Several types of refrigeration units
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There are many types of chillers, piston chillers, screw chillers, centrifugal chillers, modular chillers, water source heat pump units, lithium bromide absorption chillers (steam, hot water and direct fuel). Each type of freezer has its advantages and disadvantages, you can choose the type of chiller that you like for your needs.
Below Dongguan Tiande Machinery reminds you of the advantages and disadvantages of several chillers:
1. Piston industrial chiller
   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.
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 unit cooling capacity has a large weight index.
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 unit cooling capacity has a large weight index.
Second, screw industrial chiller
   advantage:
1. Simple structure, less moving parts, less wearing parts, only 1/10 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 used as an established 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.
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 used as an established 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 single unit capacity 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.
2. The single unit capacity 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.
Third, centrifugal industrial chiller
   advantage:
1. The impeller has high speed, large gas transmission volume and large single machine 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%.
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 and 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.
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.
Fourth, modular industrial chiller
   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 footprint;
3. Simple installation, no need to reserve installation holes, convenient on-site combination, especially suitable for renovation projects.
2. The unit is small in size, light in weight, low in height and small in footprint;
3. Simple installation, no need to reserve installation holes, 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 pieces.
2. The number of modules should not exceed 8 pieces.
5. Lithium bromide absorption industrial chillers (steam, hot water and direct combustion)
   advantage:
1. Less moving parts, low failure rate, smooth movement, low vibration and low noise;
2. Simple processing, convenient operation, can achieve 10%~100% stepless adjustment;
3. The lithium bromide solution is non-toxic and has no destructive effect on the ozone layer;
4. Available waste heat. Waste heat and other low grade heat energy;
5. Low operating costs and good security;
6. With heat as the power, less energy is used.
2. Simple processing, convenient operation, can achieve 10%~100% stepless adjustment;
3. The lithium bromide solution is non-toxic and has no destructive effect on the ozone layer;
4. Available waste heat. Waste heat and other low grade heat energy;
5. Low operating costs and good security;
6. With heat as the power, less energy is used.
   Disadvantages:
1. The service life is shorter than the compression type;
2. Power saving is not energy saving, large amount of steam consumption, and low thermal efficiency;
3. The unit is operated under vacuum for a long time, and the external air is easy to invade. If the air invades, the cooling capacity is attenuated, so strict sealing is required, which brings inconvenience to manufacturing and use;
4. The heat rejection load of the unit is larger than that of the compression type, and the water quality of the cooling water is relatively high;
5. Lithium bromide solution has strong corrosive effect on carbon steel, which affects unit life and performance.
2. Power saving is not energy saving, large amount of steam consumption, and low thermal efficiency;
3. The unit is operated under vacuum for a long time, and the external air is easy to invade. If the air invades, the cooling capacity is attenuated, so strict sealing is required, which brings inconvenience to manufacturing and use;
4. The heat rejection load of the unit is larger than that of the compression type, and the water quality of the cooling water is relatively high;
5. Lithium bromide solution has strong corrosive effect on carbon steel, which affects unit life and performance.
Sixth, water source heat pump unit
   advantage:
1. Energy saving, heat recovery during winter operation;
2. No need to refrigerate the machine room, do not have large ventilation pipes and circulating water pipes, can not keep warm, reduce the cost;
3. Easy to measure;
4. Easy installation and low maintenance costs;
5. Flexible application and convenient adjustment.
2. No need to refrigerate the machine room, do not have large ventilation pipes and circulating water pipes, can not keep warm, reduce the cost;
3. Easy to measure;
4. Easy installation and low maintenance costs;
5. Flexible application and convenient adjustment.
   Disadvantages:
1. In the excessive season, you cannot use the fresh air to a large extent;
2. The unit has a large noise;
3. Most of the units are concealed in the ceiling, which brings certain difficulties to the maintenance.
2. The unit has a large noise;
3. Most of the units are concealed in the ceiling, which brings certain difficulties to the maintenance.
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