Advantage:
1. The material is simple, the general metal material can be used, the processing is easy, and the cost is low;
2. The system device is simple, easy to lubricate, and does not require an exhaust device;
3. With multi-head, high-speed multi-cylinder, performance can be improved.

Disadvantages:
1. Many parts, more wearing parts, complicated maintenance, frequent, high maintenance costs;
2. The compression ratio is low, and the cooling capacity of the single machine is small;
3. The adjustment performance of the single head part under partial load is poor, the cylinder is adjusted, and it cannot be adjusted steplessly;
4. It is a reciprocating movement up and down, and the vibration is large

5. The rated cooling capacity has a large weight index.

Advantage:
1. Simple structure, less moving parts, less wearing parts.(only 10 percent of the piston type), low failure rate and long service life;
2. The circular motion is stable, there is 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. It is convenient to adjust, can be steplessly adjusted within the range of 10%~100%, high efficiency at partial load, and significant power saving;
5. Small size and light weight, it can be made as a stand type fully enclosed large capacity unit;
6. Not sensitive to wet strokes;
7. It is a positive pressure operation, and there is no problem of intrusion of outside air.

Disadvantages:
1. The price is higher than the piston type;
2. The capacity of single unit  is smaller than the centrifugal type, and the rotation speed is lower than the centrifugal type;
3. The lubricating oil system is more complicated and consumes a lot of fuel;
4. Large-capacity unit noise is higher than centrifugal type;
5. Requires high machining accuracy and assembly accuracy.

Advantage:
1. The impeller has high speed, large gas transmission volume and single machine has large capacity;
2. Less wearing parts, reliable work, compact structure, stable operation, low vibration and low noise;
3. The unit cooling capacity weight index is small;
4. The lubricating oil is not 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 reach 6.99.
6. Easy to adjust, stepless adjustment within 10%~100%.

Disadvantages:
1. The single-stage compressor will have a "surge" phenomenon at low load, but run smoothly at full load;
2. Strict requirements for material strength, processing accuracy and manufacturing quality;
3. When the operating condition deviates from the design working condition, the efficiency decreases rapidly, and the cooling capacity decreases with the evaporation temperature and decreases faster than the piston type;
4. Centrifugal negative pressure system, the outside air is easy to invade, there is a danger of chemically changing the corrosion pipeline.

Advantage:
1. It is a modified type of piston type and screw type, which is composed of a plurality of cold water units;
2. The unit is small in size, light in weight, low in height and small in area;
3. Easy to install, no need to reserve holes for installation, convenient on-site combination, especially suitable for renovation projects.
Disadvantages:
1. The price is more expensive;
2. The number of modules should not exceed 8 units.

Advantage:
1. Energy saving, heat recovery during winter operation;
2. Take the source of nature;
3. The energy efficiency ratio is relatively high;
4. Easy installation and low maintenance costs;
5. Flexible application and convenient adjustment.
Disadvantages:
1. In the excessive season, you cannot limit the use of fresh air;
2. The unit is noisy.

Contac Us:

Nataly Zhang

Email: nataly@hstars.com.cn

Phone: +8615812439313