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Detailed classification of chiller and summary of advantages and disadvantages


There are many titles of chiller in the industry, including chiller, industrial chiller, screw chiller, air-cooled water chiller, water-cooled chiller, water-cooled chiller, air-cooled chiller, etc In fact, the titles are all included in the chiller, and the main function of the chiller is refrigeration, which controls the temperature of the water to provide the cooling temperature and cooling effect required by different materials. Let us recognize the very detailed classification below:

First, the classification of chiller

1. Cooling method by condenser: water-cooled chiller, air-cooled water chiller

2, according to the cold water outlet temperature: air-conditioning type (7 degrees, 10 degrees, 13 degrees, 15 degrees), low temperature type (-5 degrees to -30 degrees)

3. Divided by compressor: piston chiller, screw chiller, centrifugal chiller

4. By fuel type: fuel type (diesel, heavy oil), gas type (kerosene, natural gas)

5. According to the form of energy utilization: single-cooled heat pump type, heat recovery type single-cooled, ice-storage dual-function type

6. According to the sealing method: open, semi-closed, fully closed

7. By refrigerant: water-cooled chiller, brine chiller, glycol chiller

8. Divided according to energy compensation: power compensation (compression type), thermal energy compensation (absorption type)

9. According to the refrigerant: R22, R123, R134a

10, according to the heat source (absorption): hot water type, steam type, direct combustion type

Advantages and disadvantages of various chiller

1.Screw chiller

Advantages: simple structure, fewer moving parts, less wearing parts, only 1/10 of the piston type, low failure rate, long life; smooth circular motion, no "surge" phenomenon during low load operation, low noise and small vibration ; Compression ratio can be as high as 20, high EER value; easy to adjust, can be steplessly adjusted in the range of 10% to 100%, high efficiency at part load, significant power saving; small size, light weight, can be built fully enclosed Large-capacity unit; not sensitive to wet stroke; positive pressure operation, no external air intrusion and corrosion problems

Disadvantages: the price is higher than the piston type; the capacity of the single machine 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 the fuel consumption is large; 4. the noise of the large-capacity unit is higher than the centrifugal type; high

2.Centrifugal chiller

Advantages: high impeller speed, large gas transmission capacity, large single machine capacity; few wearing parts, reliable work, compact structure, stable operation, low vibration and low noise; small weight index per unit cooling capacity; no refrigerant mixed with lubricant The heat transfer performance of the evaporator and condenser is good 5. The EER value is high and the theoretical value can reach 6.996. Easy to adjust, stepless adjustment can be performed within 10% ~ 100%

Disadvantages: Single-stage compressors will experience "surge" at low load and run smoothly at full load; strict requirements for material strength, processing accuracy and manufacturing quality; when the operating conditions deviate from the design conditions, the efficiency decreases quickly, The cooling capacity decreases faster than the piston type with the decrease of the evaporation temperature; the centrifugal negative pressure system, the external air is easy to invade, and there is a risk of chemical changes to corrode the pipeline

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

Advantages: few moving parts, low failure rate, stable movement, small vibration, low noise; simple processing and easy operation, which can achieve 10% ~ 100% stepless adjustment; lithium bromide solution is non-toxic and has no damaging effect on the ozone layer; waste heat can be used . Waste heat and other low-grade thermal energy; low operating cost and good safety; using thermal energy as power, and less electricity consumption

Disadvantages: shorter service life than compression type; energy saving does not save energy, large steam consumption, low thermal efficiency; the unit runs under vacuum for a long time, the outside air is easy to invade, if the air invades, causing the cooling capacity attenuation, strict sealing is required, and manufacturing Inconvenience and use 4. The unit's exhaust heat load is larger than the compression type, which requires higher cooling water quality 5. The lithium bromide solution is strongly corrosive to carbon steel, affecting the unit life and performance

4.Modular chiller

Advantages: It is an improved type of piston chiller and screw chiller. It is a combination of multiple chiller units. The unit is small in size, light in weight, low in height and small in area. It is simple to install and does not require installation holes. Easy on-site assembly, especially suitable for retrofit projects

Disadvantages: the price is more expensive; the number of modules should generally not exceed 8



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