracy and assembly accuracy are required.
  6. Centrifugal chiller

Advantage:

  1. The impeller has high rotation speed, large gas transmission volume and large single machine capacity.
  2. Fewer wearing parts, reliable work, compact structure, stable operation, small vibration and low noise.
  3. The weight index per unit cooling capacity is small.
  4. No lubricant is mixed in the refrigerant, and the heat transfer performance of the evaporator and the condenser is good.
  5. The EER value is high and the theoretical value can be reached. 6.996. Easy adjustment, stepless adjustment within 10% ~ 100%.

Disadvantages:

  1. The single-stage compressor will appear “surge” phenomenon at low load and run smoothly at full load.
  2. Strict requirements on material strength, processing accuracy and manufacturing quality.
  3. When the operating conditions deviate from the design conditions, the efficiency decreases faster, and the cooling capacity decreases faster than the piston type as the evaporation temperature decreases.
  4. Centrifugal negative pressure system, outside air is easy to invade, there is a risk of chemical changes corroding pipelines.

Geson chiller product range covers Industrial Refrigeration and Commercial Central air-conditioning, including Water-cooled chillers, Air-cooled chillers, Screw chillers, Scroll chillers, Centrifugal chillers, Water(ground) source heat pumps, Air source heat pumps and etc., Capacity from 2tons~4000tons, and temperature from -160℃~30℃, complete full product series for customers.

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