Collection! This is perhaps the most complete summary of the advantages and disadvantages of chillers

Collection! This is perhaps the most complete summary of the advantages and disadvantages of chillers

1. Piston chiller

　　 [China Refrigeration Network] Advantages:

　　 1. The materials are simple, common metal materials can be used, processing is easy, and the cost is low;

　　2. The system device is simple, easy to lubricate, no exhaust device is required;

　　3. Using multiple heads, high speed and multiple cylinders, performance can be improved.

　　 Disadvantages:

　　 1. There are many spare parts, many wearing parts, complicated and frequent maintenance, and high maintenance cost;

　　 2. The compression ratio is low, and the single cooling capacity is small;

　　3. Poor adjustment performance under partial load of single machine head, unloading adjustment can not be stepless adjustment;

　　4. It belongs to the up and down reciprocating motion, with large vibration;

　　 5. The weight index per unit cooling capacity is large.

Collection! This is perhaps the most complete summary of the advantages and disadvantages of chillers

　　 2. Screw chiller

　　 advantages:

　　 1. Simple structure, fewer moving parts, fewer wearing parts, only 1/10 of the piston type, low failure rate and long life;

　　2. Smooth circular motion, no "surging" 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. Convenient adjustment, stepless adjustment within the range of 10%~100%, high efficiency at part load, significant power saving

　　5. Small size, light weight, can be built as a fully enclosed large capacity unit;

　　 6. Not sensitive to wet stroke;

　　 7. It belongs to positive pressure operation, and there is no problem of external air intrusion and corrosion.

　　 Disadvantages:

　　 1. The price is higher than the piston type;

　　 2. The capacity of a single machine is smaller than that of the centrifugal type, and the speed is lower than that of the centrifugal type;

　　3. The lubricating oil system is more complicated and consumes a lot of fuel;

　　 4. Large-capacity unit has higher noise than centrifugal type;

　　 5. High processing precision and assembly precision are required.

Collection! This is perhaps the most complete summary of the advantages and disadvantages of chillers

　　 Three, centrifugal chiller

　　 advantages:

　　1. The impeller speed is high, the gas transmission volume is large, and the single machine capacity is large;

　　2. Few wearing parts, reliable work, compact structure, stable operation, low vibration and low noise;

　　3. The weight index of unit cooling capacity is small;

　　 4. There is no lubricating oil mixed in the refrigerant, and the heat transfer performance of the evaporator and condenser is good;

　　 5. The EER value is high, the theoretical value can reach 6.99;

　　 6. Convenient adjustment, stepless adjustment within 10%~100%.

　　 Disadvantages:

　　 1. Single-stage compressors will appear "surging" at low load, and run smoothly at full load;

　　2. Strict requirements on material strength, processing accuracy and manufacturing quality;

　　 3. When the operating conditions deviate from the design conditions, the efficiency drops faster, and the cooling capacity decreases faster than the piston type as the evaporation temperature decreases;

　　4. Centrifugal negative pressure system, external air is easy to invade, and there is a danger of chemical changes and corrosion of pipelines.

Collection! This is perhaps the most complete summary of the advantages and disadvantages of chillers

　　 Four, modular chiller

　　 advantages:

　　 1. It is an improved type of piston type and screw type, which is composed of multiple cold water units;

　　2. The unit is small in size, light in weight, low in height and small in area;

　　3. Simple installation, no need to reserve installation holes, convenient on-site assembly, especially suitable for renovation projects.

　　 Disadvantages:

　　 1. The price is more expensive;

　　 2. Generally, the number of modules should not exceed 8.

Collection! This is perhaps the most complete summary of the advantages and disadvantages of chillers

　　 5. Water source heat pump unit

　　 advantages:

　　1. Energy saving, heat can be recovered during operation in winter;

　　 2. Taken from nature;

　　3. Relatively high energy efficiency ratio;

　　 4. Easy installation and low maintenance cost;

　　 5. Flexible application and convenient adjustment.

　　 Disadvantages:

　　 1. Can not make maximum use of fresh air during the transition season;

　　 2. The unit is noisy.

Collection! This is perhaps the most complete summary of the advantages and disadvantages of chillers

　　 VI. Lithium bromide absorption chiller (steam, hot water and direct combustion type)

　　 advantages:

　　 1. Few moving parts, low failure rate, smooth movement, low vibration and low noise;

　　 2. The processing is simple, the operation is convenient, and it can realize 10%~100% stepless adjustment;

　　3. Lithium bromide solution is non-toxic and has no damaging effect on the ozone layer;

　　 4. Residual heat can be used. Waste heat and other low-grade heat energy;

　　5. Low operating cost and good safety;

　　6. ​​Using heat energy as the power, less electricity consumption.

　　 Disadvantages:

　　 1. The service life is shorter than the compression type;

　　 2. Saving electricity but not energy saving, large steam consumption, low thermal efficiency;

　　3. The unit has been operating under vacuum for a long time, and external air is easy to invade. If the air invades, the cooling capacity will be attenuated, so the requirements are strict; sealing will bring inconvenience to manufacturing and use;

　　4. The heat rejection load of the unit is larger than that of the compression type, which requires higher cooling water quality;

　　 5. Lithium bromide solution is strongly corrosive to carbon steel, affecting the life and performance of the unit.