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  • Writer's pictureKai Zhang

Choose Screw Chillers or Centrifugal Chillers?

1. Structure and Work Principle:

The screw chiller is composed of a compressor, a condenser, an evaporator, a throttle valve, etc. Among them, the screw compressor is its core component, which is composed of two screws tightly coupled. The screw runs inside to create high-pressure air, which releases heat after entering the condenser and discharges high-temperature and high-pressure steam. Then the steam flows into the throttle valve, reduces the pressure and passes through the evaporator. It absorbs heat and cools down, becomes low-temperature and low-pressure steam and returns to the compressor. The cycle is compressed again to form cold water.



The centrifugal chiller is composed of a motor, a centrifugal compressor, a condenser, an evaporator, etc. The centrifugal compressor has a fast speed, and the high-speed rotation drives the air to increase the temperature and pressure, generating high-temperature and high-pressure steam. Then it enters the condenser, releases heat, and forms a high-temperature and high-pressure liquid. Then it passes through the throttling device and flows to the evaporator. It becomes a low-temperature and low-pressure liquid through decompression and heat absorption, and returns to the centrifugal compressor for cyclic compression.



2. Advantages and Disadvantages:

The amount of steam generated in the evaporator of the screw chiller is large, and the heat dissipation area is also large, which makes the cooling effect better. Its cooling capacity and energy efficiency ratio can be guaranteed. At the same time, it has low noise, low vibration, easy installation, and low requirements for equipment, but the cost is high, and it is generally suitable for large commercial buildings.


Centrifugal chillers have higher cooling efficiency when the cooling capacity is large, and are suitable for high-rise buildings and large places such as large shopping malls. It has the characteristics of flexible installation and convenient maintenance. At the same time, centrifugal chillers have disadvantages such as large starting current and high noise, and generally need to be equipped with vibration damping and silencers.


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3. Scope of Application:

Screw chillers are mainly suitable for large commercial buildings, factories, power plants, chemical plants, steel structure manufacturing plants and other large places.


Centrifugal chillers are suitable for commercial office buildings, large shopping malls, high-end residential compounds, etc.


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How to Choose?

After reading the above article, I believe you will have an idea. We suggest you to choose a suitable chiller according to actual needs. Both screw chillers and centrifugal chillers are commonly used chillers. There are great differences between the two in terms of structure, working principle, and scope of application. Generally speaking, screw chillers are suitable for large venues, with relatively more stable cooling capacity and energy efficiency ratio, and higher costs; centrifugal chillers are suitable for relatively small-scale office buildings and shopping malls, with high energy efficiency ratio, but relatively high noise and vibration requirements.


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