How to Choose Between Scroll and Turbine Compressors?

As the cooling capacity range with the largest volume of commercial air conditioning compressor bodies, the market competition for 3-7HP air conditioning compressors is also the most intense. At present, 3-7HP air conditioning compressors are mainly used in segmented fields such as unit machines, household multi-connected machines, and household water machines.

Now let's take a look at the respective advantages, disadvantages, and choices of rotary compressors and scroll compressors.
Selection of rotary compressors and scroll compressors
In terms of commercial air conditioners themselves, the two types of compressors have their own advantages and disadvantages.

In configurations within 3-7HP, the twin-rotor compressor has an advantage over the scroll compressor. For those above 8 horsepower, the scroll compressor is more advantageous to consider. The advantage of the twin-rotor compressor lies in low frequencies, and the advantage of the scroll compressor lies in high frequencies.
To put it simply, if the air conditioning configuration requires all indoor unit air vents to be fully open, then the scroll compressor has a greater advantage. If the configuration of the central air conditioner is based on actual applications and not all indoor unit air vents will be used, then the twin-rotor compressor is more energy-efficient.

This is why in high-power air conditioning systems, especially in large-horsepower outdoor units for commercial use, scroll compressors are more commonly used, while in low-power outdoor units, especially those of 8 horsepower or less, twin-rotor compressors are more common.
For example, we can compare the compressor to the operation of a car. If it is always running at a speed of 120 kilometers or more on the highway, then the scroll compressor is more efficient. In the city, where the road conditions are not good and there are constant starts and stops, and the speed cannot exceed 80 kilometers. Instead, the twin-rotor compressor is more efficient.
Twin-rotor and scroll compressors are connected in the same way, and we need to distinguish their performances. The rated minimum start of a twin-rotor compressor is 0.68-0.78 horsepower. For scroll compressors, it is 1/3. That is to say, for example, if the outdoor unit is 6 horsepower. If there is only one room in the house and a 1-horsepower air conditioner is used, then 1 horsepower will be continuously wasted because the rated starting horsepower is 2 horsepower.
For twin-rotor compressors used in 3-7HP and below, scroll compressors are suitable for above 7HP. If it reaches 18 horsepower, the scroll compressor needs to use a dual-module, that is, two compressors, while the twin-rotor compressor needs to use three compressor modules. We can understand that as the core component of central air conditioning, the compressor accounts for a very large proportion of the cost. When it is within 6 horsepower, everyone has a single compressor and the cost difference is not large.

When it is between 6 and 18 horsepower, the number of twin-rotor compressors increases and the cost increases.