Advantages and disadvantages of screw chiller and centrifugal chiller
Compressor type: piston chiller, screw chiller and centrifugal chiller
- Screw chiller
- Simple structure, less moving parts, less wearing parts, only 1/10 of piston type, low failure rate and long life.
- Smooth circular motion, no “surge” phenomenon during low load operation, low noise and low vibration.
- The compression ratio can be as high as 20, and the EER value is high.
- Convenient adjustment, stepless adjustment within the range of 10% to 100%, high efficiency at part load, and significant power saving.
- Small size and light weight, can be built into a fully enclosed large capacity unit.
- Not sensitive to wet stroke.
- It belongs to positive pressure operation, and there is no problem of external air intrusion and corrosion.
- The price is higher than the piston type.
- 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.
- The lubricating oil system is more complicated and consumes more oil.
- Large-capacity unit has higher noise than centrifugal type.
- High machining accuracy and assembly accuracy are required.
- Centrifugal chiller
- The impeller has high rotation speed, large gas transmission volume and large single machine capacity.
- Fewer wearing parts, reliable work, compact structure, stable operation, small vibration and low noise.
- The weight index per unit cooling capacity is small.
- No lubricant is mixed in the refrigerant, and the heat transfer performance of the evaporator and the condenser is good.
- The EER value is high and the theoretical value can be reached. 6.996. Easy adjustment, stepless adjustment within 10% ~ 100%.
- The single-stage compressor will appear “surge” phenomenon at low load and run smoothly at full load.
- Strict requirements on material strength, processing accuracy and manufacturing quality.
- 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.
- 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.
Read more, pls visit www.linkedin.com/in/gesonchiller